[MediaSession] Add playbackState attribute to Blink MediaSession and use it to determine playback s…

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

Index: third_party/WebKit/Source/modules/mediasession/MediaSession.idl
diff --git a/third_party/WebKit/Source/modules/mediasession/MediaSession.idl b/third_party/WebKit/Source/modules/mediasession/MediaSession.idl
index aacbeb4223e8f06a81ac835e35147b81c666e9f2..bd294bc66219ff71c5da36e1c4a47ee394748293 100644
--- a/third_party/WebKit/Source/modules/mediasession/MediaSession.idl
+++ b/third_party/WebKit/Source/modules/mediasession/MediaSession.idl
@@ -2,6 +2,14 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// https://wicg.github.io/mediasession/#enumdef-mediasessionplaybackstate
+
+enum MediaSessionPlaybackState {
+    "none",
+    "paused",
+    "playing"
+};
+
 // https://wicg.github.io/mediasession/#the-mediasession-interface
 
 [
@@ -9,9 +17,10 @@
 ] interface MediaSession : EventTarget {
     attribute MediaMetadata? metadata;
 
+    attribute MediaSessionPlaybackState playbackState;
+
     attribute EventHandler onplay;
     attribute EventHandler onpause;
-    attribute EventHandler onplaypause;
     attribute EventHandler onprevioustrack;
     attribute EventHandler onnexttrack;
     attribute EventHandler onseekforward;