Make not-reusing-scratch-textures only apply to texture uploads

src/gpu/GrClipMaskManager.h

Index: src/gpu/GrClipMaskManager.h
===================================================================
--- src/gpu/GrClipMaskManager.h	(revision 12025)
+++ src/gpu/GrClipMaskManager.h	(working copy)
@@ -121,10 +121,11 @@
 
     // Gets a texture to use for the clip mask. If true is returned then a cached mask was found
     // that already contains the rasterization of the clip stack, otherwise an uninitialized texture
-    // is returned.
+    // is returned. 'willUpload' is set when the alpha mask needs to be uploaded from the CPU.
     bool getMaskTexture(int32_t clipStackGenID,
                         const SkIRect& clipSpaceIBounds,
-                        GrTexture** result);
+                        GrTexture** result,
+                        bool willUpload);
 
     bool useSWOnlyPath(const GrReducedClip::ElementList& elements);