Send POWER_HINT_INTERACTION on rotate.

Send a POWER_HINT_INTERACTION to improve redraw performance when the
phone is rotated.

bug 24583227

Change-Id: I1978f0dfb9a25c00ad4da5b44d10410ad7412001

services/core/java/com/android/server/policy/PhoneWindowManager.java

@@ -767,6 +767,8 @@ public class PhoneWindowManager implements WindowManagerPolicy {
         private final Runnable mUpdateRotationRunnable = new Runnable() {
             @Override
             public void run() {
+                // send interaction hint to improve redraw performance
+                mPowerManagerInternal.powerHint(PowerManagerInternal.POWER_HINT_INTERACTION, 0);
                 updateRotation(false);
             }
         };