content/renderer/accessibility/blink_ax_tree_source.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "content/renderer/accessibility/blink_ax_tree_source.h"
   6
   7 #include <set>
   8
   9 #include "base/strings/string_number_conversions.h"
  10 #include "base/strings/string_util.h"
  11 #include "base/strings/utf_string_conversions.h"
  12 #include "content/renderer/accessibility/blink_ax_enum_conversion.h"
  13 #include "content/renderer/browser_plugin/browser_plugin.h"
  14 #include "content/renderer/render_frame_impl.h"
  15 #include "content/renderer/render_frame_proxy.h"
  16 #include "content/renderer/render_view_impl.h"
  17 #include "third_party/WebKit/public/platform/WebRect.h"
  18 #include "third_party/WebKit/public/platform/WebSize.h"
  19 #include "third_party/WebKit/public/platform/WebString.h"
  20 #include "third_party/WebKit/public/platform/WebVector.h"
  21 #include "third_party/WebKit/public/web/WebAXEnums.h"
  22 #include "third_party/WebKit/public/web/WebAXObject.h"
  23 #include "third_party/WebKit/public/web/WebDocument.h"
  24 #include "third_party/WebKit/public/web/WebDocumentType.h"
  25 #include "third_party/WebKit/public/web/WebElement.h"
  26 #include "third_party/WebKit/public/web/WebFormControlElement.h"
  27 #include "third_party/WebKit/public/web/WebFrame.h"
  28 #include "third_party/WebKit/public/web/WebLocalFrame.h"
  29 #include "third_party/WebKit/public/web/WebNode.h"
  30 #include "third_party/WebKit/public/web/WebPlugin.h"
  31 #include "third_party/WebKit/public/web/WebPluginContainer.h"
  32 #include "third_party/WebKit/public/web/WebView.h"
  33
  34 using base::ASCIIToUTF16;
  35 using base::UTF16ToUTF8;
  36 using blink::WebAXObject;
  37 using blink::WebDocument;
  38 using blink::WebDocumentType;
  39 using blink::WebElement;
  40 using blink::WebLocalFrame;
  41 using blink::WebNode;
  42 using blink::WebPlugin;
  43 using blink::WebPluginContainer;
  44 using blink::WebVector;
  45 using blink::WebView;
  46
  47 namespace content {
  48
  49 namespace {
  50
  51 // Returns true if |ancestor| is the first unignored parent of |child|,
  52 // which means that when walking up the parent chain from |child|,
  53 // |ancestor| is the *first* ancestor that isn't marked as
  54 // accessibilityIsIgnored().
  55 bool IsParentUnignoredOf(WebAXObject ancestor,
  56                          WebAXObject child) {
  57   WebAXObject parent = child.parentObject();
  58   while (!parent.isDetached() && parent.accessibilityIsIgnored())
  59     parent = parent.parentObject();
  60   return parent.equals(ancestor);
  61 }
  62
  63 std::string GetEquivalentAriaRoleString(const ui::AXRole role) {
  64   switch (role) {
  65     case ui::AX_ROLE_ARTICLE:
  66       return "article";
  67     case ui::AX_ROLE_BANNER:
  68       return "banner";
  69     case ui::AX_ROLE_BUTTON:
  70       return "button";
  71     case ui::AX_ROLE_COMPLEMENTARY:
  72       return "complementary";
  73     case ui::AX_ROLE_FIGURE:
  74       return "figure";
  75     case ui::AX_ROLE_FOOTER:
  76       return "contentinfo";
  77     case ui::AX_ROLE_HEADING:
  78       return "heading";
  79     case ui::AX_ROLE_IMAGE:
  80       return "img";
  81     case ui::AX_ROLE_MAIN:
  82       return "main";
  83     case ui::AX_ROLE_NAVIGATION:
  84       return "navigation";
  85     case ui::AX_ROLE_RADIO_BUTTON:
  86       return "radio";
  87     case ui::AX_ROLE_REGION:
  88       return "region";
  89     case ui::AX_ROLE_SLIDER:
  90       return "slider";
  91     default:
  92       break;
  93   }
  94
  95   return std::string();
  96 }
  97
  98 void AddIntListAttributeFromWebObjects(ui::AXIntListAttribute attr,
