Implement the texture uploading of ASTC compression for WebGL(part II)

Source/modules/webgl/WebGLCompressedTextureASTC.h

+// Copyright 2015 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 WebGLCompressedTextureASTC_h
+#define WebGLCompressedTextureASTC_h
+
+#include "modules/webgl/WebGLExtension.h"
+
+namespace blink {
+
+class WebGLCompressedTextureASTC final : public WebGLExtension {
+    DEFINE_WRAPPERTYPEINFO();
+public:
+    typedef struct {
+        int CompressType;
+        int blockWidth;
+        int blockHeight;
+    } BlockSizeCompressASTC;
+
+    static WebGLCompressedTextureASTC* create(WebGLRenderingContextBase*);
+    static bool supported(WebGLRenderingContextBase*);
+    static const char* extensionName();
+
+    ~WebGLCompressedTextureASTC() override;
+    WebGLExtensionName name() const override;
+    static const BlockSizeCompressASTC kBlockSizeCompressASTC[];
+
+private:
+    explicit WebGLCompressedTextureASTC(WebGLRenderingContextBase*);
+};
+
+} // namespace blink
+
+#endif // WebGLCompressedTextureASTC_h