Avoid exposing gl bindings through cc public API headers

cc/scrollbar_layer.h

 // 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_SCROLLBAR_LAYER_H_
 #define CC_SCROLLBAR_LAYER_H_
 
-#include "cc/caching_bitmap_content_layer_updater.h"
 #include "cc/cc_export.h"
 #include "cc/contents_scaling_layer.h"
+#include "cc/layer_updater.h"
 #include "cc/scrollbar_theme_painter.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebScrollbar.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebScrollbarThemeGeometry.h"
 
 namespace cc {
-
+class CachingBitmapContentLayerUpdater;
 class ResourceUpdateQueue;
 class Scrollbar;
 class ScrollbarThemeComposite;
 
 class CC_EXPORT ScrollbarLayer : public ContentsScalingLayer {
 public:
     virtual scoped_ptr<LayerImpl> createLayerImpl(LayerTreeImpl* treeImpl) OVERRIDE;
 
     static scoped_refptr<ScrollbarLayer> create(
         scoped_ptr<WebKit::WebScrollbar>,
@@ skipping 33 matching lines @@
     bool isDirty() const { return !m_dirtyRect.IsEmpty(); }
 
     int maxTextureSize();
     float clampScaleToMaxTextureSize(float scale);
 
     scoped_ptr<WebKit::WebScrollbar> m_scrollbar;
     scoped_ptr<ScrollbarThemePainter> m_painter;
     scoped_ptr<WebKit::WebScrollbarThemeGeometry> m_geometry;
     int m_scrollLayerId;
 
-    GLenum m_textureFormat;
+    unsigned m_textureFormat;
 
     gfx::RectF m_dirtyRect;
 
     scoped_refptr<CachingBitmapContentLayerUpdater> m_backTrackUpdater;
     scoped_refptr<CachingBitmapContentLayerUpdater> m_foreTrackUpdater;
     scoped_refptr<CachingBitmapContentLayerUpdater> m_thumbUpdater;
 
     // All the parts of the scrollbar except the thumb
     scoped_ptr<LayerUpdater::Resource> m_backTrack;
     scoped_ptr<LayerUpdater::Resource> m_foreTrack;
     scoped_ptr<LayerUpdater::Resource> m_thumb;
 };
 
 }
 #endif  // CC_SCROLLBAR_LAYER_H_