cc: Move UnoccludedContentRect to Occlusion.

cc/trees/occlusion.h

Index: cc/trees/occlusion.h
diff --git a/cc/trees/occlusion.h b/cc/trees/occlusion.h
index 982d7e81c59bc6f1d754df6d10d5c2f130263978..60493cc2f7d5ff737469cd84adfa8a8daf5a3a4f 100644
--- a/cc/trees/occlusion.h
+++ b/cc/trees/occlusion.h
@@ -8,12 +8,9 @@
 #include "base/basictypes.h"
 #include "cc/base/cc_export.h"
 #include "cc/base/simple_enclosed_region.h"
+#include "ui/gfx/rect.h"
 #include "ui/gfx/transform.h"
 
-namespace gfx {
-class Rect;
-}  // namespace gfx
-
 namespace cc {
 
 class CC_EXPORT Occlusion {
@@ -24,8 +21,12 @@ class CC_EXPORT Occlusion {
             const SimpleEnclosedRegion& occlusion_from_inside_target);
 
   bool IsOccluded(const gfx::Rect& content_rect) const;
+  gfx::Rect GetUnoccludedContentRect(const gfx::Rect& content_rect) const;
 
  private:
+  gfx::Rect GetUnoccludedRectInTargetSurface(
+      const gfx::Rect& content_rect) const;
+
   gfx::Transform draw_transform_;
   SimpleEnclosedRegion occlusion_from_outside_target_;
   SimpleEnclosedRegion occlusion_from_inside_target_;