Introduce WebMediaSession

content/renderer/render_frame_impl.cc

Index: content/renderer/render_frame_impl.cc
diff --git a/content/renderer/render_frame_impl.cc b/content/renderer/render_frame_impl.cc
index 339d818953fafa5f75e9d3819d5bcdec2c2aae70..cfb8ea2eaa47d991c6d3230921c7504e729a7bd9 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -175,6 +175,7 @@
 #include "content/renderer/media/android/renderer_media_player_manager.h"
 #include "content/renderer/media/android/stream_texture_factory_impl.h"
 #include "content/renderer/media/android/webmediaplayer_android.h"
+#include "content/renderer/media/android/webmediasession_android.h"
 #else
 #include "cc/blink/context_provider_web_context.h"
 #include "content/renderer/usb/web_usb_client_impl.h"
@@ -219,6 +220,7 @@ using blink::WebLocalFrame;
 using blink::WebMediaPlayer;
 using blink::WebMediaPlayerClient;
 using blink::WebMediaPlayerEncryptedMediaClient;
+using blink::WebMediaSession;
 using blink::WebNavigationPolicy;
 using blink::WebNavigationType;
 using blink::WebNode;
@@ -2127,6 +2129,14 @@ blink::WebMediaPlayer* RenderFrameImpl::createMediaPlayer(
 #endif  // defined(OS_ANDROID) && !defined(ENABLE_MEDIA_PIPELINE_ON_ANDROID)
 }
 
+blink::WebMediaSession* RenderFrameImpl::createMediaSession() {
+#if defined(OS_ANDROID)
+  return new WebMediaSessionAndroid();
+#else
+  return nullptr;
+#endif  // defined(OS_ANDROID)
+}
+
 blink::WebApplicationCacheHost* RenderFrameImpl::createApplicationCacheHost(
     blink::WebLocalFrame* frame,
     blink::WebApplicationCacheHostClient* client) {