Move getBufferSubDataAsync to an extension

third_party/WebKit/Source/modules/webgl/WebGLGetBufferSubDataAsync.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 WebGLGetBufferSubDataAsync_h
+#define WebGLGetBufferSubDataAsync_h
+
+#include "bindings/core/v8/ScriptPromise.h"
+#include "modules/webgl/WebGLExtension.h"
+
+namespace blink {
+
+class WebGL2RenderingContextBase;
+
+class WebGLGetBufferSubDataAsync final : public WebGLExtension {
+  DEFINE_WRAPPERTYPEINFO();
+
+ public:
+  static WebGLGetBufferSubDataAsync* create(WebGLRenderingContextBase*);
+  static bool supported(WebGLRenderingContextBase*);
+  static const char* extensionName();
+
+  WebGLExtensionName name() const override;
+
+  ScriptPromise getBufferSubDataAsync(ScriptState*,
+                                      GLenum target,
+                                      GLintptr srcByteOffset,
+                                      DOMArrayBufferView*,
+                                      GLuint dstOffset,
+                                      GLuint length);
+
+ private:
+  explicit WebGLGetBufferSubDataAsync(WebGLRenderingContextBase*);
+};
+
+class WebGLGetBufferSubDataAsyncCallback
+    : public GarbageCollected<WebGLGetBufferSubDataAsyncCallback> {
+ public:
+  WebGLGetBufferSubDataAsyncCallback(WebGL2RenderingContextBase*,
+                                     ScriptPromiseResolver*,
+                                     void* shmReadbackResultData,
+                                     GLuint commandsIssuedQueryID,
+                                     DOMArrayBufferView*,
+                                     void* destinationDataPtr,
+                                     long long destinationByteLength);
+
+  void destroy();
+
+  void resolve();
+
+  DECLARE_TRACE();
+
+ private:
+  WeakMember<WebGL2RenderingContextBase> m_context;
+  Member<ScriptPromiseResolver> m_promiseResolver;
+
+  // Pointer to shared memory where the gpu readback result is stored.
+  void* m_shmReadbackResultData;
+  // ID of the GL query used to call this callback.
+  GLuint m_commandsIssuedQueryID;
+
+  // ArrayBufferView returned from the promise.
+  Member<DOMArrayBufferView> m_destinationArrayBufferView;
+  // Pointer into the offset into destinationArrayBufferView.
+  void* m_destinationDataPtr;
+  // Size in bytes of the copy operation being performed.
+  long long m_destinationByteLength;
+};
+
+}  // namespace blink
+
+#endif  // WebGLGetBufferSubDataAsync_h