Enable three threads for video decoding.

chrome/browser/renderer_host/browser_render_process_host.cc

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Represents the browser side of the browser <--> renderer communication
 // channel. There will be one RenderProcessHost per renderer process.
 
 #include "chrome/browser/renderer_host/browser_render_process_host.h"
 
 #include <algorithm>
@@ skipping 325 matching lines @@
     AppendRendererCommandLine(cmd_line);
     cmd_line->AppendSwitchWithValue(switches::kProcessChannelID,
                                     ASCIIToWide(channel_id));
 
     // Spawn the child process asynchronously to avoid blocking the UI thread.
     // As long as there's no renderer prefix, we can use the zygote process
     // at this stage.
     child_process_.reset(new ChildProcessLauncher(
 #if defined(OS_WIN)
         FilePath(),
-#elif defined(OS_POSIX)
+#elif defined(POSIX)
         renderer_prefix.empty(),
         base::environment_vector(),
         channel_->GetClientFileDescriptor(),
 #endif
         cmd_line,
         this));
 
     fast_shutdown_started_ = false;
   }
 
@@ skipping 191 matching lines @@
     switches::kDisableDesktopNotifications,
     switches::kDisableWebSockets,
     switches::kDisableLocalStorage,
     switches::kDisableSessionStorage,
     switches::kDisableSharedWorkers,
     switches::kDisableApplicationCache,
     switches::kEnableIndexedDatabase,
     switches::kDisableGeolocation,
     switches::kShowPaintRects,
     switches::kEnableOpenMax,
+    switches::kVideoThreads,
     switches::kEnableVideoLayering,
     switches::kEnableVideoLogging,
     switches::kEnableTouch,
     // We propagate the Chrome Frame command line here as well in case the
     // renderer is not run in the sandbox.
     switches::kChromeFrame,
     // We need to propagate this flag to determine whether to make the
     // WebGLArray constructors on the DOMWindow visible. This
     // information is needed very early during bringup. We prefer to
     // use the WebPreferences to set this flag on a page-by-page basis.
@@ skipping 492 matching lines @@
         IPC::InvalidPlatformFileForTransit(),
         std::vector<std::string>(),
         std::string(),
         false));
   }
 }
 
 void BrowserRenderProcessHost::EnableAutoSpellCorrect(bool enable) {
   Send(new ViewMsg_SpellChecker_EnableAutoSpellCorrect(enable));
 }