Add postMessage APIs to the support lib

customtabs/src/android/support/customtabs/CustomTabsSessionToken.java

 /*
  * Copyright (C) 2015 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
 
 package android.support.customtabs;
 
 import android.content.Intent;
+import android.net.Uri;
 import android.os.Bundle;
 import android.os.IBinder;
 import android.os.RemoteException;
 import android.support.v4.app.BundleCompat;
 import android.util.Log;
 
 /**
  * Wrapper class that can be used as a unique identifier for a session. Also contains an accessor
  * for the {@link CustomTabsCallback} for the session if there was any.
  */
 public class CustomTabsSessionToken {
     private static final String TAG = "CustomTabsSessionToken";
     private final ICustomTabsCallback mCallbackBinder;
     private final CustomTabsCallback mCallback;
 
     /* package */ static class DummyCallback extends ICustomTabsCallback.Stub {
         @Override
         public void onNavigationEvent(int navigationEvent, Bundle extras) {}
 
         @Override
+        public void onMessageChannelReady(Uri origin, Bundle extras) {}
+
+        @Override
+        public void onPostMessage(String message, Bundle extras) {}
+
+        @Override
         public void extraCallback(String callbackName, Bundle args) {}
 
         @Override
         public IBinder asBinder() {
             return this;
         }
     }
 
     /**
      * Obtain a {@link CustomTabsSessionToken} from an intent. See {@link CustomTabsIntent.Builder}
@@ skipping 27 matching lines @@
             @Override
             public void onNavigationEvent(int navigationEvent, Bundle extras) {
                 try {
                     mCallbackBinder.onNavigationEvent(navigationEvent, extras);
                 } catch (RemoteException e) {
                     Log.e(TAG, "RemoteException during ICustomTabsCallback transaction");
                 }
             }
 
             @Override
+            public void onMessageChannelReady(Uri origin, Bundle extras) {

[Benoit L, 2016/11/08 16:27:07]

If we do need the extra synchronization for this method as well (see the comment
below), then we should make it synchronized as well.

+                try {
+                    mCallbackBinder.onMessageChannelReady(origin, extras);
+                } catch (RemoteException e) {
+                    Log.e(TAG, "RemoteException during ICustomTabsCallback transaction");
+                }
+            }
+
+            @Override
+            public synchronized void onPostMessage(String message, Bundle extras) {
+                try {
+                    mCallbackBinder.onPostMessage(message, extras);
+                } catch (RemoteException e) {
+                    Log.e(TAG, "RemoteException during ICustomTabsCallback transaction");
+                }
+            }
+
+            @Override
             public void extraCallback(String callbackName, Bundle args) {
                 try {
                     mCallbackBinder.extraCallback(callbackName, args);
                 } catch (RemoteException e) {
                     Log.e(TAG, "RemoteException during ICustomTabsCallback transaction");
                 }
             }
         };
     }
 
@@ skipping 15 matching lines @@
     }
 
     /**
      * @return {@link CustomTabsCallback} corresponding to this session if there was any non-null
      *         callbacks passed by the client.
      */
     public CustomTabsCallback getCallback() {
         return mCallback;
     }
 }