Remove separate cache for clip mask textures

src/gpu/GrResourceProvider.h

Index: src/gpu/GrResourceProvider.h
diff --git a/src/gpu/GrResourceProvider.h b/src/gpu/GrResourceProvider.h
index 33a9f3bd1240be6e3ae90830f4932f2448511ae6..a709c7056481e1c4e673c7604e9b8ab893a19f2b 100644
--- a/src/gpu/GrResourceProvider.h
+++ b/src/gpu/GrResourceProvider.h
@@ -90,6 +90,7 @@ public:
 
     using GrTextureProvider::assignUniqueKeyToResource;
     using GrTextureProvider::findAndRefResourceByUniqueKey;
+    using GrTextureProvider::findAndRefTextureByUniqueKey;
     using GrTextureProvider::abandon;
 
     enum Flags {
@@ -142,6 +143,8 @@ public:
      */
     GrStencilAttachment* attachStencilAttachment(GrRenderTarget* rt);
 
+    const GrCaps* caps() { return this->gpu()->caps(); }
+
 private:
     const GrIndexBuffer* createInstancedIndexBuffer(const uint16_t* pattern,
                                                     int patternSize,