cc: Create a cc::ScrollbarThemePainter and an adapter class in compositor bindings.

cc/test/fake_web_scrollbar.h

Index: cc/test/fake_web_scrollbar.h
diff --git a/cc/test/fake_web_scrollbar.h b/cc/test/fake_web_scrollbar.h
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+// Copyright 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_TEST_FAKE_WEB_SCROLLBAR_H_
+#define CC_TEST_FAKE_WEB_SCROLLBAR_H_
+
+#include "base/memory/scoped_ptr.h"
+#include <public/WebScrollbar.h>
+
+namespace cc {
+
+class FakeWebScrollbar : public WebKit::WebScrollbar {
+ public:
+  static scoped_ptr<FakeWebScrollbar> create() {
+    return make_scoped_ptr(new FakeWebScrollbar());
+  }
+
+  // WebScrollbar implementation
+  virtual bool isOverlay() const OVERRIDE;
+  virtual int value() const OVERRIDE;
+  virtual WebKit::WebPoint location() const OVERRIDE;
+  virtual WebKit::WebSize size() const OVERRIDE;
+  virtual bool enabled() const OVERRIDE;
+  virtual int maximum() const OVERRIDE;
+  virtual int totalSize() const OVERRIDE;
+  virtual bool isScrollViewScrollbar() const OVERRIDE;
+  virtual bool isScrollableAreaActive() const OVERRIDE;
+  virtual void getTickmarks(WebKit::WebVector<WebKit::WebRect>&) const OVERRIDE {}
+  virtual ScrollbarControlSize controlSize() const OVERRIDE;
+  virtual ScrollbarPart pressedPart() const OVERRIDE;
+  virtual ScrollbarPart hoveredPart() const OVERRIDE;
+  virtual ScrollbarOverlayStyle scrollbarOverlayStyle() const OVERRIDE;
+  virtual bool isCustomScrollbar() const OVERRIDE;
+  virtual Orientation orientation() const OVERRIDE;
+};
+
+}  // namespace cc
+
+#endif  // CC_TEST_FAKE_WEB_SCROLLBAR_H_