[cc] Rename all cc/ filenames to Chromium style

cc/CCOcclusionTracker.h

Index: cc/CCOcclusionTracker.h
diff --git a/cc/CCOcclusionTracker.h b/cc/CCOcclusionTracker.h
index c2526cdc38eb04639c92ab76a344a2d4b60137e4..b7c8ce0fa1655b9d8d5790d2722bf975bde95987 100644
--- a/cc/CCOcclusionTracker.h
+++ b/cc/CCOcclusionTracker.h
@@ -2,104 +2,5 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef CCOcclusionTracker_h
-#define CCOcclusionTracker_h
-
-#include "base/basictypes.h"
-#include "CCLayerIterator.h"
-#include "FloatQuad.h"
-#include "Region.h"
-
-namespace cc {
-class CCOverdrawMetrics;
-class CCLayerImpl;
-class CCRenderSurface;
-class LayerChromium;
-class RenderSurfaceChromium;
-
-// This class is used to track occlusion of layers while traversing them in a front-to-back order. As each layer is visited, one of the
-// methods in this class is called to notify it about the current target surface.
-// Then, occlusion in the content space of the current layer may be queried, via methods such as occluded() and unoccludedContentRect().
-// If the current layer owns a RenderSurface, then occlusion on that RenderSurface may also be queried via surfaceOccluded() and surfaceUnoccludedContentRect().
-// Finally, once finished with the layer, occlusion behind the layer should be marked by calling markOccludedBehindLayer().
-template<typename LayerType, typename RenderSurfaceType>
-class CCOcclusionTrackerBase {
-public:
-    CCOcclusionTrackerBase(IntRect rootTargetRect, bool recordMetricsForFrame);
-
-    // Called at the beginning of each step in the CCLayerIterator's front-to-back traversal.
-    void enterLayer(const CCLayerIteratorPosition<LayerType>&);
-    // Called at the end of each step in the CCLayerIterator's front-to-back traversal.
-    void leaveLayer(const CCLayerIteratorPosition<LayerType>&);
-
-    // Returns true if the given rect in content space for the layer is fully occluded in either screen space or the layer's target surface.
-    bool occluded(const LayerType*, const IntRect& contentRect, bool* hasOcclusionFromOutsideTargetSurface = 0) const;
-    // Gives an unoccluded sub-rect of |contentRect| in the content space of the layer. Used when considering occlusion for a layer that paints/draws something.
-    IntRect unoccludedContentRect(const LayerType*, const IntRect& contentRect, bool* hasOcclusionFromOutsideTargetSurface = 0) const;
-
-    // Gives an unoccluded sub-rect of |contentRect| in the content space of the renderTarget owned by the layer.
-    // Used when considering occlusion for a contributing surface that is rendering into another target.
-    IntRect unoccludedContributingSurfaceContentRect(const LayerType*, bool forReplica, const IntRect& contentRect, bool* hasOcclusionFromOutsideTargetSurface = 0) const;
-
-    // Report operations for recording overdraw metrics.
-    CCOverdrawMetrics& overdrawMetrics() const { return *m_overdrawMetrics.get(); }
-
-    // Gives the region of the screen that is not occluded by something opaque.
-    Region computeVisibleRegionInScreen() const { return subtract(Region(m_rootTargetRect), m_stack.last().occlusionInScreen); }
-
-    void setMinimumTrackingSize(const IntSize& size) { m_minimumTrackingSize = size; }
-
-    // The following is used for visualization purposes.
-    void setOccludingScreenSpaceRectsContainer(Vector<IntRect>* rects) { m_occludingScreenSpaceRects = rects; }
-
-protected:
-    struct StackObject {
-        StackObject() : target(0) { }
-        StackObject(const LayerType* target) : target(target) { }
-        const LayerType* target;
-        Region occlusionInScreen;
-        Region occlusionInTarget;
-    };
-
-    // The stack holds occluded regions for subtrees in the RenderSurface-Layer tree, so that when we leave a subtree we may
-    // apply a mask to it, but not to the parts outside the subtree.
-    // - The first time we see a new subtree under a target, we add that target to the top of the stack. This can happen as a layer representing itself, or as a target surface.
-    // - When we visit a target surface, we apply its mask to its subtree, which is at the top of the stack.
-    // - When we visit a layer representing itself, we add its occlusion to the current subtree, which is at the top of the stack.
-    // - When we visit a layer representing a contributing surface, the current target will never be the top of the stack since we just came from the contributing surface.
-    // We merge the occlusion at the top of the stack with the new current subtree. This new target is pushed onto the stack if not already there.
-    Vector<StackObject, 1> m_stack;
-
-    // Allow tests to override this.
-    virtual IntRect layerClipRectInTarget(const LayerType*) const;
-
-private:
-    // Called when visiting a layer representing itself. If the target was not already current, then this indicates we have entered a new surface subtree.
-    void enterRenderTarget(const LayerType* newTarget);
-
-    // Called when visiting a layer representing a target surface. This indicates we have visited all the layers within the surface, and we may
-    // perform any surface-wide operations.
-    void finishedRenderTarget(const LayerType* finishedTarget);
-
-    // Called when visiting a layer representing a contributing surface. This indicates that we are leaving our current surface, and
-    // entering the new one. We then perform any operations required for merging results from the child subtree into its parent.
-    void leaveToRenderTarget(const LayerType* newTarget);
-
-    // Add the layer's occlusion to the tracked state.
-    void markOccludedBehindLayer(const LayerType*);
-
-    IntRect m_rootTargetRect;
-    OwnPtr<CCOverdrawMetrics> m_overdrawMetrics;
-    IntSize m_minimumTrackingSize;
-
-    // This is used for visualizing the occlusion tracking process.
-    Vector<IntRect>* m_occludingScreenSpaceRects;
-
-    DISALLOW_COPY_AND_ASSIGN(CCOcclusionTrackerBase);
-};
-
-typedef CCOcclusionTrackerBase<LayerChromium, RenderSurfaceChromium> CCOcclusionTracker;
-typedef CCOcclusionTrackerBase<CCLayerImpl, CCRenderSurface> CCOcclusionTrackerImpl;
-
-}
-#endif // CCOcclusionTracker_h
+// Temporary forwarding header
+#include "cc/occlusion_tracker.h"