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 "cc/base/switches.h"
  12 #include "content/public/browser/render_process_host.h"
  13 #include "content/public/common/content_constants.h"
  14 #include "content/public/common/content_switches.h"
  15 #include "gpu/command_buffer/service/gpu_switches.h"
  16 #include "ui/base/ui_base_switches.h"
  17 #include "ui/native_theme/native_theme_switches.h"
  18
  19 namespace content {
  20
  21 void SetContentCommandLineFlags(int max_render_process_count,
  22                                 const std::string& plugin_descriptor) {
  23   // May be called multiple times, to cover all possible program entry points.
  24   static bool already_initialized = false;
  25   if (already_initialized)
  26     return;
  27   already_initialized = true;
  28
  29   CommandLine* parsed_command_line = CommandLine::ForCurrentProcess();
  30
  31   int command_line_renderer_limit = -1;
  32   if (parsed_command_line->HasSwitch(switches::kRendererProcessLimit)) {
  33     std::string limit = parsed_command_line->GetSwitchValueASCII(
  34         switches::kRendererProcessLimit);
  35     int value;
  36     if (base::StringToInt(limit, &value)) {
  37       command_line_renderer_limit = value;
  38       if (value <= 0)
  39         max_render_process_count = 0;
  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   } else if (max_render_process_count <= 0) {
  48     // Need to ensure the command line flag is consistent as a lot of chrome
  49     // internal code checks this directly, but it wouldn't normally get set when
  50     // we are implementing an embedded WebView.
  51     parsed_command_line->AppendSwitch(switches::kSingleProcess);
  52   } else {
  53     int default_maximum = RenderProcessHost::GetMaxRendererProcessCount();
  54     DCHECK(default_maximum <= static_cast<int>(kMaxRendererProcessCount));
  55     if (max_render_process_count < default_maximum)
  56       RenderProcessHost::SetMaxRendererProcessCount(max_render_process_count);
  57   }
  58
  59   parsed_command_line->AppendSwitch(switches::kForceCompositingMode);
  60   parsed_command_line->AppendSwitch(switches::kEnableThreadedCompositing);
  61   parsed_command_line->AppendSwitch(
  62       switches::kEnableCompositingForFixedPosition);
  63   parsed_command_line->AppendSwitch(switches::kEnableAcceleratedOverflowScroll);
  64   parsed_command_line->AppendSwitch(switches::kEnableBeginFrameScheduling);
  65
  66   parsed_command_line->AppendSwitch(switches::kDisableGestureDebounce);
  67   parsed_command_line->AppendSwitch(switches::kEnableGestureTapHighlight);
  68   parsed_command_line->AppendSwitch(switches::kEnablePinch);
  69   parsed_command_line->AppendSwitch(switches::kEnableOverlayFullscreenVideo);
  70   parsed_command_line->AppendSwitch(switches::kEnableOverlayScrollbar);
  71   parsed_command_line->AppendSwitch(switches::kEnableOverscrollNotifications);
  72   parsed_command_line->AppendSwitchASCII(switches::kTouchAckTimeoutDelayMs,
  73                                          "200");
  74
  75   // Run the GPU service as a thread in the browser instead of as a
  76   // standalone process.
  77   parsed_command_line->AppendSwitch(switches::kInProcessGPU);
  78   parsed_command_line->AppendSwitch(switches::kDisableGpuShaderDiskCache);
  79
  80   parsed_command_line->AppendSwitch(switches::kEnableViewport);
  81   parsed_command_line->AppendSwitch(switches::kEnableViewportMeta);
  82   parsed_command_line->AppendSwitch(
  83       switches::kMainFrameResizesAreOrientationChanges);
  84
  85   // Disable anti-aliasing.
  86   parsed_command_line->AppendSwitch(
  87       cc::switches::kDisableCompositedAntialiasing);
  88
  89   parsed_command_line->AppendSwitch(switches::kUIPrioritizeInGpuProcess);
  90
  91   parsed_command_line->AppendSwitch(switches::kEnableDelegatedRenderer);
  92
  93   if (!plugin_descriptor.empty()) {
  94     parsed_command_line->AppendSwitchNative(
  95       switches::kRegisterPepperPlugins, plugin_descriptor);
  96   }
  97
  98   // Disable profiler timing by default.
  99   if (!parsed_command_line->HasSwitch(switches::kProfilerTiming)) {
 100     parsed_command_line->AppendSwitchASCII(
 101         switches::kProfilerTiming, switches::kProfilerTimingDisabledValue);
 102   }
 103 }
 104
 105 }  // namespace content