Remove gpu-side clip mask merging from clip mask manager

src/gpu/GrClipMaskManager.h

Index: src/gpu/GrClipMaskManager.h
diff --git a/src/gpu/GrClipMaskManager.h b/src/gpu/GrClipMaskManager.h
index b0e9b4f943e5a2cf36109ea792bccfda90df39d7..2d9816c84ccbcc3cafaaa27af7a09ac08db70a50 100644
--- a/src/gpu/GrClipMaskManager.h
+++ b/src/gpu/GrClipMaskManager.h
@@ -21,6 +21,7 @@
 class GrDrawTarget;
 class GrPathRenderer;
 class GrPathRendererChain;
+class GrResourceProvider;
 class GrTexture;
 class SkPath;
 
@@ -72,6 +73,8 @@ public:
 
 private:
     inline GrContext* getContext();
+    inline const GrCaps* caps() const;
+    inline GrResourceProvider* resourceProvider();
 
     /**
      * Informs the helper function adjustStencilParams() about how the stencil
@@ -134,15 +137,6 @@ private:
                      const SkClipStack::Element*,
                      GrPathRenderer* pr = nullptr);
 
-    void mergeMask(GrPipelineBuilder*,
-                   GrTexture* dstMask,
-                   GrTexture* srcMask,
-                   SkRegion::Op op,
-                   const SkIRect& dstBound,
-                   const SkIRect& srcBound);
-
-    GrTexture* createTempMask(int width, int height);
-
     /**
      * Called prior to return control back the GrGpu in setupClipping. It updates the
      * GrPipelineBuilder with stencil settings that account for stencil-based clipping.