Start using RenderTargetProxy (omnibus)

include/private/GrTextureProxy.h

Index: include/private/GrTextureProxy.h
diff --git a/include/private/GrTextureProxy.h b/include/private/GrTextureProxy.h
index 75f09de80027d0facf784f1bdd67c6cbc5617d65..2693740c066f161024338a687ab069ca93a15d08 100644
--- a/include/private/GrTextureProxy.h
+++ b/include/private/GrTextureProxy.h
@@ -30,6 +30,21 @@ public:
     // Actually instantiate the backing texture, if necessary
     GrTexture* instantiate(GrTextureProvider*);
 
+    // dispreferred entry point
+    GrContext* getContext() { return nullptr; } // fTexture->getContext(); }
+
+    bool readPixels(int left, int top, int width, int height,
+                    GrPixelConfig config,
+                    void* buffer,
+                    size_t rowBytes = 0,
+                    uint32_t pixelOpsFlags = 0);
+
+    bool writePixels(int left, int top, int width, int height,
+                     GrPixelConfig config,
+                     const void* buffer,
+                     size_t rowBytes = 0,
+                     uint32_t pixelOpsFlags = 0);
+
 protected:
     // Deferred version
     GrTextureProxy(const GrSurfaceDesc& srcDesc, SkBackingFit, SkBudgeted,