Snap the clip rectangle to pixel boundaries.

Change-Id: Iac2765303552f385995fe46e219af456e0501da7
diff --git a/libs/hwui/Snapshot.h b/libs/hwui/Snapshot.h
index 062c986..c736a1c 100644
--- a/libs/hwui/Snapshot.h
+++ b/libs/hwui/Snapshot.h
@@ -141,6 +141,7 @@
         }
 
         if (clipped) {
+            clipRect->snapToPixelBoundaries();
             flags |= Snapshot::kFlagClipSet | Snapshot::kFlagDirtyLocalClip;
         }