Add half-float IOSurface GpuMemoryBuffer support

gpu/command_buffer/common/gpu_memory_buffer_support.h

 // Copyright 2016 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 GPU_COMMAND_BUFFER_COMMON_GPU_MEMORY_BUFFER_SUPPORT_H_
 #define GPU_COMMAND_BUFFER_COMMON_GPU_MEMORY_BUFFER_SUPPORT_H_
 
 #include "gpu/gpu_export.h"
 #include "ui/gfx/buffer_types.h"
 #include "ui/gfx/geometry/size.h"
 #include "ui/gfx/gpu_memory_buffer.h"
 
 namespace gpu {
 
 struct Capabilities;
 
 // Returns a valid GpuMemoryBuffer format given a valid internalformat as
 // defined by CHROMIUM_image.
 GPU_EXPORT gfx::BufferFormat DefaultBufferFormatForImageFormat(
     unsigned internalformat);
 
 // Returns true if |internalformat| is compatible with |format|.
 GPU_EXPORT bool IsImageFormatCompatibleWithGpuMemoryBufferFormat(
     unsigned internalformat,
     gfx::BufferFormat format);
 
 // Returns true if |format| is supported by |capabilities|.
-GPU_EXPORT bool IsGpuMemoryBufferFormatSupported(
+GPU_EXPORT bool IsImageFromGpuMemoryBufferFormatSupported(

[reveman, 2017/04/11 16:28:26]

nit: can update the comment above too? "Returns true if creating an image for a
GpuMemoryBuffer with |format| is supported by |capabilities|."

[ccameron, 2017/04/12 05:34:35]

Done.

     gfx::BufferFormat format,
     const Capabilities& capabilities);
 
 // Returns true if |size| is valid for |format|.
 GPU_EXPORT bool IsImageSizeValidForGpuMemoryBufferFormat(
     const gfx::Size& size,
     gfx::BufferFormat format);
 
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_COMMON_GPU_MEMORY_BUFFER_SUPPORT_H_