cc: Add frame data to LTHI tracing

cc/quads/shared_quad_state.h

Index: cc/quads/shared_quad_state.h
diff --git a/cc/quads/shared_quad_state.h b/cc/quads/shared_quad_state.h
index eb3e91eaedb905235e77efd599d7c065791aadea..130b6994ad411981742e44af5fb4d18458a81c25 100644
--- a/cc/quads/shared_quad_state.h
+++ b/cc/quads/shared_quad_state.h
@@ -28,9 +28,11 @@ class CC_EXPORT SharedQuadState {
 
   // Transforms from quad's original content space to its target content space.
   gfx::Transform content_to_target_transform;
-  // This rect lives in the content space for the quad's originating layer.
+  // This size lives in the content space for the quad's originating layer.
   gfx::Size content_bounds;
+  // This rect lives in the content space for the quad's originating layer.
   gfx::Rect visible_content_rect;
+  // This rect lives in the target content space.
   gfx::Rect clip_rect;
   bool is_clipped;
   float opacity;