  99                                        WebVector<WebAXObject> objects,
 100                                        ui::AXNodeData* dst) {
 101   std::vector<int32> ids;
 102   for(size_t i = 0; i < objects.size(); i++)
 103     ids.push_back(objects[i].axID());
 104   if (ids.size() > 0)
 105     dst->AddIntListAttribute(attr, ids);
 106 }
 107
 108 }  // Anonymous namespace
 109
 110 BlinkAXTreeSource::BlinkAXTreeSource(RenderFrameImpl* render_frame)
 111     : render_frame_(render_frame),
 112       node_to_frame_routing_id_map_(NULL),
 113       node_to_browser_plugin_instance_id_map_(NULL),
 114       accessibility_focus_id_(-1) {
 115 }
 116
 117 BlinkAXTreeSource::~BlinkAXTreeSource() {
 118 }
 119
 120 bool BlinkAXTreeSource::IsInTree(blink::WebAXObject node) const {
 121   const blink::WebAXObject& root = GetRoot();
 122   while (IsValid(node)) {
 123     if (node.equals(root))
 124       return true;
 125     node = GetParent(node);
 126   }
 127   return false;
 128 }
 129
 130 void BlinkAXTreeSource::CollectChildFrameIdMapping(
 131     std::map<int32, int>* node_to_frame_routing_id_map,
 132     std::map<int32, int>* node_to_browser_plugin_instance_id_map) {
 133   node_to_frame_routing_id_map_ = node_to_frame_routing_id_map;
 134   node_to_browser_plugin_instance_id_map_ =
 135       node_to_browser_plugin_instance_id_map;
 136 }
 137
 138 blink::WebAXObject BlinkAXTreeSource::GetRoot() const {
 139   return GetMainDocument().accessibilityObject();
 140 }
 141
 142 blink::WebAXObject BlinkAXTreeSource::GetFromId(int32 id) const {
 143   return GetMainDocument().accessibilityObjectFromID(id);
 144 }
 145
 146 int32 BlinkAXTreeSource::GetId(blink::WebAXObject node) const {
 147   return node.axID();
 148 }
 149
 150 void BlinkAXTreeSource::GetChildren(
 151     blink::WebAXObject parent,
 152     std::vector<blink::WebAXObject>* out_children) const {
 153   if (parent.role() == blink::WebAXRoleStaticText) {
 154     blink::WebAXObject ancestor = parent;
 155     while (!ancestor.isDetached()) {
 156       if (ancestor.axID() == accessibility_focus_id_) {
 157         parent.loadInlineTextBoxes();
 158         break;
 159       }
 160       ancestor = ancestor.parentObject();
 161     }
 162   }
 163
 164   bool is_iframe = false;
 165   WebNode node = parent.node();
 166   if (!node.isNull() && node.isElementNode()) {
 167     WebElement element = node.to<WebElement>();
 168     is_iframe = (element.tagName() == ASCIIToUTF16("IFRAME"));
 169   }
 170
 171   for (unsigned i = 0; i < parent.childCount(); i++) {
 172     blink::WebAXObject child = parent.childAt(i);
 173
 174     // The child may be invalid due to issues in blink accessibility code.
 175     if (child.isDetached())
 176       continue;
 177
 178     // Skip children whose parent isn't |parent|.
 179     // As an exception, include children of an iframe element.
 180     if (!is_iframe && !IsParentUnignoredOf(parent, child))
 181       continue;
 182
 183     out_children->push_back(child);
 184   }
 185 }
 186
 187 blink::WebAXObject BlinkAXTreeSource::GetParent(
 188     blink::WebAXObject node) const {
 189   // Blink returns ignored objects when walking up the parent chain,
 190   // we have to skip those here. Also, stop when we get to the root
 191   // element.
 192   blink::WebAXObject root = GetRoot();
 193   do {
 194     if (node.equals(root))
 195       return blink::WebAXObject();
 196     node = node.parentObject();
 197   } while (!node.isDetached() && node.accessibilityIsIgnored());
 198
 199   return node;
 200 }
 201
 202 bool BlinkAXTreeSource::IsValid(blink::WebAXObject node) const {
 203   return !node.isDetached();  // This also checks if it's null.
