Hook up RendererMediaSessionManager with browser side

content/renderer/media/android/renderer_media_session_manager.cc

Index: content/renderer/media/android/renderer_media_session_manager.cc
diff --git a/content/renderer/media/android/renderer_media_session_manager.cc b/content/renderer/media/android/renderer_media_session_manager.cc
index c39c0dce2eefb66c02a5da977e8228ee2f888853..58b0888f568ab6c26eeec973081f924758c3c264 100644
--- a/content/renderer/media/android/renderer_media_session_manager.cc
+++ b/content/renderer/media/android/renderer_media_session_manager.cc
@@ -5,6 +5,8 @@
 #include "content/renderer/media/android/renderer_media_session_manager.h"
 
 #include "base/logging.h"
+#include "content/common/media/media_session_messages_android.h"
+#include "content/public/renderer/render_thread.h"
 #include "content/renderer/media/android/webmediasession_android.h"
 
 namespace content {
@@ -22,6 +24,16 @@ RendererMediaSessionManager::~RendererMediaSessionManager() {
          "destroyed only after all media sessions are destroyed.";
 }
 
+bool RendererMediaSessionManager::OnMessageReceived(const IPC::Message& msg) {
+  bool handled = true;
+  IPC_BEGIN_MESSAGE_MAP(RendererMediaSessionManager, msg)
+    IPC_MESSAGE_HANDLER(MediaSessionMsg_DidActivate, OnDidActivate)
+    IPC_MESSAGE_HANDLER(MediaSessionMsg_DidDeactivate, OnDidDeactivate)
+    IPC_MESSAGE_UNHANDLED(handled = false)
+  IPC_END_MESSAGE_MAP()
+  return handled;
+}
+
 int RendererMediaSessionManager::RegisterMediaSession(
     WebMediaSessionAndroid* session) {
   sessions_[next_session_id_] = session;
@@ -32,4 +44,38 @@ void RendererMediaSessionManager::UnregisterMediaSession(int session_id) {
   sessions_.erase(session_id);
 }
 
+void RendererMediaSessionManager::Activate(
+    int session_id,
+    scoped_ptr<blink::WebMediaSessionActivateCallback> callback) {
+  int request_id = pending_activation_requests_.Add(callback.release());
+  Send(new MediaSessionHostMsg_Activate(routing_id(), session_id, request_id));
+}
+
+void RendererMediaSessionManager::Deactivate(
+    int session_id,
+    scoped_ptr<blink::WebMediaSessionDeactivateCallback> callback) {
+  int request_id = pending_deactivation_requests_.Add(callback.release());
+  Send(
+      new MediaSessionHostMsg_Deactivate(routing_id(), session_id, request_id));
+}
+
+void RendererMediaSessionManager::OnDidActivate(int request_id, bool success) {
+  DCHECK(pending_activation_requests_.Lookup(request_id)) << request_id;
+  blink::WebMediaSessionActivateCallback* callback =
+      pending_activation_requests_.Lookup(request_id);
+  if (success) {
+    callback->onSuccess();
+  } else {
+    callback->onError(
+        blink::WebMediaSessionError(blink::WebMediaSessionError::Activate));
+  }
+  pending_activation_requests_.Remove(request_id);
+}
+
+void RendererMediaSessionManager::OnDidDeactivate(int request_id) {
+  DCHECK(pending_deactivation_requests_.Lookup(request_id)) << request_id;
+  pending_deactivation_requests_.Lookup(request_id)->onSuccess();
+  pending_deactivation_requests_.Remove(request_id);
+}
+
 }  // namespace content