Add class GrGLTextureRenderTarget for GL texture/rendertarget objects

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
 
 #include "GrResourceKey.h"
 #include "GrTypesPriv.h"
 #include "SkInstCnt.h"
 #include "SkTInternalLList.h"
 
+class GrContext;
+class GrGpu;
+class GrResourceCache2;
 class GrResourceCacheEntry;
-class GrResourceCache2;
-class GrGpu;
-class GrContext;
 
 /**
  * Base class for GrGpuResource. Handles the various types of refs we need. Separated out as a base
  * class to isolate the ref-cnting behavior and provide friendship without exposing all of
  * GrGpuResource.
  * 
  * Gpu resources can have three types of refs:
  *   1) Normal ref (+ by ref(), - by unref()): These are used by code that is issuing draw calls
  *      that read and write the resource via GrDrawTarget and by any object that must own a
  *      GrGpuResource and is itself owned (directly or indirectly) by Skia-client code.
@@ skipping 228 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