Bug 1620113 - part3 : rename function names to explicitly mention that they're used for main controller. r=chunmin

Differential Revision: https://phabricator.services.mozilla.com/D66856

--HG--
extra : moz-landing-system : lando

dom/media/mediacontrol/MediaControlService.cpp

@@ -197,7 +197,7 @@ void MediaControlService::ControllerManager::Shutdown() {
   DisconnectMainControllerEvents();
 }
 
-void MediaControlService::ControllerManager::ControllerPlaybackStateChanged(
+void MediaControlService::ControllerManager::MainControllerPlaybackStateChanged(
     MediaSessionPlaybackState aState) {
   MOZ_ASSERT(NS_IsMainThread());
   mSource->SetPlaybackState(aState);
@@ -209,7 +209,7 @@ void MediaControlService::ControllerManager::ControllerPlaybackStateChanged(
   }
 }
 
-void MediaControlService::ControllerManager::ControllerMetadataChanged(
+void MediaControlService::ControllerManager::MainControllerMetadataChanged(
     const MediaMetadataBase& aMetadata) {
   MOZ_ASSERT(NS_IsMainThread());
   mSource->SetMediaMetadata(aMetadata);
@@ -246,10 +246,10 @@ void MediaControlService::ControllerManager::ConnectToMainControllerEvents() {
   mPlayStateChangedListener =
       mMainController->PlaybackStateChangedEvent().Connect(
           AbstractThread::MainThread(), this,
-          &ControllerManager::ControllerPlaybackStateChanged);
+          &ControllerManager::MainControllerPlaybackStateChanged);
   mMetadataChangedListener = mMainController->MetadataChangedEvent().Connect(
       AbstractThread::MainThread(), this,
-      &ControllerManager::ControllerMetadataChanged);
+      &ControllerManager::MainControllerMetadataChanged);
 
   // Update controller's current status to the event source.
   mSource->SetPlaybackState(mMainController->GetState());

dom/media/mediacontrol/MediaControlService.h

@@ -101,9 +101,9 @@ class MediaControlService final : public nsIObserver {
     MediaController* GetControllerById(uint64_t aId) const;
     uint64_t GetControllersNum() const;
 
-    // Callback functions for monitoring main controller's status change.
-    void ControllerPlaybackStateChanged(MediaSessionPlaybackState aState);
-    void ControllerMetadataChanged(const MediaMetadataBase& aMetadata);
+    // These functions are used for monitoring main controller's status change.
+    void MainControllerPlaybackStateChanged(MediaSessionPlaybackState aState);
+    void MainControllerMetadataChanged(const MediaMetadataBase& aMetadata);
 
    private:
     void UpdateMainController(MediaController* aController);