cc: Add UMA for tracking decode duration for out of raster decodes.

cc/tiles/checker_image_tracker.cc

Index: cc/tiles/checker_image_tracker.cc
diff --git a/cc/tiles/checker_image_tracker.cc b/cc/tiles/checker_image_tracker.cc
index 022269d87a95fa52d4661581e4c527c4799f32d4..3790c2912ade6eb81abf0394bd854903e63395ec 100644
--- a/cc/tiles/checker_image_tracker.cc
+++ b/cc/tiles/checker_image_tracker.cc
@@ -211,7 +211,8 @@ void CheckerImageTracker::ScheduleNextImageDecode() {
       image_controller_->QueueImageDecode(
           outstanding_image_decode_.value().sk_image(),
           base::Bind(&CheckerImageTracker::DidFinishImageDecode,
-                     weak_factory_.GetWeakPtr(), image_id));
+                     weak_factory_.GetWeakPtr(), image_id),
+          ImageDecodeCache::ImageDecodeType::OUT_OF_RASTER_CHECKER_IMAGING);
 
   image_id_to_decode_.emplace(image_id, base::MakeUnique<ScopedDecodeHolder>(
                                             image_controller_, request_id));