Bug 1582569 - part1 : implement 'skipad'. r=chunmin,webidl,peterv

Implement `skipad` action.

https://w3c.github.io/mediasession/#dom-mediasessionaction-skipad

Differential Revision: https://phabricator.services.mozilla.com/D82579

dom/chrome-webidl/MediaController.webidl

@@ -15,6 +15,7 @@ enum MediaControlKey {
   "nexttrack",
   "seekbackward",
   "seekforward",
+  "skipad",
   "stop",
 };
 

dom/media/mediacontrol/ContentPlaybackController.cpp

@@ -108,9 +108,7 @@ void ContentPlaybackController::NextTrack() {
 }
 
 void ContentPlaybackController::SkipAd() {
-  // TODO : use media session's action handler if it exists. MediaSessionAction
-  // doesn't support `skipad` yet.
-  return;
+  NotifyMediaSessionWhenActionIsSupported(MediaSessionAction::Skipad);
 }
 
 void ContentPlaybackController::Stop() {
@@ -156,6 +154,9 @@ void ContentMediaControlKeyHandler::HandleMediaControlKey(
     case MediaControlKey::Seekforward:
       controller.SeekForward();
       return;
+    case MediaControlKey::Skipad:
+      controller.SkipAd();
+      return;
     default:
       MOZ_ASSERT_UNREACHABLE("Invalid event.");
   };

dom/media/mediacontrol/MediaControlKeySource.cpp

@@ -66,6 +66,9 @@ void MediaControlKeyHandler::OnKeyPressed(MediaControlKey aKey) {
     case MediaControlKey::Seekforward:
       controller->SeekForward();
       return;
+    case MediaControlKey::Skipad:
+      controller->SkipAd();
+      return;
     case MediaControlKey::Stop:
       controller->Stop();
       return;

dom/media/mediacontrol/MediaControlUtils.h

@@ -35,6 +35,8 @@ inline const char* ToMediaControlKeyStr(MediaControlKey aKey) {
       return "Seek backward";
     case MediaControlKey::Seekforward:
       return "Seek forward";
+    case MediaControlKey::Skipad:
+      return "Skip Ad";
     case MediaControlKey::Stop:
       return "Stop";
     default:
@@ -57,6 +59,8 @@ inline const char* ToMediaSessionActionStr(MediaSessionAction aAction) {
       return "previous track";
     case MediaSessionAction::Nexttrack:
       return "next track";
+    case MediaSessionAction::Skipad:
+      return "skip ad";
     default:
       MOZ_ASSERT(aAction == MediaSessionAction::Stop);
       return "stop";
@@ -78,6 +82,8 @@ inline MediaControlKey ConvertMediaSessionActionToControlKey(
       return MediaControlKey::Previoustrack;
     case MediaSessionAction::Nexttrack:
       return MediaControlKey::Nexttrack;
+    case MediaSessionAction::Skipad:
+      return MediaControlKey::Skipad;
     default:
       MOZ_ASSERT(aAction == MediaSessionAction::Stop);
       return MediaControlKey::Stop;

dom/media/mediacontrol/MediaController.cpp

@@ -116,6 +116,11 @@ void MediaController::SeekForward() {
   UpdateMediaControlKeyToContentMediaIfNeeded(MediaControlKey::Seekforward);
 }
 
+void MediaController::SkipAd() {
+  LOG("Skip Ad");
+  UpdateMediaControlKeyToContentMediaIfNeeded(MediaControlKey::Skipad);
+}
+
 void MediaController::Stop() {
   LOG("Stop");
   UpdateMediaControlKeyToContentMediaIfNeeded(MediaControlKey::Stop);

dom/media/mediacontrol/MediaController.h

@@ -39,6 +39,7 @@ class IMediaController {
   virtual void NextTrack() = 0;
   virtual void SeekBackward() = 0;
   virtual void SeekForward() = 0;
+  virtual void SkipAd() = 0;
 
   // Return the ID of the top level browsing context within a tab.
   virtual uint64_t Id() const = 0;
@@ -97,6 +98,8 @@ class MediaController final : public DOMEventTargetHelper,
   void NextTrack() override;
   void SeekBackward() override;
   void SeekForward() override;
+  void SkipAd() override;
+
   uint64_t Id() const override;
   bool IsAudible() const override;
   bool IsPlaying() const override;

dom/webidl/MediaSession.webidl

@@ -13,7 +13,7 @@ enum MediaSessionPlaybackState {
   "playing"
 };
 
-// TODO: Implement the missing seekto (bug 1621403) and skipad (bug 1582569) actions
+// TODO: Implement the missing seekto (bug 1621403)
 enum MediaSessionAction {
   "play",
   "pause",
@@ -21,6 +21,7 @@ enum MediaSessionAction {
   "seekforward",
   "previoustrack",
   "nexttrack",
+  "skipad",
   "stop",
 };