Use GrResourceCache2 to service content key lookups

include/gpu/GrGpuResource.h

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrGpuResource_DEFINED
 #define GrGpuResource_DEFINED
 
@@ skipping 154 matching lines @@
 
     /**
      * Retrieves the amount of GPU memory used by this resource in bytes. It is
      * approximate since we aren't aware of additional padding or copies made
      * by the driver.
      *
      * @return the amount of GPU memory used in bytes
      */
     virtual size_t gpuMemorySize() const = 0;
 
-    void setCacheEntry(GrResourceCacheEntry* cacheEntry) { fCacheEntry = cacheEntry; }
+    bool setCacheEntry(GrResourceCacheEntry* cacheEntry);
     GrResourceCacheEntry* getCacheEntry() const { return fCacheEntry; }
     bool isScratch() const;
 
     /** 
      * If this resource can be used as a scratch resource this returns a valid
      * scratch key. Otherwise it returns a key for which isNullScratch is true.
      */
     const GrResourceKey& getScratchKey() const { return fScratchKey; }
 
     /** 
@@ skipping 72 matching lines @@
     GrResourceCacheEntry*   fCacheEntry;  // NULL if not in cache
     const uint32_t          fUniqueID;
 
     GrResourceKey           fScratchKey;
 
     typedef GrIORef<GrGpuResource> INHERITED;
     friend class GrIORef<GrGpuResource>; // to access notifyIsPurgable.
 };
 
 #endif