Hook up RendererMediaSessionManager with browser side

third_party/WebKit/Source/modules/mediasession/MediaSession.cpp

Index: third_party/WebKit/Source/modules/mediasession/MediaSession.cpp
diff --git a/third_party/WebKit/Source/modules/mediasession/MediaSession.cpp b/third_party/WebKit/Source/modules/mediasession/MediaSession.cpp
index 316a3ed7423067215a4257bbaf01394aaba2c0eb..8425f5fed076bb5fb1f470f74aa5196831f491d9 100644
--- a/third_party/WebKit/Source/modules/mediasession/MediaSession.cpp
+++ b/third_party/WebKit/Source/modules/mediasession/MediaSession.cpp
@@ -17,8 +17,9 @@
 
 namespace blink {
 
-MediaSession::MediaSession(PassOwnPtr<WebMediaSession> webMediaSession)
-    : m_webMediaSession(webMediaSession)
+MediaSession::MediaSession(ExecutionContext* context, PassOwnPtr<WebMediaSession> webMediaSession)
+    : ActiveDOMObject(context)
+    , m_webMediaSession(webMediaSession)
 {
     ASSERT(m_webMediaSession);
 }
@@ -33,7 +34,7 @@ MediaSession* MediaSession::create(ExecutionContext* context, ExceptionState& ex
         exceptionState.throwDOMException(NotSupportedError, "Missing platform implementation.");
         return nullptr;
     }
-    return new MediaSession(webMediaSession.release());
+    return new MediaSession(context, webMediaSession.release());
 }
 
 ScriptPromise MediaSession::activate(ScriptState* scriptState)
@@ -54,4 +55,9 @@ ScriptPromise MediaSession::deactivate(ScriptState* scriptState)
     return promise;
 }
 
+bool MediaSession::hasPendingActivity() const
+{
+    return m_webMediaSession->hasPendingCallbacks();
+}
+
 } // namespace blink