[Chromoting] Decouple DesktopView and TouchInputHandler

remoting/android/java/src/org/chromium/chromoting/DesktopViewInterface.java

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.chromoting;
 
 import android.graphics.Point;
 
+import org.chromium.chromoting.jni.Client;
+
 /**
  * Callback interface to allow the TouchInputHandler to request actions on the DesktopView.
  */
 public interface DesktopViewInterface {
+    /**
+     * Initializes the instance. Implementations can assume this function will be called exactly
+     * once after constructor but before other functions.
+     */
+    void init(Desktop desktop, Client client);
+
     /** Triggers a brief animation to indicate the existence and location of an input event. */
     void showInputFeedback(DesktopView.InputFeedbackType feedbackToShow, Point pos);
 
     /** Shows the action bar. */
     void showActionBar();
 
     /** Shows the software keyboard. */
     void showKeyboard();
 
     /**
      * Informs the view that its transformation matrix (for rendering the remote desktop bitmap)
      * has been changed by the TouchInputHandler, which requires repainting.
      */
     void transformationChanged();
 
     /**
      * Starts or stops an animation. Whilst the animation is running, the DesktopView will
      * periodically call TouchInputHandler.processAnimation() and repaint itself.
      */
     void setAnimationEnabled(boolean enabled);
 }