Add a main menu to the shim that matches the one in Chrome.

apps/app_shim/chrome_main_app_mode_mac.mm

Index: apps/app_shim/chrome_main_app_mode_mac.mm
diff --git a/apps/app_shim/chrome_main_app_mode_mac.mm b/apps/app_shim/chrome_main_app_mode_mac.mm
index 2302b047b7e464779dc016a6d668ed2fa6e9de36..81394557a5df0ac90239e5578038ce7f95e6bb7d 100644
--- a/apps/app_shim/chrome_main_app_mode_mac.mm
+++ b/apps/app_shim/chrome_main_app_mode_mac.mm
@@ -64,6 +64,9 @@ class AppShimController : public IPC::Listener {
   // Connects to Chrome and sends a LaunchApp message.
   void Init();
 
+  // Builds main menu bar items.
+  void SetUpMenu();
+
   void SendSetAppHidden(bool hidden);
 
   void SendQuitApp();
@@ -97,6 +100,10 @@ AppShimController::AppShimController() : channel_(NULL),
 
 void AppShimController::Init() {
   DCHECK(g_io_thread);
+
+  SetUpMenu();
+
+  // Open an IPC channel to Chrome and send the initial app launch message.
   NSString* chrome_bundle_path =
       base::SysUTF8ToNSString(g_info->chrome_outer_bundle_path.value());
   NSBundle* chrome_bundle = [NSBundle bundleWithPath:chrome_bundle_path];
@@ -123,6 +130,38 @@ void AppShimController::Init() {
   [NSApp setDelegate:nsapp_delegate_];
 }
 
+void AppShimController::SetUpMenu() {
+  NSString* title = base::SysUTF16ToNSString(g_info->app_mode_name);
+
+  // Create a main menu since [NSApp mainMenu] is nil.
+  base::scoped_nsobject<NSMenu> main_menu([[NSMenu alloc] initWithTitle:title]);
+
+  // The title of the first item is replaced by OSX with the name of the app and
+  // bold styling. Create a dummy item for this and make it hidden.
+  NSMenuItem* dummy_item = [main_menu addItemWithTitle:title
+                                                action:nil
+                                         keyEquivalent:@""];
+  base::scoped_nsobject<NSMenu> dummy_submenu(
+      [[NSMenu alloc] initWithTitle:title]);
+  [dummy_item setSubmenu:dummy_submenu];

[tapted, 2013/07/22 02:35:09]

just checking - what happens if you delete this line? Does it cause OSX to
replace the second item in main_menu with a bolded app name insead?

[jackhou1, 2013/07/22 11:27:04]

The first item is still replaced, but it doesn't get hidden, even after
[dummy_item setHidden:YES].

+  [dummy_item setHidden:YES];
+
+  // Construct an unbolded app menu, to match how it appears in the Chrome menu
+  // bar when the app is focused.
+  NSMenuItem* item = [main_menu addItemWithTitle:title
+                                          action:nil
+                                   keyEquivalent:@""];
+  base::scoped_nsobject<NSMenu> submenu([[NSMenu alloc] initWithTitle:title]);
+  [item setSubmenu:submenu];
+
+  // Add a quit entry.
+  [submenu addItemWithTitle:[@"Quit " stringByAppendingString:title]
+                     action:@selector(terminate:)
+              keyEquivalent:@"q"];
+
+  [NSApp setMainMenu:main_menu];
+}
+
 void AppShimController::SendQuitApp() {
   channel_->Send(new AppShimHostMsg_QuitApp);
 }