Files.app: Extract the TextMeasure class to a new file.

chrome/browser/resources/file_manager/main.html

Index: chrome/browser/resources/file_manager/main.html
diff --git a/chrome/browser/resources/file_manager/main.html b/chrome/browser/resources/file_manager/main.html
index 052f53df9782860b3deafa516be1b20138ce3032..1f57a65e9c6ad89f004f39415f054d6ce771cd82 100644
--- a/chrome/browser/resources/file_manager/main.html
+++ b/chrome/browser/resources/file_manager/main.html
@@ -112,6 +112,7 @@
       <script src="js/share_client.js"></script>
       <script src="js/share_dialog.js"></script>
       <script src="js/suggest_apps_dialog.js"></script>
+      <script src="js/text_measure.js"></script>
       <script src="js/tree.css.js"></script>
       <script src="js/volume_manager.js"></script>
       <script src="js/media/media_util.js"></script>