GrResourceCache2 manages scratch texture.

src/gpu/GrClipMaskCache.h

Index: src/gpu/GrClipMaskCache.h
diff --git a/src/gpu/GrClipMaskCache.h b/src/gpu/GrClipMaskCache.h
index 6b484e8af83e15918b63a53704f34ab26de42378..a2495f15662afaafb90f91c4a7a1d1cffbef136e 100644
--- a/src/gpu/GrClipMaskCache.h
+++ b/src/gpu/GrClipMaskCache.h
@@ -204,7 +204,9 @@ private:
 
             fLastClipGenID = clipGenID;
 
-            fLastMask.set(context, desc);
+            // HACK: set the last param to true to indicate that this request is at
+            // flush time and therefore we require a scratch texture with no pending IO operations.
+            fLastMask.set(context, desc, GrContext::kApprox_ScratchTexMatch, /*flushing=*/true);
 
             fLastBound = bound;
         }