Fix CC*Renderer and CC*LayerImpl to compile with Clang

cc/CCScrollbarLayerImpl.cpp

 // 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.
 
 #include "config.h"
 
 #if USE(ACCELERATED_COMPOSITING)
 
 #include "CCScrollbarLayerImpl.h"
 
@@ skipping 23 matching lines @@
     , m_pressedPart(WebScrollbar::NoPart)
     , m_hoveredPart(WebScrollbar::NoPart)
     , m_isScrollableAreaActive(false)
     , m_isScrollViewScrollbar(false)
     , m_enabled(false)
     , m_isCustomScrollbar(false)
     , m_isOverlayScrollbar(false)
 {
 }
 
+CCScrollbarLayerImpl::~CCScrollbarLayerImpl()
+{
+}
+
 void CCScrollbarLayerImpl::setScrollbarGeometry(PassOwnPtr<CCScrollbarGeometryFixedThumb> geometry)
 {
     m_geometry = geometry;
 }
 
 void CCScrollbarLayerImpl::setScrollbarData(WebScrollbar* scrollbar)
 {
     m_scrollbarOverlayStyle = scrollbar->scrollbarOverlayStyle();
     m_orientation = scrollbar->orientation();
     m_controlSize = scrollbar->controlSize();
@@ skipping 130 matching lines @@
 WebScrollbar::Orientation CCScrollbarLayerImpl::CCScrollbar::orientation() const
 {
     return m_owner->m_orientation;
 }
 
 bool CCScrollbarLayerImpl::CCScrollbar::isCustomScrollbar() const
 {
     return m_owner->m_isCustomScrollbar;
 }
 
+const char* CCScrollbarLayerImpl::layerTypeAsString() const
+{
+    return "ScrollbarLayer";
 }
+
+}
+
 #endif // USE(ACCELERATED_COMPOSITING)