 204 }
 205
 206 bool BlinkAXTreeSource::IsEqual(blink::WebAXObject node1,
 207                                 blink::WebAXObject node2) const {
 208   return node1.equals(node2);
 209 }
 210
 211 blink::WebAXObject BlinkAXTreeSource::GetNull() const {
 212   return blink::WebAXObject();
 213 }
 214
 215 void BlinkAXTreeSource::SerializeNode(blink::WebAXObject src,
 216                                       ui::AXNodeData* dst) const {
 217   dst->role = AXRoleFromBlink(src.role());
 218   dst->state = AXStateFromBlink(src);
 219   dst->location = src.boundingBoxRect();
 220   dst->id = src.axID();
 221   std::string name = UTF16ToUTF8(src.title());
 222
 223   std::string value;
 224   if (src.valueDescription().length()) {
 225     dst->AddStringAttribute(ui::AX_ATTR_VALUE,
 226                             UTF16ToUTF8(src.valueDescription()));
 227   } else {
 228     dst->AddStringAttribute(ui::AX_ATTR_VALUE, UTF16ToUTF8(src.stringValue()));
 229   }
 230
 231   if (dst->role == ui::AX_ROLE_COLOR_WELL) {
 232     int r, g, b;
 233     src.colorValue(r, g, b);
 234     dst->AddIntAttribute(ui::AX_ATTR_COLOR_VALUE_RED, r);
 235     dst->AddIntAttribute(ui::AX_ATTR_COLOR_VALUE_GREEN, g);
 236     dst->AddIntAttribute(ui::AX_ATTR_COLOR_VALUE_BLUE, b);
 237   }
 238
 239   if (dst->role == ui::AX_ROLE_INLINE_TEXT_BOX) {
 240     dst->AddIntAttribute(ui::AX_ATTR_TEXT_DIRECTION,
 241                          AXTextDirectionFromBlink(src.textDirection()));
 242
 243     WebVector<int> src_character_offsets;
 244     src.characterOffsets(src_character_offsets);
 245     std::vector<int32> character_offsets;
 246     character_offsets.reserve(src_character_offsets.size());
 247     for (size_t i = 0; i < src_character_offsets.size(); ++i)
 248       character_offsets.push_back(src_character_offsets[i]);
 249     dst->AddIntListAttribute(ui::AX_ATTR_CHARACTER_OFFSETS, character_offsets);
 250
 251     WebVector<int> src_word_starts;
 252     WebVector<int> src_word_ends;
 253     src.wordBoundaries(src_word_starts, src_word_ends);
 254     std::vector<int32> word_starts;
 255     std::vector<int32> word_ends;
 256     word_starts.reserve(src_word_starts.size());
 257     word_ends.reserve(src_word_starts.size());
 258     for (size_t i = 0; i < src_word_starts.size(); ++i) {
 259       word_starts.push_back(src_word_starts[i]);
 260       word_ends.push_back(src_word_ends[i]);
 261     }
 262     dst->AddIntListAttribute(ui::AX_ATTR_WORD_STARTS, word_starts);
 263     dst->AddIntListAttribute(ui::AX_ATTR_WORD_ENDS, word_ends);
 264   }
 265
 266   if (src.accessKey().length()) {
 267     dst->AddStringAttribute(ui::AX_ATTR_ACCESS_KEY,
 268     UTF16ToUTF8(src.accessKey()));
 269   }
 270   if (src.actionVerb().length())
 271     dst->AddStringAttribute(ui::AX_ATTR_ACTION, UTF16ToUTF8(src.actionVerb()));
 272   if (src.ariaAutoComplete().length())
 273     dst->AddStringAttribute(ui::AX_ATTR_AUTO_COMPLETE,
 274                             UTF16ToUTF8(src.ariaAutoComplete()));
 275   if (src.isAriaReadOnly())
 276     dst->AddBoolAttribute(ui::AX_ATTR_ARIA_READONLY, true);
 277   if (src.isButtonStateMixed())
 278     dst->AddBoolAttribute(ui::AX_ATTR_BUTTON_MIXED, true);
 279   if (src.canSetValueAttribute())
 280     dst->AddBoolAttribute(ui::AX_ATTR_CAN_SET_VALUE, true);
 281   if (src.accessibilityDescription().length()) {
 282     dst->AddStringAttribute(ui::AX_ATTR_DESCRIPTION,
 283                             UTF16ToUTF8(src.accessibilityDescription()));
 284   }
 285   if (src.hasComputedStyle()) {
 286     dst->AddStringAttribute(ui::AX_ATTR_DISPLAY,
