Add MediaSessionObserver to allow clients observe MediaSession directly

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 42 matching lines @@
 #include "content/browser/frame_host/render_frame_host_impl.h"
 #include "content/browser/frame_host/render_frame_proxy_host.h"
 #include "content/browser/frame_host/render_widget_host_view_child_frame.h"
 #include "content/browser/host_zoom_map_impl.h"
 #include "content/browser/loader/loader_io_thread_notifier.h"
 #include "content/browser/loader/resource_dispatcher_host_impl.h"
 #include "content/browser/manifest/manifest_manager_host.h"
 #include "content/browser/media/audio_stream_monitor.h"
 #include "content/browser/media/capture/web_contents_audio_muter.h"
 #include "content/browser/media/media_web_contents_observer.h"
-#include "content/browser/media/session/media_session.h"
+#include "content/browser/media/session/media_session_impl.h"
 #include "content/browser/message_port_message_filter.h"
 #include "content/browser/plugin_content_origin_whitelist.h"
 #include "content/browser/renderer_host/render_process_host_impl.h"
 #include "content/browser/renderer_host/render_view_host_delegate_view.h"
 #include "content/browser/renderer_host/render_view_host_impl.h"
 #include "content/browser/renderer_host/render_widget_host_impl.h"
 #include "content/browser/renderer_host/render_widget_host_input_event_router.h"
 #include "content/browser/renderer_host/render_widget_host_view_base.h"
 #include "content/browser/renderer_host/text_input_manager.h"
 #include "content/browser/screen_orientation/screen_orientation_dispatcher_host_impl.h"
@@ skipping 3706 matching lines @@
   RenderViewHostImpl* rvhi =
       static_cast<RenderViewHostImpl*>(render_view_message_source_);
   if (!rvhi->is_active())
     return;
 
   for (auto& observer : observers_)
     observer.DidUpdateFaviconURL(candidates);
 }
 
 void WebContentsImpl::OnMediaSessionStateChanged() {
-  MediaSession* session = MediaSession::Get(this);
+  MediaSessionImpl* session = MediaSessionImpl::Get(this);
   for (auto& observer : observers_) {
     observer.MediaSessionStateChanged(session->IsControllable(),
                                        session->IsSuspended());
   }
 }
 
 void WebContentsImpl::OnMediaSessionMetadataChanged() {
-  MediaSession* session = MediaSession::Get(this);
+  MediaSessionImpl* session = MediaSessionImpl::Get(this);
   for (auto& observer : observers_) {
     observer.MediaSessionMetadataChanged(session->metadata());
   }
 }
 
 void WebContentsImpl::ResumeMediaSession() {
-  MediaSession::Get(this)->Resume(MediaSession::SuspendType::UI);
+  MediaSessionImpl::Get(this)->Resume(MediaSession::SuspendType::UI);
 }
 
 void WebContentsImpl::SuspendMediaSession() {
-  MediaSession::Get(this)->Suspend(MediaSession::SuspendType::UI);
+  MediaSessionImpl::Get(this)->Suspend(MediaSession::SuspendType::UI);
 }
 
 void WebContentsImpl::StopMediaSession() {
-  MediaSession::Get(this)->Stop(MediaSession::SuspendType::UI);
+  MediaSessionImpl::Get(this)->Stop(MediaSession::SuspendType::UI);
 }
 
 void WebContentsImpl::OnPasswordInputShownOnHttp() {
   controller_.ssl_manager()->DidShowPasswordInputOnHttp();
 }
 
 void WebContentsImpl::OnCreditCardInputShownOnHttp() {
   controller_.ssl_manager()->DidShowCreditCardInputOnHttp();
 }
 
@@ skipping 1380 matching lines @@
   dialog_manager_ = dialog_manager;
 }
 
 void WebContentsImpl::RemoveBindingSet(const std::string& interface_name) {
   auto it = binding_sets_.find(interface_name);
   if (it != binding_sets_.end())
     binding_sets_.erase(it);
 }
 
 }  // namespace content