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