Add keyboard shortcuts in Files.app to open inspector.

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 6040974762f9181b74f2edbbc1c1597eaf022ecc..6b6bea9b342f3096de53adecabe998bd8103a1ca 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
@@ -905,3 +905,48 @@ CommandHandler.COMMANDS_['zoom-reset'] = {
   },
   canExecute: CommandUtil.canExecuteAlways
 };
+
+/**
+ * Open inspector for foreground page.
+ * @type {Command}
+ */
+CommandHandler.COMMANDS_['inspect-normal'] = {
+  execute: function(event, fileManager) {
+    chrome.fileBrowserPrivate.openInspector('normal');
+  },
+  canExecute: CommandUtil.canExecuteAlways
+};
+
+/**
+ * Open inspector for foreground page and focus to console tab.
+ * @type {Command}
+ */
+CommandHandler.COMMANDS_['inspect-console'] = {
+  execute: function(event, fileManager) {
+    chrome.fileBrowserPrivate.openInspector('console');
+  },
+  canExecute: CommandUtil.canExecuteAlways
+};
+
+/**
+ * Open inspector for foreground page and start element inspection.
+ * @type {Command}
+ */
+CommandHandler.COMMANDS_['inspect-element'] = {
+  execute: function(event, fileManager) {
+    chrome.fileBrowserPrivate.openInspector('element');
+  },
+  canExecute: CommandUtil.canExecuteAlways
+};
+
+/**
+ * Open inspector for background page.
+ * @type {Command}
+ */
+CommandHandler.COMMANDS_['inspect-background'] = {
+  execute: function(event, fileManager) {
+    chrome.fileBrowserPrivate.openInspector('background');
+  },
+  canExecute: CommandUtil.canExecuteAlways
+};
+