Add PERSISTENT_MAP usage for GpuMemoryBuffers.

content/common/gpu/gpu_memory_buffer_factory.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_COMMON_GPU_GPU_MEMORY_BUFFER_FACTORY_H_
 #define CONTENT_COMMON_GPU_GPU_MEMORY_BUFFER_FACTORY_H_
 
 #include <vector>
 
 #include "base/memory/ref_counted.h"
@@ skipping 17 matching lines @@
  public:
   struct Configuration {
     gfx::GpuMemoryBuffer::Format format;
     gfx::GpuMemoryBuffer::Usage usage;
   };
 
   virtual ~GpuMemoryBufferFactory() {}
 
   // Gets system supported GPU memory buffer factory types. Preferred type at
   // the front of vector.
-  static void GetSupportedTypes(std::vector<gfx::GpuMemoryBufferType>* types);
+  static void GetSupportedTypes(gfx::GpuMemoryBuffer::Usage usage,
+                                std::vector<gfx::GpuMemoryBufferType>* types);

[reveman, 2015/05/19 16:12:12]

I'd rather not change this function. It might be removed in the near future and
the current idea is that it shouldn't take format or usage into account. Let me
know if using IsGpuMemoryBufferConfigurationSupported in GetImageTextureTarget
doesn't solve this problem.

 
   // Creates a new factory instance for |type|.
   static scoped_ptr<GpuMemoryBufferFactory> Create(
       gfx::GpuMemoryBufferType type);
 
   // Gets supported format/usage configurations.
   virtual void GetSupportedGpuMemoryBufferConfigurations(
       std::vector<Configuration>* configurations) = 0;
 
   // Creates a new GPU memory buffer instance. A valid handle is returned on
@@ skipping 17 matching lines @@
  protected:
   GpuMemoryBufferFactory() {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(GpuMemoryBufferFactory);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_GPU_MEMORY_BUFFER_FACTORY_H_