Introduce media::RendererFactory interface.

content/public/renderer/content_renderer_client.h

Index: content/public/renderer/content_renderer_client.h
diff --git a/content/public/renderer/content_renderer_client.h b/content/public/renderer/content_renderer_client.h
index 9a6c695d5df5f0bea350beaa205d6919a6439fcd..2436987a977fcd05838d90ef38843c314166412c 100644
--- a/content/public/renderer/content_renderer_client.h
+++ b/content/public/renderer/content_renderer_client.h
@@ -53,7 +53,7 @@ struct WebURLError;
 }
 
 namespace media {
-class Renderer;
+class RendererFactory;
 struct KeySystemInfo;
 }
 
@@ -257,11 +257,9 @@ class CONTENT_EXPORT ContentRendererClient {
   // Returns true if the page at |url| can use Pepper MediaStream APIs.
   virtual bool AllowPepperMediaStreamAPI(const GURL& url);
 
-  // Allows an embedder to create a media::Renderer. The caller owns the
-  // returned renderer.
-  virtual scoped_ptr<media::Renderer> CreateMediaRenderer(
-      RenderFrame* render_frame,
-      const scoped_refptr<base::SingleThreadTaskRunner>& task_runner);
+  // Allows an embedder to provide a media::RendererFactory.
+  virtual scoped_ptr<media::RendererFactory> CreateMediaRendererFactory(
+      RenderFrame* render_frame);
 
   // Gives the embedder a chance to register the key system(s) it supports by
   // populating |key_systems|.