[Chromoting] Add InputInjector and InputInjectorWrapper for easy unittesting

remoting/android/java/src/org/chromium/chromoting/jni/Client.java

Index: remoting/android/java/src/org/chromium/chromoting/jni/Client.java
diff --git a/remoting/android/java/src/org/chromium/chromoting/jni/Client.java b/remoting/android/java/src/org/chromium/chromoting/jni/Client.java
index d66db9810c258712646b49483e19289b06441d4f..628573a0162934586f2d3f5d58396c918c06eba8 100644
--- a/remoting/android/java/src/org/chromium/chromoting/jni/Client.java
+++ b/remoting/android/java/src/org/chromium/chromoting/jni/Client.java
@@ -8,6 +8,7 @@ import org.chromium.base.annotations.CalledByNative;
 import org.chromium.base.annotations.JNINamespace;
 import org.chromium.base.annotations.SuppressFBWarnings;
 import org.chromium.chromoting.CapabilityManager;
+import org.chromium.chromoting.InputStub;
 import org.chromium.chromoting.SessionAuthenticator;
 
 /**
@@ -18,7 +19,7 @@ import org.chromium.chromoting.SessionAuthenticator;
  * This class is used entirely on the UI thread.
  */
 @JNINamespace("remoting")
-public class Client {
+public class Client implements InputStub {
     // Pointer to the C++ object, cast to a |long|.
     private long mNativeJniClient;