[Chromoting] Add InputInjector and InputInjectorWrapper for easy unittesting

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

Index: remoting/android/java/src/org/chromium/chromoting/TrackpadInputStrategy.java
diff --git a/remoting/android/java/src/org/chromium/chromoting/TrackpadInputStrategy.java b/remoting/android/java/src/org/chromium/chromoting/TrackpadInputStrategy.java
index c9dcf4bdaf1745ccc1791fe2f11c3c565d4b1f36..16f7277d0423ea4a444eb359d2416c794147786c 100644
--- a/remoting/android/java/src/org/chromium/chromoting/TrackpadInputStrategy.java
+++ b/remoting/android/java/src/org/chromium/chromoting/TrackpadInputStrategy.java
@@ -7,8 +7,6 @@ package org.chromium.chromoting;
 import android.graphics.Point;
 import android.view.MotionEvent;
 
-import org.chromium.chromoting.jni.Client;
-
 /**
  * Defines a set of behavior and methods to simulate trackpad behavior when responding to
  * local input event data.  This class is also responsible for forwarding input event data
@@ -16,14 +14,15 @@ import org.chromium.chromoting.jni.Client;
  */
 public class TrackpadInputStrategy implements InputStrategyInterface {
     private final RenderData mRenderData;
-    private final Client mClient;
+    private final InputEventSender mInjector;
 
     /** Mouse-button currently held down, or BUTTON_UNDEFINED otherwise. */
-    private int mHeldButton = TouchInputHandlerInterface.BUTTON_UNDEFINED;
+    private int mHeldButton = InputStub.BUTTON_UNDEFINED;
 
-    public TrackpadInputStrategy(RenderData renderData, Client client) {
+    public TrackpadInputStrategy(RenderData renderData, InputEventSender injector) {
+        Preconditions.notNull(injector);
         mRenderData = renderData;
-        mClient = client;
+        mInjector = injector;
 
         synchronized (mRenderData) {
             mRenderData.drawCursor = true;
@@ -32,35 +31,34 @@ public class TrackpadInputStrategy implements InputStrategyInterface {
 
     @Override
     public boolean onTap(int button) {
-        injectMouseButtonEvent(button, true);
-        injectMouseButtonEvent(button, false);
+        mInjector.sendMouseClick(getCursorPosition(), button);
         return true;
     }
 
     @Override
     public boolean onPressAndHold(int button) {
-        injectMouseButtonEvent(button, true);
+        mInjector.sendMouseDown(getCursorPosition(), button);
         mHeldButton = button;
         return true;
     }
 
     @Override
     public void onScroll(float distanceX, float distanceY) {
-        mClient.sendMouseWheelEvent((int) -distanceX, (int) -distanceY);
+        mInjector.sendReverseMouseWheelEvent(distanceX, distanceY);
     }
 
     @Override
     public void onMotionEvent(MotionEvent event) {
         if (event.getActionMasked() == MotionEvent.ACTION_UP
-                && mHeldButton != TouchInputHandlerInterface.BUTTON_UNDEFINED) {
-            injectMouseButtonEvent(mHeldButton, false);
-            mHeldButton = TouchInputHandlerInterface.BUTTON_UNDEFINED;
+                && mHeldButton != InputStub.BUTTON_UNDEFINED) {
+            mInjector.sendMouseUp(getCursorPosition(), mHeldButton);
+            mHeldButton = InputStub.BUTTON_UNDEFINED;
         }
     }
 
     @Override
     public void injectCursorMoveEvent(int x, int y) {
-        mClient.sendMouseEvent(x, y, TouchInputHandlerInterface.BUTTON_UNDEFINED, false);
+        mInjector.sendCursorMove(x, y);
     }
 
     @Override
@@ -78,11 +76,9 @@ public class TrackpadInputStrategy implements InputStrategyInterface {
         return true;
     }
 
-    private void injectMouseButtonEvent(int button, boolean pressed) {
-        Point cursorPosition;
+    private Point getCursorPosition() {
         synchronized (mRenderData) {
-            cursorPosition = mRenderData.getCursorPosition();
+            return mRenderData.getCursorPosition();
         }
-        mClient.sendMouseEvent(cursorPosition.x, cursorPosition.y, button, pressed);
     }
 }