cc: Rework overlays to not use the ResourceProvider and pass texture size

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 36396358e65941ef4c1b2a5b25c965000f8f60ab..b3e7fb359f19e4b7e6a1d15ace9f5cc3046c97c9 100644
--- a/cc/output/overlay_candidate.h
+++ b/cc/output/overlay_candidate.h
@@ -34,6 +34,8 @@ class CC_EXPORT OverlayCandidate {
   gfx::OverlayTransform transform;
   // Format of the buffer to composite.
   ResourceFormat format;
+  // Size of the resource, in pixels.
+  gfx::Size resource_size_in_pixels;
   // Rect on the display to position the overlay to. Implementer must convert
   // to integer coordinates if setting |overlay_handled| to true.
   gfx::RectF display_rect;