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      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(bool single_process,
     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   base::CommandLine* parsed_command_line =
     30       base::CommandLine::ForCurrentProcess();
     31 
     32   int command_line_renderer_limit = -1;
     33   if (parsed_command_line->HasSwitch(switches::kRendererProcessLimit)) {
     34     std::string limit = parsed_command_line->GetSwitchValueASCII(
     35         switches::kRendererProcessLimit);
     36     int value;
     37     if (base::StringToInt(limit, &value)) {
     38       command_line_renderer_limit = std::max(0, value);
     39     }
     40   }
     41 
     42   if (command_line_renderer_limit > 0) {
     43     int limit = std::min(command_line_renderer_limit,
     44                          static_cast<int>(kMaxRendererProcessCount));
     45     RenderProcessHost::SetMaxRendererProcessCount(limit);
     46   }
     47 
     48   if (single_process || command_line_renderer_limit == 0) {
     49     // Need to ensure the command line flag is consistent as a lot of chrome
     50     // internal code checks this directly, but it wouldn't normally get set when
     51     // we are implementing an embedded WebView.
     52     parsed_command_line->AppendSwitch(switches::kSingleProcess);
     53   }
     54 
     55   parsed_command_line->AppendSwitch(switches::kEnableBeginFrameScheduling);
     56 
     57   parsed_command_line->AppendSwitch(switches::kEnablePinch);
     58   parsed_command_line->AppendSwitch(switches::kEnableOverlayFullscreenVideo);
     59   parsed_command_line->AppendSwitch(switches::kEnableOverlayScrollbar);
     60   parsed_command_line->AppendSwitch(switches::kEnableOverscrollNotifications);
     61   parsed_command_line->AppendSwitch(switches::kValidateInputEventStream);
     62 
     63   // Run the GPU service as a thread in the browser instead of as a
     64   // standalone process.
     65   parsed_command_line->AppendSwitch(switches::kInProcessGPU);
     66   parsed_command_line->AppendSwitch(switches::kDisableGpuShaderDiskCache);
     67 
     68   parsed_command_line->AppendSwitch(switches::kEnableViewport);
     69   parsed_command_line->AppendSwitch(switches::kEnableViewportMeta);
     70   parsed_command_line->AppendSwitch(
     71       switches::kMainFrameResizesAreOrientationChanges);
     72 
     73   // Disable anti-aliasing.
     74   parsed_command_line->AppendSwitch(
     75       cc::switches::kDisableCompositedAntialiasing);
     76 
     77   parsed_command_line->AppendSwitch(switches::kUIPrioritizeInGpuProcess);
     78 
     79   parsed_command_line->AppendSwitch(switches::kEnableDelegatedRenderer);
     80 
     81   if (!plugin_descriptor.empty()) {
     82     parsed_command_line->AppendSwitchNative(
     83       switches::kRegisterPepperPlugins, plugin_descriptor);
     84   }
     85 
     86   // Disable profiler timing by default.
     87   if (!parsed_command_line->HasSwitch(switches::kProfilerTiming)) {
     88     parsed_command_line->AppendSwitchASCII(
     89         switches::kProfilerTiming, switches::kProfilerTimingDisabledValue);
     90   }
     91 }
     92 
     93 }  // namespace content
     94