Avoid re-rendering stencil clip for every draw with reducable clip stack

src/gpu/GrClipMaskManager.h

Index: src/gpu/GrClipMaskManager.h
diff --git a/src/gpu/GrClipMaskManager.h b/src/gpu/GrClipMaskManager.h
index 015c801d547f1fd3be6cd5ea4cf83c7da0ea5446..f44a8e7b227499c6b81671526bcba9276a208fc3 100644
--- a/src/gpu/GrClipMaskManager.h
+++ b/src/gpu/GrClipMaskManager.h
@@ -103,18 +103,19 @@ private:
     GrClipMaskCache fAACache;       // cache for the AA path
 
     // Draws the clip into the stencil buffer
-    bool createStencilClipMask(GrReducedClip::InitialState initialState,
+    bool createStencilClipMask(int32_t elementsGenID,
+                               GrReducedClip::InitialState initialState,
                                const GrReducedClip::ElementList& elements,
                                const SkIRect& clipSpaceIBounds,
                                const SkIPoint& clipSpaceToStencilOffset);
     // Creates an alpha mask of the clip. The mask is a rasterization of elements through the
     // rect specified by clipSpaceIBounds.
-    GrTexture* createAlphaClipMask(int32_t clipStackGenID,
+    GrTexture* createAlphaClipMask(int32_t elementsGenID,
                                    GrReducedClip::InitialState initialState,
                                    const GrReducedClip::ElementList& elements,
                                    const SkIRect& clipSpaceIBounds);
     // Similar to createAlphaClipMask but it rasterizes in SW and uploads to the result texture.
-    GrTexture* createSoftwareClipMask(int32_t clipStackGenID,
+    GrTexture* createSoftwareClipMask(int32_t elementsGenID,
                                       GrReducedClip::InitialState initialState,
                                       const GrReducedClip::ElementList& elements,
                                       const SkIRect& clipSpaceIBounds);
@@ -122,7 +123,7 @@ private:
     // 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. 'willUpload' is set when the alpha mask needs to be uploaded from the CPU.
-    bool getMaskTexture(int32_t clipStackGenID,
+    bool getMaskTexture(int32_t elementsGenID,
                         const SkIRect& clipSpaceIBounds,
                         GrTexture** result,
                         bool willUpload);