Allow MediaSession in iframes to be routed

chrome/android/java/src/org/chromium/chrome/browser/media/ui/MediaSessionTabHelper.java

Index: chrome/android/java/src/org/chromium/chrome/browser/media/ui/MediaSessionTabHelper.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/media/ui/MediaSessionTabHelper.java b/chrome/android/java/src/org/chromium/chrome/browser/media/ui/MediaSessionTabHelper.java
index 57c2dde165b714c12260e51f4ee81e1b3502d999..3179cee4abca701f816fa89765210d11279366bf 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/media/ui/MediaSessionTabHelper.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/media/ui/MediaSessionTabHelper.java
@@ -30,8 +30,7 @@ import org.chromium.ui.base.WindowAndroid;
 
 import java.net.URI;
 import java.net.URISyntaxException;
-import java.util.HashSet;
-import java.util.Set;
+import java.util.List;
 
 import javax.annotation.Nullable;
 
@@ -61,7 +60,7 @@ public class MediaSessionTabHelper implements MediaImageCallback {
     // The currently showing metadata.
     private MediaMetadata mCurrentMetadata = null;
     private MediaImageManager mMediaImageManager = null;
-    private Set<Integer> mMediaSessionActions = new HashSet<Integer>();
+    private List<Integer> mMediaSessionActions = null;
     private Handler mHandler;
     // The delayed task to hide notification. Hiding notification can be immediate or delayed.
     // Delayed hiding will schedule this delayed task to |mHandler|. The task will be canceled when
@@ -228,16 +227,8 @@ public class MediaSessionTabHelper implements MediaImageCallback {
             }
 
             @Override
-            public void mediaSessionEnabledAction(int action) {
-                if (!MediaSessionAction.isKnownValue(action)) return;
-                mMediaSessionActions.add(action);
-                updateNotificationActions();
-            }
-
-            @Override
-            public void mediaSessionDisabledAction(int action) {
-                if (!MediaSessionAction.isKnownValue(action)) return;
-                mMediaSessionActions.remove(action);
+            public void mediaSessionActionsChanged(List<Integer> actions) {
+                mMediaSessionActions = actions;
                 updateNotificationActions();
             }
         };