Add Hide to app menu.

chrome/browser/ui/cocoa/apps/app_shim_menu_controller_mac.mm

Index: chrome/browser/ui/cocoa/apps/app_shim_menu_controller_mac.mm
diff --git a/chrome/browser/ui/cocoa/apps/app_shim_menu_controller_mac.mm b/chrome/browser/ui/cocoa/apps/app_shim_menu_controller_mac.mm
index bcc272e0029b835baffa84ae0a3c02a9dd97575e..a6ff431dfe299f325cf47c7690862a1403b9ad2a 100644
--- a/chrome/browser/ui/cocoa/apps/app_shim_menu_controller_mac.mm
+++ b/chrome/browser/ui/cocoa/apps/app_shim_menu_controller_mac.mm
@@ -67,6 +67,8 @@ void AddDuplicateItem(NSMenuItem* top_level_item,
 - (void)removeMenuItems:(NSString*)appId;
 // If the currently focused window belongs to a platform app, quit the app.
 - (void)quitCurrentPlatformApp;
+// If the currently focused window belongs to a platform app, hide the app.
+- (void)hideCurrentPlatformApp;
 @end
 
 @implementation AppShimMenuController
@@ -85,7 +87,9 @@ void AddDuplicateItem(NSMenuItem* top_level_item,
 }
 
 - (void)buildAppMenuItems {
-  // Find the "Quit Chrome" menu item.
+  chromeMenuHideItem_.reset(
+      [GetItemByTag(IDC_CHROME_MENU, IDC_HIDE_APP) retain]);
+  DCHECK(chromeMenuHideItem_);
   chromeMenuQuitItem_.reset([GetItemByTag(IDC_CHROME_MENU, IDC_EXIT) retain]);
   DCHECK(chromeMenuQuitItem_);
 
@@ -94,15 +98,24 @@ void AddDuplicateItem(NSMenuItem* top_level_item,
                                                 action:nil
                                          keyEquivalent:@""]);
   base::scoped_nsobject<NSMenu> appMenu([[NSMenu alloc] initWithTitle:@""]);
+  [appMenuItem_ setSubmenu:appMenu];
   [appMenu setAutoenablesItems:NO];
+
+  NSMenuItem* appMenuHideItem =
+      [appMenu addItemWithTitle:@""
+                         action:@selector(hideCurrentPlatformApp)
+                  keyEquivalent:@"h"];
+  [appMenuHideItem setTarget:self];
+  [appMenuHideItem setTag:IDC_HIDE_APP];
+
+  [appMenu addItem:[NSMenuItem separatorItem]];
+
   NSMenuItem* appMenuQuitItem =
       [appMenu addItemWithTitle:@""
                          action:@selector(quitCurrentPlatformApp)
                   keyEquivalent:@"q"];
-  [appMenuQuitItem setKeyEquivalentModifierMask:
-      [chromeMenuQuitItem_ keyEquivalentModifierMask]];
   [appMenuQuitItem setTarget:self];
-  [appMenuItem_ setSubmenu:appMenu];
+  [appMenuQuitItem setTag:IDC_EXIT];
 
   // File menu.
   fileMenuItem_.reset([NewTopLevelItemFrom(IDC_FILE_MENU) retain]);
@@ -185,16 +198,20 @@ void AddDuplicateItem(NSMenuItem* top_level_item,
   for (NSMenuItem* item in [mainMenu itemArray])
     [item setHidden:YES];
 
+  NSString* localizedHideApp =
+      l10n_util::GetNSStringF(IDS_HIDE_APP_MAC, base::UTF8ToUTF16(app->name()));
+  [[[appMenuItem_ submenu] itemWithTag:IDC_HIDE_APP] setTitle:localizedHideApp];
+
   NSString* localizedQuitApp =
       l10n_util::GetNSStringF(IDS_EXIT_MAC, base::UTF8ToUTF16(app->name()));
-  NSMenuItem* appMenuQuitItem = [[[appMenuItem_ submenu] itemArray] lastObject];
-  [appMenuQuitItem setTitle:localizedQuitApp];
+  [[[appMenuItem_ submenu] itemWithTag:IDC_EXIT] setTitle:localizedQuitApp];
 
   // It seems that two menu items that have the same key equivalent must also
   // have the same action for the keyboard shortcut to work. (This refers to the
   // original keyboard shortcut, regardless of any overrides set in OSX).
-  // In order to let the appMenuQuitItem have a different action, we remove the
+  // In order to let the app menu items have a different action, we remove the
   // key equivalent from the chromeMenuQuitItem and restore it later.
+  [chromeMenuHideItem_ setKeyEquivalent:@""];
   [chromeMenuQuitItem_ setKeyEquivalent:@""];
 
   [appMenuItem_ setTitle:appId];
@@ -225,6 +242,7 @@ void AddDuplicateItem(NSMenuItem* top_level_item,
   // Restore the keyboard shortcut to Chrome. This just needs to be set back to
   // the original keyboard shortcut, regardless of any overrides in OSX. The
   // overrides still work as they are based on the title of the menu item.
+  [chromeMenuHideItem_ setKeyEquivalent:@"h"];
   [chromeMenuQuitItem_ setKeyEquivalent:@"q"];
 }
 
@@ -236,4 +254,12 @@ void AddDuplicateItem(NSMenuItem* top_level_item,
     apps::ExtensionAppShimHandler::QuitAppForWindow(shellWindow);
 }
 
+- (void)hideCurrentPlatformApp {
+  apps::ShellWindow* shellWindow =
+      apps::ShellWindowRegistry::GetShellWindowForNativeWindowAnyProfile(
+          [NSApp keyWindow]);
+  if (shellWindow)
+    apps::ExtensionAppShimHandler::HideAppForWindow(shellWindow);
+}
+
 @end