gpu: Add async pixel transfer interface, stub and tests.

ui/gl/async_pixel_transfer_delegate_stub.h

+// Copyright (c) 2012 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 UI_GL_ASYNC_TASK_DELEGATE_STUB_H_
+#define UI_GL_ASYNC_TASK_DELEGATE_STUB_H_
+
+#include "ui/gl/async_pixel_transfer_delegate.h"
+
+namespace gfx {
+
+class AsyncTransferStateStub : public AsyncPixelTransferState {
+ public:
+  // implement AsyncPixelTransferState:
+  virtual bool TransferIsInProgress() OVERRIDE;
+  virtual void BindTransfer(AsyncTexImage2DParams* bound_params) OVERRIDE;
+
+ private:
+  friend class AsyncPixelTransferDelegateStub;
+  bool needs_late_bind_;
+  AsyncTexImage2DParams late_bind_define_params_ ;
+
+  explicit AsyncTransferStateStub(GLuint texture_id);
+  virtual ~AsyncTransferStateStub();
+  DISALLOW_COPY_AND_ASSIGN(AsyncTransferStateStub);
+};
+
+// Class which handles async pixel transfers (as a fallback).
+// This class just does the uploads synchronously.
+class AsyncPixelTransferDelegateStub : public AsyncPixelTransferDelegate {
+ public:
+  static scoped_ptr<AsyncPixelTransferDelegate>
+      Create(gfx::GLContext* context);
+
+  AsyncPixelTransferDelegateStub();
+  virtual ~AsyncPixelTransferDelegateStub();
+
+  // implement AsyncPixelTransferDelegate:
+  virtual void AsyncNotifyCompletion(const base::Closure& task) OVERRIDE;
+  virtual void AsyncTexImage2D(
+      AsyncPixelTransferState* transfer_state,
+      const AsyncTexImage2DParams& tex_params,
+      const AsyncMemoryParams& mem_params) OVERRIDE;
+  virtual void AsyncTexSubImage2D(
+      AsyncPixelTransferState* transfer_state,
+      const AsyncTexSubImage2DParams& tex_params,
+      const AsyncMemoryParams& mem_params) OVERRIDE;
+ private:
+  // implement AsyncPixelTransferDelegate:
+  virtual AsyncPixelTransferState*
+      CreateRawPixelTransferState(GLuint texture_id) OVERRIDE;
+
+  DISALLOW_COPY_AND_ASSIGN(AsyncPixelTransferDelegateStub);
+};
+
+}  // namespace gfx
+
+#endif  // UI_GL_ASYNC_TASK_DELEGATE_ANDROID_H_
+