Allow CastContentBrowserClient to customise media pipeline device

chromecast/browser/cast_content_browser_client.h

Index: chromecast/browser/cast_content_browser_client.h
diff --git a/chromecast/browser/cast_content_browser_client.h b/chromecast/browser/cast_content_browser_client.h
index 5e5c262f92a103087e4856b5e9ec9a72bf0bc45f..f15537a1fd5dfe7a4cde100ec1d7151f593cb0b3 100644
--- a/chromecast/browser/cast_content_browser_client.h
+++ b/chromecast/browser/cast_content_browser_client.h
@@ -30,6 +30,11 @@ class HostResolver;
 }
 
 namespace chromecast {
+namespace media {
+class MediaPipelineDevice;
+class MediaPipelineDeviceParams;
+}
+
 namespace shell {
 
 class CastBrowserMainParts;
@@ -48,6 +53,13 @@ class CastContentBrowserClient: public content::ContentBrowserClient {
   std::vector<scoped_refptr<content::BrowserMessageFilter>>
   PlatformGetBrowserMessageFilters();
 
+#if !defined(OS_ANDROID)
+  // Creates a MediaPipelineDevice (CMA backend) for media playback, called
+  // once per media player instance.
+  scoped_ptr<media::MediaPipelineDevice> PlatformCreateMediaPipelineDevice(
+      const media::MediaPipelineDeviceParams& params);
+#endif
+
   // content::ContentBrowserClient implementation:
   content::BrowserMainParts* CreateBrowserMainParts(
       const content::MainFunctionParams& parameters) override;