Cache render targets that render to wrapped textures

src/gpu/GrResourceProvider.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrResourceProvider_DEFINED
 #define GrResourceProvider_DEFINED
 
@@ skipping 74 matching lines @@
      * Factories for GrPath and GrPathRange objects. It's an error to call these if path rendering
      * is not supported.
      */
     GrPath* createPath(const SkPath&, const GrStrokeInfo&);
     GrPathRange* createPathRange(GrPathRange::PathGenerator*, const GrStrokeInfo&);
     GrPathRange* createGlyphs(const SkTypeface*, const SkDescriptor*, const GrStrokeInfo&);
 
     using GrTextureProvider::assignUniqueKeyToResource;
     using GrTextureProvider::findAndRefResourceByUniqueKey;
     using GrTextureProvider::findAndRefTextureByUniqueKey;
+    using GrTextureProvider::findAndRefRenderTargetByUniqueKey;
     using GrTextureProvider::abandon;
 
     enum Flags {
         /** If the caller intends to do direct reads/writes to/from the CPU then this flag must be
          *  set when accessing resources during a GrDrawTarget flush. This includes the execution of
          *  GrBatch objects. The reason is that these memory operations are done immediately and
          *  will occur out of order WRT the operations being flushed.
          *  Make this automatic: https://bug.skia.org/4156
          */
         kNoPendingIO_Flag = kNoPendingIO_ScratchTextureFlag,
@@ skipping 59 matching lines @@
                                                     const GrUniqueKey& key);
 
     const GrIndexBuffer* createQuadIndexBuffer();
 
     GrUniqueKey fQuadIndexBufferKey;
 
     typedef GrTextureProvider INHERITED;
 };
 
 #endif