(WIP) Use generator to generate externs for chrome.fileManagerPrivate API.

ui/file_manager/file_manager/foreground/js/file_manager_commands.js

Index: ui/file_manager/file_manager/foreground/js/file_manager_commands.js
diff --git a/ui/file_manager/file_manager/foreground/js/file_manager_commands.js b/ui/file_manager/file_manager/foreground/js/file_manager_commands.js
index 4a75d36768c361f455307bc448726f1196e9a6e6..a2228be5826d6fe358af4ff573a86ebccbe00ac5 100644
--- a/ui/file_manager/file_manager/foreground/js/file_manager_commands.js
+++ b/ui/file_manager/file_manager/foreground/js/file_manager_commands.js
@@ -1326,7 +1326,8 @@ CommandHandler.COMMANDS_['zoom-in'] = /** @type {Command} */ ({
    * @param {!FileManager} fileManager FileManager to use.
    */
   execute: function(event, fileManager) {
-    chrome.fileManagerPrivate.zoom('in');
+    chrome.fileManagerPrivate.zoom(
+        chrome.fileManagerPrivate.ZoomOperationType.IN);
   },
   canExecute: CommandUtil.canExecuteAlways
 });
@@ -1341,7 +1342,8 @@ CommandHandler.COMMANDS_['zoom-out'] = /** @type {Command} */ ({
    * @param {!FileManager} fileManager FileManager to use.
    */
   execute: function(event, fileManager) {
-    chrome.fileManagerPrivate.zoom('out');
+    chrome.fileManagerPrivate.zoom(
+        chrome.fileManagerPrivate.ZoomOperationType.OUT);
   },
   canExecute: CommandUtil.canExecuteAlways
 });
@@ -1356,7 +1358,8 @@ CommandHandler.COMMANDS_['zoom-reset'] = /** @type {Command} */ ({
    * @param {!FileManager} fileManager FileManager to use.
    */
   execute: function(event, fileManager) {
-    chrome.fileManagerPrivate.zoom('reset');
+    chrome.fileManagerPrivate.zoom(
+        chrome.fileManagerPrivate.ZoomOperationType.RESET);
   },
   canExecute: CommandUtil.canExecuteAlways
 });
@@ -1419,7 +1422,8 @@ CommandHandler.COMMANDS_['inspect-normal'] = /** @type {Command} */ ({
    * @param {!FileManager} fileManager FileManager to use.
    */
   execute: function(event, fileManager) {
-    chrome.fileManagerPrivate.openInspector('normal');
+    chrome.fileManagerPrivate.openInspector(
+        chrome.fileManagerPrivate.InspectionType.NORMAL);
   },
   canExecute: CommandUtil.canExecuteAlways
 });
@@ -1434,7 +1438,8 @@ CommandHandler.COMMANDS_['inspect-console'] = /** @type {Command} */ ({
    * @param {!FileManager} fileManager FileManager to use.
    */
   execute: function(event, fileManager) {
-    chrome.fileManagerPrivate.openInspector('console');
+    chrome.fileManagerPrivate.openInspector(
+        chrome.fileManagerPrivate.InspectionType.CONSOLE);
   },
   canExecute: CommandUtil.canExecuteAlways
 });
@@ -1449,7 +1454,8 @@ CommandHandler.COMMANDS_['inspect-element'] = /** @type {Command} */ ({
    * @param {!FileManager} fileManager FileManager to use.
    */
   execute: function(event, fileManager) {
-    chrome.fileManagerPrivate.openInspector('element');
+    chrome.fileManagerPrivate.openInspector(
+        chrome.fileManagerPrivate.InspectionType.ELEMENT);
   },
   canExecute: CommandUtil.canExecuteAlways
 });
@@ -1464,7 +1470,8 @@ CommandHandler.COMMANDS_['inspect-background'] = /** @type {Command} */ ({
    * @param {!FileManager} fileManager FileManager to use.
    */
   execute: function(event, fileManager) {
-    chrome.fileManagerPrivate.openInspector('background');
+    chrome.fileManagerPrivate.openInspector(
+        chrome.fileManagerPrivate.InspectionType.BACKGROUND);
   },
   canExecute: CommandUtil.canExecuteAlways
 });