Implement MediaSession (metadata) per frame [NOT READY, HAS DEPENDENCY]

content/browser/web_contents/web_contents_impl.cc

 // Copyright (c) 2012 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/web_contents/web_contents_impl.h"
 
 #include <stddef.h>
 
 #include <cmath>
 #include <utility>
@@ skipping 114 matching lines @@
 #include "third_party/WebKit/public/web/WebSandboxFlags.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "ui/accessibility/ax_tree_combiner.h"
 #include "ui/base/layout.h"
 #include "ui/events/blink/web_input_event_traits.h"
 #include "ui/gl/gl_switches.h"
 
 #if defined(OS_ANDROID)
 #include "content/browser/android/content_video_view.h"
 #include "content/browser/android/date_time_chooser_android.h"
+#include "content/browser/media/android/browser_media_session_manager.h"
 #include "content/browser/media/android/media_web_contents_observer_android.h"
 #include "content/browser/web_contents/web_contents_android.h"
 #endif  // OS_ANDROID
 
 #if defined(OS_MACOSX)
 #include "base/mac/foundation_util.h"
 #endif
 
 #if defined(USE_AURA)
 #include "content/browser/web_contents/web_contents_view_mus.h"
@@ skipping 3662 matching lines @@
       static_cast<RenderViewHostImpl*>(render_view_message_source_);
   if (!rvhi->is_active())
     return;
 
   FOR_EACH_OBSERVER(WebContentsObserver, observers_,
                     DidUpdateFaviconURL(candidates));
 }
 
 void WebContentsImpl::OnMediaSessionStateChanged() {
   MediaSession* session = MediaSession::Get(this);
+  base::Optional<MediaMetadata> metadata;
+#if defined(OS_ANDROID)

[whywhat, 2016/09/13 16:23:26]

does it have to be android only? I thought we have MediaSession on desktop
behind the flag.

[Zhiqiang Zhang (Slow), 2016/09/13 17:15:56]

Yes, BrowserMediaSessionManager is in content/browser/media/android/

+  BrowserMediaSessionManager* session_manager =
+      static_cast<MediaWebContentsObserverAndroid*>(
+          media_web_contents_observer())
+          ->GetMediaSessionManager(GetMainFrame());
+  if (session_manager->media_metadata()) {
+    metadata = *session_manager->media_metadata();
+  }
+#endif  // defined(OS_ANDROID)
   FOR_EACH_OBSERVER(WebContentsObserver, observers_,
                     MediaSessionStateChanged(session->IsControllable(),
-                                             session->IsSuspended(),
-                                             session->metadata()));
+                                             session->IsSuspended(), metadata));
 }
 
 void WebContentsImpl::ResumeMediaSession() {
   MediaSession::Get(this)->Resume(MediaSession::SuspendType::UI);
 }
 
 void WebContentsImpl::SuspendMediaSession() {
   MediaSession::Get(this)->Suspend(MediaSession::SuspendType::UI);
 }
 
@@ skipping 1372 matching lines @@
   for (RenderViewHost* render_view_host : render_view_host_set)
     render_view_host->OnWebkitPreferencesChanged();
 }
 
 void WebContentsImpl::SetJavaScriptDialogManagerForTesting(
     JavaScriptDialogManager* dialog_manager) {
   dialog_manager_ = dialog_manager;
 }
 
 }  // namespace content