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..e6883ccc3520a34bffd92de4bd9727beb63796a3 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 +27,12 @@ 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();
 
@@ -35,12 +44,19 @@ struct CC_EXPORT OverlayCandidate {
   gfx::Rect display_rect;
   // Crop within the buffer to be placed inside |display_rect|.
   gfx::RectF uv_rect;
+  // Texture resource to present in an overlay.
+  unsigned resource_id;
+  // Stacking order of the overlay plane relative to the main surface,
+  // which is 0. Signed to allow for "underlays".
+  int plane_z_order;
 
   // To be modified by the implementer if this candidate can go into
   // an overlay.
   bool overlay_handled;
 };
 
+typedef std::vector<OverlayCandidate> OverlayCandidateList;
+
 }  // namespace cc
 
 #endif  // CC_OUTPUT_OVERLAY_CANDIDATE_H_