 287                             UTF16ToUTF8(src.computedStyleDisplay()));
 288   }
 289   if (src.helpText().length())
 290     dst->AddStringAttribute(ui::AX_ATTR_HELP, UTF16ToUTF8(src.helpText()));
 291   if (src.keyboardShortcut().length()) {
 292     dst->AddStringAttribute(ui::AX_ATTR_SHORTCUT,
 293                             UTF16ToUTF8(src.keyboardShortcut()));
 294   }
 295   if (!src.titleUIElement().isDetached()) {
 296     dst->AddIntAttribute(ui::AX_ATTR_TITLE_UI_ELEMENT,
 297                          src.titleUIElement().axID());
 298   }
 299   if (!src.ariaActiveDescendant().isDetached()) {
 300     dst->AddIntAttribute(ui::AX_ATTR_ACTIVEDESCENDANT_ID,
 301                          src.ariaActiveDescendant().axID());
 302   }
 303
 304   if (!src.url().isEmpty())
 305     dst->AddStringAttribute(ui::AX_ATTR_URL, src.url().spec());
 306
 307   if (dst->role == ui::AX_ROLE_HEADING)
 308     dst->AddIntAttribute(ui::AX_ATTR_HIERARCHICAL_LEVEL, src.headingLevel());
 309   else if ((dst->role == ui::AX_ROLE_TREE_ITEM ||
 310             dst->role == ui::AX_ROLE_ROW) &&
 311            src.hierarchicalLevel() > 0) {
 312     dst->AddIntAttribute(ui::AX_ATTR_HIERARCHICAL_LEVEL,
 313                          src.hierarchicalLevel());
 314   }
 315
 316   // Treat the active list box item as focused.
 317   if (dst->role == ui::AX_ROLE_LIST_BOX_OPTION &&
 318       src.isSelectedOptionActive()) {
 319     dst->state |= (1 << ui::AX_STATE_FOCUSED);
 320   }
 321
 322   if (src.canvasHasFallbackContent())
 323     dst->AddBoolAttribute(ui::AX_ATTR_CANVAS_HAS_FALLBACK, true);
 324
 325   WebNode node = src.node();
 326   bool is_iframe = false;
 327
 328   if (!node.isNull() && node.isElementNode()) {
 329     WebElement element = node.to<WebElement>();
 330     is_iframe = (element.tagName() == ASCIIToUTF16("IFRAME"));
 331
 332     // TODO(ctguil): The tagName in WebKit is lower cased but
 333     // HTMLElement::nodeName calls localNameUpper. Consider adding
 334     // a WebElement method that returns the original lower cased tagName.
 335     dst->AddStringAttribute(
 336         ui::AX_ATTR_HTML_TAG,
 337         base::StringToLowerASCII(UTF16ToUTF8(element.tagName())));
 338     for (unsigned i = 0; i < element.attributeCount(); ++i) {
 339       std::string name = base::StringToLowerASCII(UTF16ToUTF8(
 340           element.attributeLocalName(i)));
 341       std::string value = UTF16ToUTF8(element.attributeValue(i));
 342       dst->html_attributes.push_back(std::make_pair(name, value));
 343     }
 344
 345     if (dst->role == ui::AX_ROLE_TEXT_AREA ||
 346         dst->role == ui::AX_ROLE_TEXT_FIELD) {
 347       dst->AddIntAttribute(ui::AX_ATTR_TEXT_SEL_START, src.selectionStart());
 348       dst->AddIntAttribute(ui::AX_ATTR_TEXT_SEL_END, src.selectionEnd());
 349
 350       WebVector<int> src_line_breaks;
 351       src.lineBreaks(src_line_breaks);
 352       if (src_line_breaks.size() > 0) {
 353         std::vector<int32> line_breaks;
 354         line_breaks.reserve(src_line_breaks.size());
 355         for (size_t i = 0; i < src_line_breaks.size(); ++i)
 356           line_breaks.push_back(src_line_breaks[i]);
 357         dst->AddIntListAttribute(ui::AX_ATTR_LINE_BREAKS, line_breaks);
 358       }
 359
 360       if (dst->role == ui::AX_ROLE_TEXT_FIELD &&
 361           src.textInputType().length()) {
 362         dst->AddStringAttribute(ui::AX_ATTR_TEXT_INPUT_TYPE,
 363                                 UTF16ToUTF8(src.textInputType()));
 364       }
 365     }
 366
 367     // ARIA role.
