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