Add support for non-integer scaling factors in resource_scale_factors presubmit script

ui/resources/PRESUBMIT.py

Index: ui/resources/PRESUBMIT.py
diff --git a/ui/resources/PRESUBMIT.py b/ui/resources/PRESUBMIT.py
index ba38b7106a77cd562712e0035d42af9bf138083d..6155479df1c66706b3b2d7d2bd3c16b73ab33510 100644
--- a/ui/resources/PRESUBMIT.py
+++ b/ui/resources/PRESUBMIT.py
@@ -27,8 +27,8 @@ def _CommonChecks(input_api, output_api):
   # List of paths with their associated scale factor. This is used to verify
   # that the images modified in one are the correct scale of the other.
   path_scales = [
-    [(1, 'default_100_percent/'), (2, 'default_200_percent/')],
-    [(1, 'touch_100_percent/'), (2, 'touch_200_percent/')],
+    [(100, 'default_100_percent/'), (200, 'default_200_percent/')],
+    [(100, 'touch_100_percent/'), (200, 'touch_200_percent/')],
   ]
 
   import sys