 368     if (element.hasAttribute("role")) {
 369       dst->AddStringAttribute(ui::AX_ATTR_ROLE,
 370                               UTF16ToUTF8(element.getAttribute("role")));
 371     } else {
 372       std::string role = GetEquivalentAriaRoleString(dst->role);
 373       if (!role.empty())
 374         dst->AddStringAttribute(ui::AX_ATTR_ROLE, role);
 375     }
 376
 377     // Browser plugin (used in a <webview>).
 378     if (node_to_browser_plugin_instance_id_map_) {
 379       BrowserPlugin* browser_plugin = BrowserPlugin::GetFromNode(element);
 380       if (browser_plugin) {
 381         (*node_to_browser_plugin_instance_id_map_)[dst->id] =
 382             browser_plugin->browser_plugin_instance_id();
 383         dst->AddBoolAttribute(ui::AX_ATTR_IS_AX_TREE_HOST, true);
 384       }
 385     }
 386   }
 387
 388   if (src.isInLiveRegion()) {
 389     dst->AddBoolAttribute(ui::AX_ATTR_LIVE_ATOMIC, src.liveRegionAtomic());
 390     dst->AddBoolAttribute(ui::AX_ATTR_LIVE_BUSY, src.liveRegionBusy());
 391     if (src.liveRegionBusy())
 392       dst->state |= (1 << ui::AX_STATE_BUSY);
 393     if (!src.liveRegionStatus().isEmpty()) {
 394       dst->AddStringAttribute(ui::AX_ATTR_LIVE_STATUS,
 395                               UTF16ToUTF8(src.liveRegionStatus()));
 396     }
 397     dst->AddStringAttribute(ui::AX_ATTR_LIVE_RELEVANT,
 398                             UTF16ToUTF8(src.liveRegionRelevant()));
 399     dst->AddBoolAttribute(ui::AX_ATTR_CONTAINER_LIVE_ATOMIC,
 400                           src.containerLiveRegionAtomic());
 401     dst->AddBoolAttribute(ui::AX_ATTR_CONTAINER_LIVE_BUSY,
 402                           src.containerLiveRegionBusy());
 403     dst->AddStringAttribute(ui::AX_ATTR_CONTAINER_LIVE_STATUS,
 404                             UTF16ToUTF8(src.containerLiveRegionStatus()));
 405     dst->AddStringAttribute(ui::AX_ATTR_CONTAINER_LIVE_RELEVANT,
 406                             UTF16ToUTF8(src.containerLiveRegionRelevant()));
 407   }
 408
 409   if (dst->role == ui::AX_ROLE_PROGRESS_INDICATOR ||
 410       dst->role == ui::AX_ROLE_SCROLL_BAR ||
 411       dst->role == ui::AX_ROLE_SLIDER ||
 412       dst->role == ui::AX_ROLE_SPIN_BUTTON) {
 413     dst->AddFloatAttribute(ui::AX_ATTR_VALUE_FOR_RANGE, src.valueForRange());
 414     dst->AddFloatAttribute(ui::AX_ATTR_MAX_VALUE_FOR_RANGE,
 415                            src.maxValueForRange());
 416     dst->AddFloatAttribute(ui::AX_ATTR_MIN_VALUE_FOR_RANGE,
 417                            src.minValueForRange());
 418   }
 419
 420   if (dst->role == ui::AX_ROLE_DOCUMENT ||
 421       dst->role == ui::AX_ROLE_WEB_AREA) {
 422     dst->AddStringAttribute(ui::AX_ATTR_HTML_TAG, "#document");
 423     const WebDocument& document = src.document();
 424     if (name.empty())
 425       name = UTF16ToUTF8(document.title());
 426     dst->AddStringAttribute(ui::AX_ATTR_DOC_TITLE,
 427                             UTF16ToUTF8(document.title()));
 428     dst->AddStringAttribute(ui::AX_ATTR_DOC_URL, document.url().spec());
 429     dst->AddStringAttribute(
 430         ui::AX_ATTR_DOC_MIMETYPE,
 431         document.isXHTMLDocument() ? "text/xhtml" : "text/html");
 432     dst->AddBoolAttribute(ui::AX_ATTR_DOC_LOADED, src.isLoaded());
