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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 <jni.h>
      6 
      7 #include "chrome/browser/android/chrome_startup_flags.h"
      8 
      9 #include "base/android/jni_android.h"
     10 #include "base/android/jni_string.h"
     11 #include "base/android/scoped_java_ref.h"
     12 #include "base/android/sys_utils.h"
     13 #include "base/command_line.h"
     14 #include "base/logging.h"
     15 #include "chrome/common/chrome_switches.h"
     16 #include "chrome/common/chrome_version_info.h"
     17 #include "content/public/common/content_switches.h"
     18 #include "media/base/media_switches.h"
     19 
     20 namespace {
     21 
     22 void SetCommandLineSwitch(const std::string& switch_string) {
     23   CommandLine* command_line = CommandLine::ForCurrentProcess();
     24   if (!command_line->HasSwitch(switch_string))
     25     command_line->AppendSwitch(switch_string);
     26 }
     27 
     28 void SetCommandLineSwitchASCII(const std::string& switch_string,
     29                                const std::string& value) {
     30   CommandLine* command_line = CommandLine::ForCurrentProcess();
     31   if (!command_line->HasSwitch(switch_string))
     32     command_line->AppendSwitchASCII(switch_string, value);
     33 }
     34 
     35 }  // namespace
     36 
     37 void SetChromeSpecificCommandLineFlags() {
     38   // Enable prerender with holdback.
     39   SetCommandLineSwitchASCII(switches::kPrerenderMode,
     40                             switches::kPrerenderModeSwitchValueAuto);
     41 
     42   // Enable prerender for the omnibox.
     43   SetCommandLineSwitchASCII(switches::kPrerenderFromOmnibox,
     44                             switches::kPrerenderFromOmniboxSwitchValueEnabled);
     45 
     46   // Disable syncing favicons on low end devices.
     47   if (base::android::SysUtils::IsLowEndDevice())
     48     SetCommandLineSwitchASCII(switches::kDisableSyncTypes, "Favicon Images");
     49 
     50   // Enable DOM Distiller on local builds, canary and dev-channel.
     51   chrome::VersionInfo::Channel channel = chrome::VersionInfo::GetChannel();
     52   if (channel == chrome::VersionInfo::CHANNEL_UNKNOWN ||
     53       channel == chrome::VersionInfo::CHANNEL_CANARY ||
     54       channel == chrome::VersionInfo::CHANNEL_DEV) {
     55     SetCommandLineSwitch(switches::kEnableDomDistiller);
     56   }
     57 }
     58