Cache render targets that render to wrapped textures

include/gpu/GrTextureProvider.h

Index: include/gpu/GrTextureProvider.h
diff --git a/include/gpu/GrTextureProvider.h b/include/gpu/GrTextureProvider.h
index 7c12ebd6db36152535185c8e15d05d7839e937be..d40c95c62ca9d431937cd132eda59cb53e629ed9 100644
--- a/include/gpu/GrTextureProvider.h
+++ b/include/gpu/GrTextureProvider.h
@@ -57,6 +57,10 @@ public:
     /** Finds a texture by unique key. If the texture is found it is ref'ed and returned. */
     GrTexture* findAndRefTextureByUniqueKey(const GrUniqueKey& key);
 
+    /** Finds a render target by unique key. If the render target is found it is ref'ed and
+     * returned. */
+    GrRenderTarget* findAndRefRenderTargetByUniqueKey(const GrUniqueKey& key);
+
     /**
      * Determines whether a texture is associated with the unique key. If the texture is found it
      * will not be locked or returned. This call does not affect the priority of the resource for