[FilesApp] Make the Files app window frame white in files-ng

Make the Files app window frame white in files-ng. The frame color of
Video Player, Gallery, and Audio Player are not changed.

Minor: Fix var/let/const pre-submit nits. Add eslint var exception to
the var loader = {} ... line, since per the patchset #1 try jobs, the

  KeyboardOperations/FilesAppBrowserTest*/keyboardOpenNewWindow*

tests fail if const (or let) is used instead of var.

Bug: 1057918
Change-Id: Ic7beb58e34b9d152bff90de1c775d7dd16442a47
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2084335Reviewed-by: Alex Danilo <adanilo@chromium.org>
Reviewed-by: Noel Gordon <noel@chromium.org>
Commit-Queue: Noel Gordon <noel@chromium.org>
Auto-Submit: Noel Gordon <noel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#746600}

ui/file_manager/file_manager/background/js/launcher.js

@@ -5,6 +5,7 @@
 /**
  * @type {!Object}
  */
+// eslint-disable-next-line no-var
 var launcher = {};
 
 /**
@@ -82,7 +83,7 @@ launcher.launchFileManager = (opt_appState, opt_id, opt_type, opt_callback) => {
     if (type == LaunchType.FOCUS_SAME_OR_CREATE ||
         type == LaunchType.FOCUS_ANY_OR_CREATE) {
       if (opt_appState) {
-        for (var key in window.appWindows) {
+        for (const key in window.appWindows) {
           if (!key.match(FILES_ID_PATTERN)) {
             continue;
           }
@@ -114,7 +115,7 @@ launcher.launchFileManager = (opt_appState, opt_id, opt_type, opt_callback) => {
     // Focus any window if none is focused. Try restored first.
     if (type == LaunchType.FOCUS_ANY_OR_CREATE) {
       // If there is already a focused window, then finish.
-      for (var key in window.appWindows) {
+      for (const key in window.appWindows) {
         if (!key.match(FILES_ID_PATTERN)) {
           continue;
         }
@@ -134,7 +135,7 @@ launcher.launchFileManager = (opt_appState, opt_id, opt_type, opt_callback) => {
         }
       }
       // Try to focus the first non-minimized window.
-      for (var key in window.appWindows) {
+      for (const key in window.appWindows) {
         if (!key.match(FILES_ID_PATTERN)) {
           continue;
         }
@@ -149,7 +150,7 @@ launcher.launchFileManager = (opt_appState, opt_id, opt_type, opt_callback) => {
         }
       }
       // Restore and focus any window.
-      for (var key in window.appWindows) {
+      for (const key in window.appWindows) {
         if (!key.match(FILES_ID_PATTERN)) {
           continue;
         }
@@ -170,6 +171,11 @@ launcher.launchFileManager = (opt_appState, opt_id, opt_type, opt_callback) => {
     nextFileManagerWindowID = Math.max(nextFileManagerWindowID, id + 1);
     const appId = FILES_ID_PREFIX + id;
 
+    // Make the files-ng frame color white.
+    if (util.isFilesNg()) {
+      FILE_MANAGER_WINDOW_CREATE_OPTIONS.frame.color = '#ffffff';
+    }
+
     const appWindow = new AppWindowWrapper(
         'main.html', appId, FILE_MANAGER_WINDOW_CREATE_OPTIONS);
     appWindow.launch(opt_appState || {}, false, () => {