cc: Remove impl_transform_is_unknown argument from OcclusionTracker.

cc/trees/occlusion_tracker.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_TREES_OCCLUSION_TRACKER_H_
 #define CC_TREES_OCCLUSION_TRACKER_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 31 matching lines @@
   // Called at the end of each step in the LayerIterator's front-to-back
   // traversal.
   void LeaveLayer(const LayerIteratorPosition<LayerType>& layer_iterator);
 
   // Returns true if the given rect in content space for a layer is fully
   // occluded in either screen space or the layer's target surface.
   // |render_target| is the contributing layer's render target, and
   // |draw_transform| and |impl_draw_transform_is_unknown| are relative to that.
   bool Occluded(const LayerType* render_target,
                 const gfx::Rect& content_rect,
-                const gfx::Transform& draw_transform,
-                bool impl_draw_transform_is_unknown) const;
+                const gfx::Transform& draw_transform) const;
 
   // Gives an unoccluded sub-rect of |content_rect| in the content space of a
   // layer. Used when considering occlusion for a layer that paints/draws
   // something. |render_target| is the contributing layer's render target, and
   // |draw_transform| and |impl_draw_transform_is_unknown| are relative to that.
-  gfx::Rect UnoccludedContentRect(
-      const LayerType* render_target,
-      const gfx::Rect& content_rect,
-      const gfx::Transform& draw_transform,
-      bool impl_draw_transform_is_unknown) const;
+  gfx::Rect UnoccludedContentRect(const LayerType* render_target,
+                                  const gfx::Rect& content_rect,
+                                  const gfx::Transform& draw_transform) const;
 
   // Gives an unoccluded sub-rect of |content_rect| in the content space of the
   // render_target owned by the layer. Used when considering occlusion for a
   // contributing surface that is rendering into another target.
   gfx::Rect UnoccludedContributingSurfaceContentRect(
       const LayerType* layer,
       bool for_replica,
       const gfx::Rect& content_rect) const;
 
   // Report operations for recording overdraw metrics.
@@ skipping 79 matching lines @@
 };
 
 #if !defined(COMPILER_MSVC)
 extern template class OcclusionTracker<Layer>;
 extern template class OcclusionTracker<LayerImpl>;
 #endif
 
 }  // namespace cc
 
 #endif  // CC_TREES_OCCLUSION_TRACKER_H_