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