Move audio focus control from media/ to content/ and make it per WebContents.

content/browser/media/android/browser_media_player_manager.cc

Index: content/browser/media/android/browser_media_player_manager.cc
diff --git a/content/browser/media/android/browser_media_player_manager.cc b/content/browser/media/android/browser_media_player_manager.cc
index 68268f7406d215d98953787c36061d5b870c0f8f..c77ead00d628256ff9c02032484d8daab23525c4 100644
--- a/content/browser/media/android/browser_media_player_manager.cc
+++ b/content/browser/media/android/browser_media_player_manager.cc
@@ -10,6 +10,7 @@
 #include "content/browser/android/media_players_observer.h"
 #include "content/browser/media/android/browser_demuxer_android.h"
 #include "content/browser/media/android/media_resource_getter_impl.h"
+#include "content/browser/media/android/media_session.h"
 #include "content/browser/renderer_host/render_view_host_impl.h"
 #include "content/browser/web_contents/web_contents_view_android.h"
 #include "content/common/media/media_player_messages_android.h"
@@ -44,6 +45,9 @@ namespace content {
 const int kMediaPlayerThreshold = 1;
 const int kInvalidMediaPlayerId = -1;
 
+// Minimal duration of a media player in order to be considered as Content type.
+const int kMinimumDurationForContentInSeconds = 5;
+
 static BrowserMediaPlayerManager::Factory g_factory = NULL;
 static media::MediaUrlInterceptor* media_url_interceptor_ = NULL;
 
@@ -160,6 +164,7 @@ BrowserMediaPlayerManager::~BrowserMediaPlayerManager() {
   for (MediaPlayerAndroid* player : players_)
     player->DeleteOnCorrectThread();
 
+  MediaSession::Get(web_contents())->RemovePlayers(this);
   players_.weak_clear();
 }
 
@@ -228,6 +233,8 @@ void BrowserMediaPlayerManager::OnMediaMetadataChanged(
 
 void BrowserMediaPlayerManager::OnPlaybackComplete(int player_id) {
   Send(new MediaPlayerMsg_MediaPlaybackCompleted(RoutingID(), player_id));
+  MediaSession::Get(web_contents())->RemovePlayer(this, player_id);
+
   if (fullscreen_player_id_ == player_id)
     video_view_->OnPlaybackComplete();
 }
@@ -341,6 +348,21 @@ void BrowserMediaPlayerManager::RequestFullScreen(int player_id) {
   Send(new MediaPlayerMsg_RequestFullscreen(RoutingID(), player_id));
 }
 
+bool BrowserMediaPlayerManager::RequestPlay(int player_id) {
+  MediaPlayerAndroid* player = GetPlayer(player_id);
+  DCHECK(player);
+
+  MediaSession::Type media_session_type =
+      player->GetDuration().InSeconds() > kMinimumDurationForContentInSeconds
+          ? MediaSession::Type::Content : MediaSession::Type::Transient;
+
+  bool succeeded = MediaSession::Get(web_contents())->AddPlayer(
+      this, player_id, media_session_type);
+  if (!succeeded)
+    Send(new MediaPlayerMsg_DidMediaPlayerPause(RoutingID(), player_id));
+  return succeeded;
+}
+
 #if defined(VIDEO_HOLE)
 void BrowserMediaPlayerManager::AttachExternalVideoSurface(int player_id,
                                                            jobject surface) {
@@ -365,6 +387,22 @@ void BrowserMediaPlayerManager::OnFrameInfoUpdated() {
     external_video_surface_container_->OnFrameInfoUpdated();
 }
 
+void BrowserMediaPlayerManager::OnSuspend(int player_id) {
+  MediaPlayerAndroid* player = GetPlayer(player_id);
+  DCHECK(player);
+
+  player->Pause(true);
+  Send(new MediaPlayerMsg_DidMediaPlayerPause(RoutingID(), player_id));
+}
+
+void BrowserMediaPlayerManager::OnResume(int player_id) {
+  MediaPlayerAndroid* player = GetPlayer(player_id);
+  DCHECK(player);
+
+  player->Start();
+  Send(new MediaPlayerMsg_DidMediaPlayerPlay(RoutingID(), player_id));
+}
+
 void BrowserMediaPlayerManager::OnNotifyExternalSurface(
     int player_id, bool is_request, const gfx::RectF& rect) {
   if (!web_contents_)
@@ -503,6 +541,8 @@ void BrowserMediaPlayerManager::OnPause(
   MediaPlayerAndroid* player = GetPlayer(player_id);
   if (player)
     player->Pause(is_media_related_action);
+
+  MediaSession::Get(web_contents())->RemovePlayer(this, player_id);
 }
 
 void BrowserMediaPlayerManager::OnSetVolume(int player_id, double volume) {