content/browser/android/content_startup_flags.cc

   1 // Copyright (c) 2012 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/browser/android/content_startup_flags.h"
   6
   7 #include "base/android/build_info.h"
   8 #include "base/base_switches.h"
   9 #include "base/command_line.h"
  10 #include "base/logging.h"
  11 #include "base/strings/string_number_conversions.h"
  12 #include "base/sys_info.h"
  13 #include "cc/base/switches.h"
  14 #include "cc/trees/layer_tree_settings.h"
  15 #include "content/public/browser/android/compositor.h"
  16 #include "content/public/browser/render_process_host.h"
  17 #include "content/public/common/content_constants.h"
  18 #include "content/public/common/content_switches.h"
  19 #include "gpu/command_buffer/service/gpu_switches.h"
  20 #include "ui/base/ui_base_switches.h"
  21 #include "ui/native_theme/native_theme_switches.h"
  22
  23 namespace content {
  24
  25 void SetContentCommandLineFlags(bool single_process,
  26                                 const std::string& plugin_descriptor) {
  27   // May be called multiple times, to cover all possible program entry points.
  28   static bool already_initialized = false;
  29   if (already_initialized)
  30     return;
  31   already_initialized = true;
  32
  33   base::CommandLine* parsed_command_line =
  34       base::CommandLine::ForCurrentProcess();
  35
  36   int command_line_renderer_limit = -1;
  37   if (parsed_command_line->HasSwitch(switches::kRendererProcessLimit)) {
  38     std::string limit = parsed_command_line->GetSwitchValueASCII(
  39         switches::kRendererProcessLimit);
  40     int value;
  41     if (base::StringToInt(limit, &value)) {
  42       command_line_renderer_limit = std::max(0, value);
  43     }
  44   }
  45
  46   if (command_line_renderer_limit > 0) {
  47     int limit = std::min(command_line_renderer_limit,
  48                          static_cast<int>(kMaxRendererProcessCount));
  49     RenderProcessHost::SetMaxRendererProcessCount(limit);
  50   }
  51
  52   if (single_process || command_line_renderer_limit == 0) {
  53     // Need to ensure the command line flag is consistent as a lot of chrome
  54     // internal code checks this directly, but it wouldn't normally get set when
  55     // we are implementing an embedded WebView.
  56     parsed_command_line->AppendSwitch(switches::kSingleProcess);
  57   }
  58
  59   parsed_command_line->AppendSwitch(cc::switches::kEnableBeginFrameScheduling);
  60
  61   parsed_command_line->AppendSwitch(switches::kEnablePinch);
  62   parsed_command_line->AppendSwitch(switches::kEnableOverlayScrollbar);
  63   parsed_command_line->AppendSwitch(switches::kValidateInputEventStream);
  64
  65   // TODO(jdduke): Use the proper SDK version when available, crbug.com/466749.
  66   if (base::android::BuildInfo::GetInstance()->sdk_int() >
  67       base::android::SDK_VERSION_LOLLIPOP_MR1) {
  68     parsed_command_line->AppendSwitch(switches::kEnableLongpressDragSelection);
  69     parsed_command_line->AppendSwitchASCII(
  70         switches::kTouchTextSelectionStrategy, "direction");
  71   }
  72
  73   // There is no software fallback on Android, so don't limit GPU crashes.
  74   parsed_command_line->AppendSwitch(switches::kDisableGpuProcessCrashLimit);
  75
  76   // On legacy low-memory devices the behavior has not been studied with regard
  77   // to having an extra process with similar priority as the foreground renderer
  78   // and given that the system will often be looking for a process to be killed
  79   // on such systems.
  80   if (base::SysInfo::IsLowEndDevice())
  81     parsed_command_line->AppendSwitch(switches::kInProcessGPU);
  82
  83   parsed_command_line->AppendSwitch(
  84       switches::kMainFrameResizesAreOrientationChanges);
  85
  86   // Disable anti-aliasing.
  87   parsed_command_line->AppendSwitch(
  88       cc::switches::kDisableCompositedAntialiasing);
  89
  90   parsed_command_line->AppendSwitch(switches::kUIPrioritizeInGpuProcess);
  91
  92   parsed_command_line->AppendSwitch(switches::kEnableDelegatedRenderer);
  93
  94   if (!plugin_descriptor.empty()) {
  95     parsed_command_line->AppendSwitchNative(
  96       switches::kRegisterPepperPlugins, plugin_descriptor);
  97   }
  98
  99   // Disable profiler timing by default.
 100   if (!parsed_command_line->HasSwitch(switches::kProfilerTiming)) {
 101     parsed_command_line->AppendSwitchASCII(
 102         switches::kProfilerTiming, switches::kProfilerTimingDisabledValue);
 103   }
 104
 105   cc::LayerSettings layer_settings;
 106   if (parsed_command_line->HasSwitch(
 107           switches::kEnableAndroidCompositorAnimationTimelines))
 108     layer_settings.use_compositor_animation_timelines = true;
 109   Compositor::SetLayerSettings(layer_settings);
 110 }
 111
 112 }  // namespace content