Avoid exposing gl bindings through cc public API headers

cc/content_layer.cc

 // Copyright 2010 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 "cc/content_layer.h"
 
 #include "base/auto_reset.h"
 #include "base/debug/trace_event.h"
 #include "base/metrics/histogram.h"
 #include "base/time.h"
@@ skipping 86 matching lines @@
         return;
     scoped_ptr<LayerPainter> painter = ContentLayerPainter::create(m_client).PassAs<LayerPainter>();
     if (layerTreeHost()->settings().acceleratePainting)
         m_updater = SkPictureContentLayerUpdater::create(painter.Pass());
     else if (layerTreeHost()->settings().perTilePaintingEnabled)
         m_updater = BitmapSkPictureContentLayerUpdater::create(painter.Pass());
     else
         m_updater = BitmapContentLayerUpdater::create(painter.Pass());
     m_updater->setOpaque(contentsOpaque());
 
-    GLenum textureFormat = layerTreeHost()->rendererCapabilities().bestTextureFormat;
+    unsigned textureFormat = layerTreeHost()->rendererCapabilities().bestTextureFormat;
     setTextureFormat(textureFormat);
 }
 
 void ContentLayer::setContentsOpaque(bool opaque)
 {
     Layer::setContentsOpaque(opaque);
     if (m_updater)
         m_updater->setOpaque(opaque);
 }
 
@@ skipping 25 matching lines @@
         // it does not really cause any invalidation.
         TRACE_EVENT_INSTANT0("cc", "ContentLayer::canUseLCDTextDidChange");
     }
     ++m_lcdTextChangeCount;
  
     // Need to repaint the layer with different text AA setting.
     setNeedsDisplay();
 }
 
 }  // namespace cc