[cc] Rename all cc/ filenames to Chromium style

cc/stubs/extensions_3d.h

-// Copyright 2012 The Chromium Authors. All rights reserved.
+// 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 CC_STUBS_EXTENSIONS3D_H_
+#define CC_STUBS_EXTENSIONS3D_H_
+
+#include "third_party/khronos/GLES2/gl2.h"
+#include "third_party/khronos/GLES2/gl2ext.h"
+
+namespace cc {
+
+class Extensions3D {
+public:
+    enum {
+        TEXTURE_RECTANGLE_ARB = GL_TEXTURE_RECTANGLE_ARB,
+        BGRA_EXT = GL_BGRA_EXT,
+        RGBA8_OES = GL_RGBA8_OES,
+    };
+};
+
+}
+
+
+#endif  // CC_STUBS_EXTENSIONS3D_H_