media: Add GLES2DecoderHelper

media/gpu/command_buffer_helper.h

Index: media/gpu/command_buffer_helper.h
diff --git a/media/gpu/command_buffer_helper.h b/media/gpu/command_buffer_helper.h
new file mode 100644
index 0000000000000000000000000000000000000000..11f52ef8f124daa15b88b1c09f0dead07067796f
--- /dev/null
+++ b/media/gpu/command_buffer_helper.h
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+// Copyright 2017 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 MEDIA_GPU_COMMAND_BUFFER_HELPER_H_
+#define MEDIA_GPU_COMMAND_BUFFER_HELPER_H_
+
+#include <stdint.h>
+
+#include <memory>
+
+#include "base/memory/ref_counted.h"
+#include "base/optional.h"
+#include "media/gpu/media_gpu_export.h"
+#include "ui/gl/gl_bindings.h"
+
+namespace gpu {
+class GpuCommandBufferStub;
+struct Mailbox;
+struct SyncToken;
+namespace gles2 {
+class TextureRef;
+}  // namespace gles2
+}  // namespace gpu
+
+namespace media {
+
+// Utility methods to simplify working with a gpu::GpuCommandBufferStub from
+// inside VDAs.
+class MEDIA_GPU_EXPORT CommandBufferHelper {
+ public:
+  static std::unique_ptr<CommandBufferHelper> Create(
+      gpu::GpuCommandBufferStub* stub);
+
+  virtual ~CommandBufferHelper() {}
+
+  // TODO(sandersd): Provide scoped version?
+  virtual bool MakeContextCurrent() = 0;
+
+  // Creates a texture and configures it as a video frame (linear filtering,
+  // clamp to edge, no mipmaps). The context must be current.
+  //
+  // See glTexImage2D() for parameter definitions.
+  //
+  // Returns nullptr on failure.
+  virtual scoped_refptr<gpu::gles2::TextureRef> CreateTexture(
+      GLenum target,
+      GLenum internal_format,
+      GLsizei width,
+      GLsizei height,
+      GLenum format,
+      GLenum type) = 0;
+
+  // Creates a sync token that has already been verified and released.
+  virtual base::Optional<gpu::SyncToken> CreateSyncToken() = 0;
+
+  // Creates a mailbox for a texture.
+  virtual base::Optional<gpu::Mailbox> CreateMailbox(
+      gpu::gles2::TextureRef* texture_ref) = 0;
+};
+
+}  // namespace media
+
+#endif  // MEDIA_GPU_COMMAND_BUFFER_HELPER_H_