skia: Add support for CHROMIUM_image backed textures.

src/gpu/GrGpuResource.cpp

 
 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrGpuResource.h"
 #include "GrContext.h"
@@ skipping 55 matching lines @@
     if (this->isPurgeable()) {
         traceMemoryDump->dumpNumericValue(dumpName.c_str(), "purgeable_size", "bytes",
                                           this->gpuMemorySize());
     }
 
     // Call setMemoryBacking to allow sub-classes with implementation specific backings (such as GL
     // objects) to provide additional information.
     this->setMemoryBacking(traceMemoryDump, dumpName);
 }
 
+bool GrGpuResource::reuseable() const {
+    return true;
+}
+
 const SkData* GrGpuResource::setCustomData(const SkData* data) {
     SkSafeRef(data);
     fData.reset(data);
     return data;
 }
 
 const GrContext* GrGpuResource::getContext() const {
     if (fGpu) {
         return fGpu->getContext();
     } else {
@@ skipping 112 matching lines @@
 }
 
 uint32_t GrGpuResource::CreateUniqueID() {
     static int32_t gUniqueID = SK_InvalidUniqueID;
     uint32_t id;
     do {
         id = static_cast<uint32_t>(sk_atomic_inc(&gUniqueID) + 1);
     } while (id == SK_InvalidUniqueID);
     return id;
 }