 433     dst->AddFloatAttribute(ui::AX_ATTR_DOC_LOADING_PROGRESS,
 434                            src.estimatedLoadingProgress());
 435
 436     const WebDocumentType& doctype = document.doctype();
 437     if (!doctype.isNull()) {
 438       dst->AddStringAttribute(ui::AX_ATTR_DOC_DOCTYPE,
 439                               UTF16ToUTF8(doctype.name()));
 440     }
 441
 442     const gfx::Size& scroll_offset = document.scrollOffset();
 443     dst->AddIntAttribute(ui::AX_ATTR_SCROLL_X, scroll_offset.width());
 444     dst->AddIntAttribute(ui::AX_ATTR_SCROLL_Y, scroll_offset.height());
 445
 446     const gfx::Size& min_offset = document.minimumScrollOffset();
 447     dst->AddIntAttribute(ui::AX_ATTR_SCROLL_X_MIN, min_offset.width());
 448     dst->AddIntAttribute(ui::AX_ATTR_SCROLL_Y_MIN, min_offset.height());
 449
 450     const gfx::Size& max_offset = document.maximumScrollOffset();
 451     dst->AddIntAttribute(ui::AX_ATTR_SCROLL_X_MAX, max_offset.width());
 452     dst->AddIntAttribute(ui::AX_ATTR_SCROLL_Y_MAX, max_offset.height());
 453
 454     if (node_to_frame_routing_id_map_ && !src.equals(GetRoot())) {
 455       WebLocalFrame* frame = document.frame();
 456       RenderFrameImpl* render_frame = RenderFrameImpl::FromWebFrame(frame);
 457       if (render_frame) {
 458         (*node_to_frame_routing_id_map_)[dst->id] =
 459             render_frame->GetRoutingID();
 460         dst->AddBoolAttribute(ui::AX_ATTR_IS_AX_TREE_HOST, true);
 461       } else {
 462         RenderFrameProxy* render_frame_proxy =
 463             RenderFrameProxy::FromWebFrame(frame);
 464         if (render_frame_proxy) {
 465           (*node_to_frame_routing_id_map_)[dst->id] =
 466               render_frame_proxy->routing_id();
 467           dst->AddBoolAttribute(ui::AX_ATTR_IS_AX_TREE_HOST, true);
 468         }
 469       }
 470     }
 471   }
 472
 473   if (dst->role == ui::AX_ROLE_TABLE) {
 474     int column_count = src.columnCount();
 475     int row_count = src.rowCount();
 476     if (column_count > 0 && row_count > 0) {
 477       std::set<int32> unique_cell_id_set;
 478       std::vector<int32> cell_ids;
 479       std::vector<int32> unique_cell_ids;
 480       dst->AddIntAttribute(ui::AX_ATTR_TABLE_COLUMN_COUNT, column_count);
 481       dst->AddIntAttribute(ui::AX_ATTR_TABLE_ROW_COUNT, row_count);
 482       WebAXObject header = src.headerContainerObject();
 483       if (!header.isDetached())
 484         dst->AddIntAttribute(ui::AX_ATTR_TABLE_HEADER_ID, header.axID());
 485       for (int i = 0; i < column_count * row_count; ++i) {
 486         WebAXObject cell = src.cellForColumnAndRow(
 487             i % column_count, i / column_count);
 488         int cell_id = -1;
 489         if (!cell.isDetached()) {
 490           cell_id = cell.axID();
 491           if (unique_cell_id_set.find(cell_id) == unique_cell_id_set.end()) {
 492             unique_cell_id_set.insert(cell_id);
 493             unique_cell_ids.push_back(cell_id);
 494           }
 495         }
 496         cell_ids.push_back(cell_id);
 497       }
 498       dst->AddIntListAttribute(ui::AX_ATTR_CELL_IDS, cell_ids);
 499       dst->AddIntListAttribute(ui::AX_ATTR_UNIQUE_CELL_IDS, unique_cell_ids);
