Propagate audible state from player to the containing tab

content/browser/media/media_web_contents_observer.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/media/media_web_contents_observer.h"
 
 #include "base/memory/scoped_ptr.h"
 #include "base/stl_util.h"
 #include "content/browser/media/cdm/browser_cdm_manager.h"
 #include "content/browser/renderer_host/render_process_host_impl.h"
+#include "content/browser/web_contents/web_contents_impl.h"
 #include "content/public/browser/render_frame_host.h"
 #include "content/public/browser/web_contents.h"
 #include "ipc/ipc_message_macros.h"
 
 #if defined(OS_ANDROID)
+#include "content/browser/android/media_players_observer.h"
 #include "content/browser/media/android/browser_media_player_manager.h"
 #include "content/common/media/media_player_messages_android.h"
 #include "media/base/android/media_player_android.h"
 #endif  // defined(OS_ANDROID)
 
 namespace content {
 
 MediaWebContentsObserver::MediaWebContentsObserver(
     WebContents* web_contents)
-    : WebContentsObserver(web_contents) {
+    : WebContentsObserver(web_contents)
+{
 }
 
 MediaWebContentsObserver::~MediaWebContentsObserver() {
 }
 
 void MediaWebContentsObserver::RenderFrameDeleted(
     RenderFrameHost* render_frame_host) {
 #if defined(OS_ANDROID)
   uintptr_t key = reinterpret_cast<uintptr_t>(render_frame_host);
   // Always destroy the media players before CDMs because we do not support
   // detaching CDMs from media players yet. See http://crbug.com/330324
   media_player_managers_.erase(key);
+
+  if (!static_cast<WebContentsImpl*>(web_contents())->IsBeingDestroyed()) {
+    MediaPlayersObserver* audio_observer = GetMediaPlayersObserver();
+    if (audio_observer)
+      audio_observer->RenderFrameDeleted(render_frame_host);

[Tima Vaisburd, 2015/03/02 18:37:30]

Can we rely upon MediaPlayersObserver::BrowserMediaPlayerManager::RemovePlayer
being called instead?

+  }
 #endif
   // TODO(xhwang): Currently MediaWebContentsObserver, BrowserMediaPlayerManager
   // and BrowserCdmManager all run on browser UI thread. So this call is okay.
   // In the future we need to support the case where MediaWebContentsObserver
   // get notified on browser UI thread, but BrowserMediaPlayerManager and
   // BrowserCdmManager run on a different thread.
   BrowserCdmManager* browser_cdm_manager =
       BrowserCdmManager::FromProcess(render_frame_host->GetProcess()->GetID());
   if (browser_cdm_manager)
     browser_cdm_manager->RenderFrameDeleted(render_frame_host->GetRoutingID());
 }
 
+
 #if defined(OS_ANDROID)
 
 bool MediaWebContentsObserver::OnMessageReceived(
     const IPC::Message& msg,
     RenderFrameHost* render_frame_host) {
   if (OnMediaPlayerMessageReceived(msg, render_frame_host))
     return true;
 
   if (OnMediaPlayerSetCdmMessageReceived(msg, render_frame_host))
     return true;
@@ skipping 94 matching lines @@
   // promise.
   media_player->SetCdm(cdm);
 }
 
 BrowserMediaPlayerManager* MediaWebContentsObserver::GetMediaPlayerManager(
     RenderFrameHost* render_frame_host) {
   uintptr_t key = reinterpret_cast<uintptr_t>(render_frame_host);
   if (!media_player_managers_.contains(key)) {
     media_player_managers_.set(
         key,
-        make_scoped_ptr(BrowserMediaPlayerManager::Create(render_frame_host)));
+        make_scoped_ptr(BrowserMediaPlayerManager::Create(
+            render_frame_host, GetMediaPlayersObserver())));
   }
   return media_player_managers_.get(key);
 }
 
+MediaPlayersObserver*
+MediaWebContentsObserver::GetMediaPlayersObserver() const {
+  AudioStateProvider* provider =
+      static_cast<WebContentsImpl*>(web_contents())->audio_state_provider();
+
+  MediaPlayersObserver* audio_observer =
+      static_cast<MediaPlayersObserver*>(provider);
+
+  DCHECK(audio_observer);
+  return audio_observer;
+}
+
 #if defined(VIDEO_HOLE)
 void MediaWebContentsObserver::OnFrameInfoUpdated() {
   for (MediaPlayerManagerMap::iterator iter = media_player_managers_.begin();
       iter != media_player_managers_.end(); ++iter) {
     BrowserMediaPlayerManager* manager = iter->second;
     manager->OnFrameInfoUpdated();
   }
 }
 #endif  // defined(VIDEO_HOLE)
 
 #endif  // defined(OS_ANDROID)
 
 }  // namespace content