cc::SkiaRenderer hack prototype

cc/resources/resource_provider.h

Index: cc/resources/resource_provider.h
diff --git a/cc/resources/resource_provider.h b/cc/resources/resource_provider.h
index e2b97c6210489c78023f0634ff71c54802db685f..54c308c686ae4cec550eaa9a84b878e61e2d179a 100644
--- a/cc/resources/resource_provider.h
+++ b/cc/resources/resource_provider.h
@@ -222,13 +222,14 @@ class CC_EXPORT ResourceProvider
     GLenum target() const { return target_; }
     const gfx::Size& size() const { return size_; }
 
-   private:
+   protected:
     ResourceProvider* resource_provider_;
     ResourceId resource_id_;
     unsigned texture_id_;
     GLenum target_;
     gfx::Size size_;
 
+   private:
     DISALLOW_COPY_AND_ASSIGN(ScopedReadLockGL);
   };
 
@@ -346,6 +347,24 @@ class CC_EXPORT ResourceProvider
     DISALLOW_COPY_AND_ASSIGN(ScopedReadLockSoftware);
   };
 
+  class CC_EXPORT ScopedReadLockSkImage {
+   public:
+    ScopedReadLockSkImage(ResourceProvider* resource_provider,
+                          ResourceId resource_id);
+    ~ScopedReadLockSkImage();
+
+    const SkImage* sk_image() const { return sk_image_.get(); }
+
+    bool valid() const { return !!sk_image_; }
+
+   private:
+    ResourceProvider* resource_provider_;
+    ResourceId resource_id_;
+    sk_sp<SkImage> sk_image_;
+
+    DISALLOW_COPY_AND_ASSIGN(ScopedReadLockSkImage);
+  };
+
   class CC_EXPORT ScopedWriteLockSoftware {
    public:
     ScopedWriteLockSoftware(ResourceProvider* resource_provider,