 500     }
 501   }
 502
 503   if (dst->role == ui::AX_ROLE_ROW) {
 504     dst->AddIntAttribute(ui::AX_ATTR_TABLE_ROW_INDEX, src.rowIndex());
 505     WebAXObject header = src.rowHeader();
 506     if (!header.isDetached())
 507       dst->AddIntAttribute(ui::AX_ATTR_TABLE_ROW_HEADER_ID, header.axID());
 508   }
 509
 510   if (dst->role == ui::AX_ROLE_COLUMN) {
 511     dst->AddIntAttribute(ui::AX_ATTR_TABLE_COLUMN_INDEX, src.columnIndex());
 512     WebAXObject header = src.columnHeader();
 513     if (!header.isDetached())
 514       dst->AddIntAttribute(ui::AX_ATTR_TABLE_COLUMN_HEADER_ID, header.axID());
 515   }
 516
 517   if (dst->role == ui::AX_ROLE_CELL ||
 518       dst->role == ui::AX_ROLE_ROW_HEADER ||
 519       dst->role == ui::AX_ROLE_COLUMN_HEADER) {
 520     dst->AddIntAttribute(ui::AX_ATTR_TABLE_CELL_COLUMN_INDEX,
 521                          src.cellColumnIndex());
 522     dst->AddIntAttribute(ui::AX_ATTR_TABLE_CELL_COLUMN_SPAN,
 523                          src.cellColumnSpan());
 524     dst->AddIntAttribute(ui::AX_ATTR_TABLE_CELL_ROW_INDEX, src.cellRowIndex());
 525     dst->AddIntAttribute(ui::AX_ATTR_TABLE_CELL_ROW_SPAN, src.cellRowSpan());
 526   }
 527
 528   dst->AddStringAttribute(ui::AX_ATTR_NAME, name);
 529
 530   // Add the ids of *indirect* children - those who are children of this node,
 531   // but whose parent is *not* this node. One example is a table
 532   // cell, which is a child of both a row and a column. Because the cell's
 533   // parent is the row, the row adds it as a child, and the column adds it
 534   // as an indirect child.
 535   int child_count = src.childCount();
 536   for (int i = 0; i < child_count; ++i) {
 537     WebAXObject child = src.childAt(i);
 538     std::vector<int32> indirect_child_ids;
 539     if (!is_iframe && !child.isDetached() && !IsParentUnignoredOf(src, child))
 540       indirect_child_ids.push_back(child.axID());
 541     if (indirect_child_ids.size() > 0) {
 542       dst->AddIntListAttribute(
 543           ui::AX_ATTR_INDIRECT_CHILD_IDS, indirect_child_ids);
 544     }
 545   }
 546
 547   WebVector<WebAXObject> controls;
 548   if (src.ariaControls(controls))
 549     AddIntListAttributeFromWebObjects(ui::AX_ATTR_CONTROLS_IDS, controls, dst);
 550
 551   WebVector<WebAXObject> describedby;
 552   if (src.ariaDescribedby(describedby)) {
 553     AddIntListAttributeFromWebObjects(
 554         ui::AX_ATTR_DESCRIBEDBY_IDS, describedby, dst);
 555   }
 556
 557   WebVector<WebAXObject> flowTo;
 558   if (src.ariaFlowTo(flowTo))
 559     AddIntListAttributeFromWebObjects(ui::AX_ATTR_FLOWTO_IDS, flowTo, dst);
 560
 561   WebVector<WebAXObject> labelledby;
 562   if (src.ariaLabelledby(labelledby)) {
 563     AddIntListAttributeFromWebObjects(
 564         ui::AX_ATTR_LABELLEDBY_IDS, labelledby, dst);
 565   }
 566
 567   WebVector<WebAXObject> owns;
 568   if (src.ariaOwns(owns))
 569     AddIntListAttributeFromWebObjects(ui::AX_ATTR_OWNS_IDS, owns, dst);
 570 }
 571
 572 blink::WebDocument BlinkAXTreeSource::GetMainDocument() const {
 573   if (render_frame_ && render_frame_->GetWebFrame())
 574     return render_frame_->GetWebFrame()->document();
 575   return WebDocument();
 576 }
 577
 578 }  // namespace content