WindowStateAnimation: Clear transformation clip rect.

Ensure the clip rect taken from transformations is cleared
when there is no transformation. Normally the failure to
clear the clip would not cause a problem, as the final clip
would be equal to the window size. However, in the event that
the window scale goes on to change (WindowState::m(H/V)Scale that is)
the clip will now be specified at the inappropriate scale (notice the
way the clip must be divided by H/VScale as SurfaceFlinger will apply
the surface transform to the clip).

Bug:23974105
Change-Id: I4548e8ecea8d66d4942e99823653a7b05f87cea0

services/core/java/com/android/server/wm/WindowStateAnimator.java

@@ -1087,6 +1087,8 @@ class WindowStateAnimator {
                 mAnimator.getScreenRotationAnimationLocked(displayId);
         final boolean screenAnimation =
                 screenRotationAnimation != null && screenRotationAnimation.isAnimating();
+
+        mHasClipRect = false;
         if (selfTransformation || attachedTransformation != null
                 || appTransformation != null || screenAnimation) {
             // cache often used attributes locally
@@ -1165,7 +1167,6 @@ class WindowStateAnimator {
             // transforming since it is more important to have that
             // animation be smooth.
             mShownAlpha = mAlpha;
-            mHasClipRect = false;
             if (!mService.mLimitedAlphaCompositing
                     || (!PixelFormat.formatHasAlpha(mWin.mAttrs.format)
                     || (mWin.isIdentityMatrix(mDsDx, mDtDx, mDsDy, mDtDy)