Prioritize reveal clipping over Outline clipping

bug:15780987
bug:17350602

Also update docs around clipping nesting behavior,
and some Z ordering behavior.

Change-Id: Iaa204350a0adfdcbd8c4b821fb4a9c0ae22f2613
diff --git a/libs/hwui/StatefulBaseRenderer.cpp b/libs/hwui/StatefulBaseRenderer.cpp
index 3e1aed3..12b8c8d 100644
--- a/libs/hwui/StatefulBaseRenderer.cpp
+++ b/libs/hwui/StatefulBaseRenderer.cpp
@@ -198,13 +198,13 @@
         clipRect(bounds.left, bounds.top, bounds.right, bounds.bottom, SkRegion::kIntersect_Op);
     }
     if (outlineIsRounded) {
-        setClippingRoundRect(allocator, bounds, radius);
+        setClippingRoundRect(allocator, bounds, radius, false);
     }
 }
 
 void StatefulBaseRenderer::setClippingRoundRect(LinearAllocator& allocator,
-        const Rect& rect, float radius) {
-    mSnapshot->setClippingRoundRect(allocator, rect, radius);
+        const Rect& rect, float radius, bool highPriority) {
+    mSnapshot->setClippingRoundRect(allocator, rect, radius, highPriority);
 }