Introduce WebMediaSession

third_party/WebKit/public/web/WebFrameClient.h

Index: third_party/WebKit/public/web/WebFrameClient.h
diff --git a/third_party/WebKit/public/web/WebFrameClient.h b/third_party/WebKit/public/web/WebFrameClient.h
index f55cd3cf0a69a8028fe10941dcd2af04be909e2e..a365ff1b3534cf1cecdf6b5776a6859f24aec5e7 100644
--- a/third_party/WebKit/public/web/WebFrameClient.h
+++ b/third_party/WebKit/public/web/WebFrameClient.h
@@ -74,6 +74,7 @@ class WebGeolocationClient;
 class WebMediaPlayer;
 class WebMediaPlayerClient;
 class WebMediaPlayerEncryptedMediaClient;
+class WebMediaSession;
 class WebMIDIClient;
 class WebNotificationPermissionCallback;
 class WebPermissionClient;
@@ -112,6 +113,9 @@ public:
     virtual WebMediaPlayer* createMediaPlayer(WebLocalFrame*, const WebURL&, WebMediaPlayerClient*, WebMediaPlayerEncryptedMediaClient*, WebContentDecryptionModule*) { return 0; }
 
     // May return null.
+    virtual WebMediaSession* createMediaSession() { return 0; }
+
+    // May return null.
     virtual WebApplicationCacheHost* createApplicationCacheHost(WebLocalFrame*, WebApplicationCacheHostClient*) { return 0; }
 
     // May return null.