Makes it possible to run content_browsertests with --as-browser and fake WebRTC devices.

content/browser/browser_main_loop.h

Index: content/browser/browser_main_loop.h
diff --git a/content/browser/browser_main_loop.h b/content/browser/browser_main_loop.h
index eb3de50d1b066c22d45939e67dd6a2a03df315f3..1fe269f4483808b9f966416ba96e2039ee0c7547 100644
--- a/content/browser/browser_main_loop.h
+++ b/content/browser/browser_main_loop.h
@@ -84,6 +84,9 @@ class BrowserMainLoop {
   static media::AudioManager* GetAudioManager();
   static media_stream::MediaStreamManager* GetMediaStreamManager();
 
+  // Should be called before RunMainMessageLoopParts (on the thread that calls
+  // that method).
+  static void UseFakeMediaStreamDevice();
  private:
   // For ShutdownThreadsAndCleanUp.
   friend class BrowserShutdownImpl;
@@ -138,6 +141,9 @@ class BrowserMainLoop {
   scoped_ptr<BrowserProcessSubThread> cache_thread_;
   scoped_ptr<BrowserProcessSubThread> io_thread_;
 
+  // Static members.
+  static bool use_fake_media_stream_device_;
+
 #if defined(OS_WIN)
   ui::ScopedOleInitializer ole_initializer_;
 #endif