Plumb overlay processing into DirectRenderer.

cc/output/overlay_candidate.h

Index: cc/output/overlay_candidate.h
diff --git a/cc/output/overlay_candidate.h b/cc/output/overlay_candidate.h
index c53013630d66aacb0462799b84c0c1eee324b256..356d5616e96ff91808652bfb3d11f4b081c21b11 100644
--- a/cc/output/overlay_candidate.h
+++ b/cc/output/overlay_candidate.h
@@ -11,11 +11,14 @@
 #include "cc/base/cc_export.h"
 #include "cc/resources/resource_format.h"
 #include "ui/gfx/geometry/rect.h"
+#include "ui/gfx/transform.h"
 
 namespace cc {
 
-struct CC_EXPORT OverlayCandidate {
+class CC_EXPORT OverlayCandidate {
+ public:
   enum OverlayTransform {
+    INVALID,
     NONE,
     FLIP_HORIZONTAL,
     FLIP_VERTICAL,
@@ -24,6 +27,11 @@ struct CC_EXPORT OverlayCandidate {
     ROTATE_270,
   };
 
+  static OverlayTransform GetOverlayTransform(
+      const gfx::Transform& quad_transform, bool flipped);
+  static gfx::Rect GetOverlayRect(const gfx::Transform& quad_transform,
+                                  const gfx::Rect& rect);
+
   OverlayCandidate();
   ~OverlayCandidate();