[Ozone] Fix SingleOnTop issue by checking if the quad is clipped.

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 b3e7fb359f19e4b7e6a1d15ace9f5cc3046c97c9..20326f658b1902f4ea9f03c6eb432927646c01a9 100644
--- a/cc/output/overlay_candidate.h
+++ b/cc/output/overlay_candidate.h
@@ -41,12 +41,17 @@ class CC_EXPORT OverlayCandidate {
   gfx::RectF display_rect;
   // Crop within the buffer to be placed inside |display_rect|.
   gfx::RectF uv_rect;
+  // Quad geometry rect after applying the quad_transform().
+  gfx::Rect quad_rect_in_target_space;
+  // Clip rect in the target content space after composition.
+  gfx::Rect clip_rect;
+  // If the quad is clipped after composition.
+  bool is_clipped;

[danakj, 2015/09/01 20:35:24]

you need to initialize this in the constructor

[william.xie1, 2015/09/01 21:50:12]

Done.

   // 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;
-

[danakj, 2015/09/01 20:35:24]

leave this

[william.xie1, 2015/09/01 21:50:12]

Done.

   // To be modified by the implementer if this candidate can go into
   // an overlay.
   bool overlay_handled;