Audio notification plumbed from guest WebContents up to embedder.

content/browser/browser_plugin/browser_plugin_embedder.h

Index: content/browser/browser_plugin/browser_plugin_embedder.h
diff --git a/content/browser/browser_plugin/browser_plugin_embedder.h b/content/browser/browser_plugin/browser_plugin_embedder.h
index 314053aa8050e89fce31a5ed43670c561d7b6e8e..68f167aa3b0959615aab6c786e8d4f4d2e806172 100644
--- a/content/browser/browser_plugin/browser_plugin_embedder.h
+++ b/content/browser/browser_plugin/browser_plugin_embedder.h
@@ -83,6 +83,10 @@ class CONTENT_EXPORT BrowserPluginEmbedder : public WebContentsObserver {
   // is returned.
   BrowserPluginGuest* GetFullPageGuest();
 
+  // Polls all guests for this web contents and returns true if any of them
+  // were audible recently.
+  bool WereAnyGuestsRecentlyAudible();
+
  private:
   explicit BrowserPluginEmbedder(WebContentsImpl* web_contents);
 
@@ -107,6 +111,7 @@ class CONTENT_EXPORT BrowserPluginEmbedder : public WebContentsObserver {
                           WebContents* guest);
   static bool StopFindingInGuest(StopFindAction action, WebContents* guest);
 
+  static bool GuestRecentlyAudibleCallback(WebContents* guest);

[Avi (use Gerrit), 2016/05/13 21:54:26]

newline after this line

[wjmaclean, 2016/05/13 22:17:23]

Done.

   // Message handlers.
 
   void OnAttach(RenderFrameHost* render_frame_host,