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