[Android] A prototype of the interactive media notification.

content/public/browser/web_contents_delegate.h

Index: content/public/browser/web_contents_delegate.h
diff --git a/content/public/browser/web_contents_delegate.h b/content/public/browser/web_contents_delegate.h
index 34d39f779cd801cc983f6d449a9075a16d5746aa..be239bab6a5c912b27dd394045a0ea18c2c7b58d 100644
--- a/content/public/browser/web_contents_delegate.h
+++ b/content/public/browser/web_contents_delegate.h
@@ -405,6 +405,9 @@ class CONTENT_EXPORT WebContentsDelegate {
                                    int version,
                                    const std::vector<gfx::RectF>& rects,
                                    const gfx::RectF& active_rect) {}
+
+  // Notifies the tab that the state relevant to the media controls has changed.
+  virtual void UpdateMediaControls(WebContents* web_contents) {}
 #endif
 
   // Invoked when the preferred size of the contents has been changed.