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

cc/tiles/decoded_image_tracker.cc

Index: cc/tiles/decoded_image_tracker.cc
diff --git a/cc/tiles/decoded_image_tracker.cc b/cc/tiles/decoded_image_tracker.cc
index 5672854c1f554ff578075859a2662d293799075a..6ce44544e3bd3e81018e30ebb7e7a3f0a8de6808 100644
--- a/cc/tiles/decoded_image_tracker.cc
+++ b/cc/tiles/decoded_image_tracker.cc
@@ -22,8 +22,10 @@ void DecodedImageTracker::QueueImageDecode(
   // Queue the decode in the image controller, but switch out the callback for
   // our own.
   image_controller_->QueueImageDecode(
-      std::move(image), base::Bind(&DecodedImageTracker::ImageDecodeFinished,
-                                   base::Unretained(this), callback));
+      std::move(image),
+      base::Bind(&DecodedImageTracker::ImageDecodeFinished,
+                 base::Unretained(this), callback),
+      ImageDecodeCache::ImageDecodeType::kJSDecode);
 }
 
 void DecodedImageTracker::NotifyFrameFinished() {