Move ExternalVideoSurfaceHolder from WebContents UserData to BrowserMediaPlayerManager.

content/public/browser/content_browser_client.h

Index: content/public/browser/content_browser_client.h
diff --git a/content/public/browser/content_browser_client.h b/content/public/browser/content_browser_client.h
index 01c2eb93e039131faa11d35a60ab5688134bb724..c4da44af612f323a6bef0025177ecb4968ca5381 100644
--- a/content/public/browser/content_browser_client.h
+++ b/content/public/browser/content_browser_client.h
@@ -87,6 +87,7 @@ class BrowserMainParts;
 class BrowserPluginGuestDelegate;
 class BrowserPpapiHost;
 class BrowserURLHandler;
+class ExternalVideoSurfaceContainer;
 class LocationProvider;
 class MediaObserver;
 class QuotaPermissionContext;
@@ -645,6 +646,13 @@ class CONTENT_EXPORT ContentBrowserClient {
   // This is called on the IO thread.
   virtual net::CookieStore* OverrideCookieStoreForRenderProcess(
       int render_process_id_);
+
+#if defined(VIDEO_HOLE)
+  // Allows an embedder to provide its own ExternalVideoSurfaceContainer
+  // implementation.
+  virtual ExternalVideoSurfaceContainer* CreateExternalVideoSurfaceContainer(
+      WebContents* web_contents);
+#endif
 };
 
 }  // namespace content