[Chromoting] Add InputInjector and InputInjectorWrapper for easy unittesting

remoting/android/java/src/org/chromium/chromoting/TouchInputHandlerInterface.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 org.chromium.chromoting.jni.Client;
-
-/**
- * This interface allows multiple styles of touchscreen UI to be implemented and dynamically
- * switched. The DesktopView passes the low-level touchscreen events and other events via this
- * interface. The implementation recognizes and processes the touchscreen gestures, and then
- * performs actions on the DesktopView (such as panning/zooming the display, injecting input, or
- * showing/hiding UI elements). All methods are called on the main UI thread.
- */
-public interface TouchInputHandlerInterface {
-    // These constants must match those in the generated struct protocol::MouseEvent_MouseButton.
-    int BUTTON_UNDEFINED = 0;
-    int BUTTON_LEFT = 1;
-    int BUTTON_MIDDLE = 2;
-    int BUTTON_RIGHT = 3;
-
-    /**
-     * 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);
-
-    /**
-     * Whilst an animation is in progress, this method is called repeatedly until the animation is
-     * cancelled. After this method returns, the DesktopView will schedule a repaint.
-     */
-    void processAnimation();
-}