Adding new media controls to MediaNotification

content/public/browser/web_contents_observer.h

Index: content/public/browser/web_contents_observer.h
diff --git a/content/public/browser/web_contents_observer.h b/content/public/browser/web_contents_observer.h
index 704c509ca61dde486397478d641fd8c438bfc1cc..35c17ab1ad34bf74810381b339af5889b7694e63 100644
--- a/content/public/browser/web_contents_observer.h
+++ b/content/public/browser/web_contents_observer.h
@@ -24,6 +24,12 @@
 #include "ui/base/page_transition_types.h"
 #include "ui/base/window_open_disposition.h"
 
+namespace blink {
+namespace mojom {
+enum class MediaSessionAction;
+}
+}
+
 namespace content {
 
 class NavigationEntry;
@@ -468,6 +474,9 @@ class CONTENT_EXPORT WebContentsObserver : public IPC::Listener,
   virtual void MediaStartedPlaying(const MediaPlayerId& id) {}
   virtual void MediaStoppedPlaying(const MediaPlayerId& id) {}
 
+  // TODO(zqzhang): Decouple MediaSession messages from WebContents to avoid
+  // plumbing. See https://crbug.com/658678
+
   // Invoked when media session has changed its state.
   virtual void MediaSessionStateChanged(bool is_controllable,
                                         bool is_suspended) {}
@@ -477,6 +486,14 @@ class CONTENT_EXPORT WebContentsObserver : public IPC::Listener,
   virtual void MediaSessionMetadataChanged(
       const base::Optional<MediaMetadata>& metadata) {}
 
+  // Invoked when media session action is enabled.
+  virtual void MediaSessionEnabledAction(
+      blink::mojom::MediaSessionAction action) {}
+
+  // Invoked when media session action is disabled.
+  virtual void MediaSessionDisabledAction(
+      blink::mojom::MediaSessionAction action) {}
+
   // Invoked when the renderer process changes the page scale factor.
   virtual void OnPageScaleFactorChanged(float page_scale_factor) {}