Set debug color for borders of compressed tiles.

cc/tiles/tile_draw_info.h

Index: cc/tiles/tile_draw_info.h
diff --git a/cc/tiles/tile_draw_info.h b/cc/tiles/tile_draw_info.h
index 05596ba921637cac6ddf0391dfc98944a0426a6d..6d694ebf1e2e41c4ca238ecbb0463d3a2e510402 100644
--- a/cc/tiles/tile_draw_info.h
+++ b/cc/tiles/tile_draw_info.h
@@ -73,6 +73,10 @@ class CC_EXPORT TileDrawInfo {
 
   inline bool has_resource() const { return !!resource_; }
 
+  inline bool has_compressed_resource() const {
+    return resource_ ? IsResourceFormatCompressed(resource_->format()) : false;
+  }
+
   void SetSolidColorForTesting(SkColor color) { set_solid_color(color); }
 
   void AsValueInto(base::trace_event::TracedValue* state) const;