Add ViewPropertyAnimator for easy View animations

A demo in ApiDemos conflicted with the new animate() API
in View. The method was internal, so it was renamed to
avoid the conflict.

Change-Id: Id6dffc84fa0800677a0b67bee9c78f26da775d26

samples/ApiDemos/src/com/example/android/apis/view/GameView.java

@@ -71,7 +71,7 @@ public class GameView extends View {
 
     private final Runnable mAnimationRunnable = new Runnable() {
         public void run() {
-            animate();
+            animateFrame();
         }
     };
 
@@ -322,7 +322,7 @@ public class GameView extends View {
         mObstacles.clear();
     }
 
-    void animate() {
+    void animateFrame() {
         long currentStepTime = SystemClock.uptimeMillis();
         step(currentStepTime);