Remove the AA requirement for selecting GrEffect-based clipping.

src/gpu/GrClipMaskManager.h

Index: src/gpu/GrClipMaskManager.h
diff --git a/src/gpu/GrClipMaskManager.h b/src/gpu/GrClipMaskManager.h
index c3a21fd8a2b1e9d6771ebde48bbdaa2731b28b85..974c217705c28609f121f4c15719937b11dbbada 100644
--- a/src/gpu/GrClipMaskManager.h
+++ b/src/gpu/GrClipMaskManager.h
@@ -106,11 +106,14 @@ private:
     GrClipMaskCache fAACache;       // cache for the AA path
 
     // Attempts to install a series of coverage effects to implement the clip. Return indicates
-    // whether the element list was successfully converted to effects.
+    // whether the element list was successfully converted to effects. One of the elements may
+    // be selected to use the scissor. If so scissorRect will be updated to a valid rectangle
+    // that the caller should set as the scissor rect. If not, scissorRect won't be modified.
     bool installClipEffects(const GrReducedClip::ElementList&,
                             GrDrawState::AutoRestoreEffects*,
                             const SkVector& clipOffset,
-                            const SkRect* devBounds);
+                            const SkRect* devBounds,
+                            SkIRect* scissorRect);
 
     // Draws the clip into the stencil buffer
     bool createStencilClipMask(int32_t elementsGenID,