Frame rate to 48 fps

Change-Id: I95645b3921db22dfeca97ad2743299ccda5de83b

Author: Dave Burke

services/java/com/android/server/wm/WindowManagerService.java

@@ -226,6 +226,11 @@ public class WindowManagerService extends IWindowManager.Stub
      */
     static final int DEFAULT_FADE_IN_OUT_DURATION = 400;
 
+    /**
+     * Frame rate. TODO: Replace with Display.getRefreshRate() when that is reliable.
+     */
+    static final int FRAME_RATE = 48;
+
     /**
      * If true, the window manager will do its own custom freezing and general
      * management of the screen during rotation.
@@ -8660,7 +8665,7 @@ private final void performLayoutAndPlaceSurfacesLockedInner(
         if (needRelayout) {
             requestAnimationLocked(0);
         } else if (animating) {
-            requestAnimationLocked(currentTime+(1000/60)-SystemClock.uptimeMillis());
+            requestAnimationLocked(currentTime+(1000/FRAME_RATE)-SystemClock.uptimeMillis());
         }
 
         // Finally update all input windows now that the window changes have stabilized.