Add a service to handle postMessage callbacks to client

customtabs/src/android/support/customtabs/CustomTabsClient.java

Index: customtabs/src/android/support/customtabs/CustomTabsClient.java
diff --git a/customtabs/src/android/support/customtabs/CustomTabsClient.java b/customtabs/src/android/support/customtabs/CustomTabsClient.java
index 84cf46374ca39798272f7503a1646ff881945e3d..52cc732625089461e80f8902e8203fd7ac44a82c 100644
--- a/customtabs/src/android/support/customtabs/CustomTabsClient.java
+++ b/customtabs/src/android/support/customtabs/CustomTabsClient.java
@@ -125,7 +125,7 @@ public class CustomTabsClient {
      * necessary.
      *
      * @param context     {@link Context} to use to connect to the remote service.
-     * @param packageName Package name of the target implamentation.
+     * @param packageName Package name of the target implementation.
      * @return Whether the binding was successful.
      */
     public static boolean connectAndInitialize(Context context, String packageName) {
@@ -196,35 +196,37 @@ public class CustomTabsClient {
             }
 
             @Override
-            public synchronized void onMessageChannelReady(final Uri origin, final Bundle extras) {
+            public void extraCallback(final String callbackName, final Bundle args)
+                    throws RemoteException {
                 if (callback == null) return;
                 mHandler.post(new Runnable() {
                     @Override
                     public void run() {
-                        callback.onMessageChannelReady(origin, extras);
+                        callback.extraCallback(callbackName, args);
                     }
                 });
             }
 
             @Override
-            public synchronized void onPostMessage(final String message, final Bundle extras) {
+            public void onMessageChannelReady(final Bundle extras)
+                    throws RemoteException {
                 if (callback == null) return;
                 mHandler.post(new Runnable() {
                     @Override
                     public void run() {
-                        callback.onPostMessage(message, extras);
+                        callback.onMessageChannelReady(extras);
                     }
                 });
             }
 
             @Override
-            public void extraCallback(final String callbackName, final Bundle args)
+            public void onPostMessage(final String message, final Bundle extras)
                     throws RemoteException {
                 if (callback == null) return;
                 mHandler.post(new Runnable() {
                     @Override
                     public void run() {
-                        callback.extraCallback(callbackName, args);
+                        callback.onPostMessage(message, extras);
                     }
                 });
             }