gpu: Move native memory buffer configuration into //gpu

gpu/ipc/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_IPC_COMMON_GPU_MEMORY_BUFFER_SUPPORT_H_
 #define GPU_IPC_COMMON_GPU_MEMORY_BUFFER_SUPPORT_H_
 
+#include "base/containers/hash_tables.h"
+#include "base/hash.h"
 #include "gpu/gpu_export.h"
 #include "ui/gfx/buffer_types.h"
 #include "ui/gfx/gpu_memory_buffer.h"
 
 namespace gpu {
 
+using GpuMemoryBufferConfigurationKey =
+    std::pair<gfx::BufferFormat, gfx::BufferUsage>;
+using GpuMemoryBufferConfigurationSet =
+    base::hash_set<GpuMemoryBufferConfigurationKey>;
+
+}  // namespace gpu
+
+namespace BASE_HASH_NAMESPACE {
+
+template <>
+struct hash<gpu::GpuMemoryBufferConfigurationKey> {
+  size_t operator()(const gpu::GpuMemoryBufferConfigurationKey& key) const {
+    return base::HashInts(static_cast<int>(key.first),
+                          static_cast<int>(key.second));
+  }
+};
+
+}  // namespace BASE_HASH_NAMESPACE
+
+namespace gpu {
+
+GPU_EXPORT bool AreNativeGpuMemoryBuffersEnabled();
+
 // Returns the native GPU memory buffer factory type. Returns EMPTY_BUFFER
 // type if native buffers are not supported.
 GPU_EXPORT gfx::GpuMemoryBufferType GetNativeGpuMemoryBufferType();
 
 // Returns whether the provided buffer format is supported.
 GPU_EXPORT bool IsNativeGpuMemoryBufferConfigurationSupported(
     gfx::BufferFormat format,
     gfx::BufferUsage usage);
 
+// Returns the set of supported configurations.
+GPU_EXPORT GpuMemoryBufferConfigurationSet
+GetNativeGpuMemoryBufferConfigurations();
+
 }  // namespace gpu
 
 #endif  // GPU_IPC_COMMON_GPU_MEMORY_BUFFER_SUPPORT_H_