Make OSX App Launcher Launchable from the Dock.

chrome/app/chrome_main_app_mode_mac.mm

Index: chrome/app/chrome_main_app_mode_mac.mm
diff --git a/chrome/app/chrome_main_app_mode_mac.mm b/chrome/app/chrome_main_app_mode_mac.mm
index ee7793cafa6e22c63b4e9cc77ce07bc703675161..e7b02ba7fcb3350c9434773157d7d9c4d9c2a22d 100644
--- a/chrome/app/chrome_main_app_mode_mac.mm
+++ b/chrome/app/chrome_main_app_mode_mac.mm
@@ -54,6 +54,9 @@ class AppShimController : public IPC::Listener {
   // shim process should die.
   void OnLaunchAppDone(bool success);
 
+  // Called when the Chrome process observes the app list dismissal.
+  void OnAppListDismissed();
+
   // Called when the app is activated, either by the user clicking on it in the
   // dock or by Cmd+Tabbing to it.
   void OnDidActivateApplication();
@@ -87,6 +90,12 @@ void AppShimController::Init() {
   channel_ = new IPC::ChannelProxy(handle, IPC::Channel::MODE_NAMED_CLIENT,
       this, g_io_thread->message_loop_proxy());
 
+  // Check if this ia a shim for showing the app list.
+  if (g_info->app_mode_id == app_mode::kAppListModeId) {
+    channel_->Send(new AppShimHostMsg_LaunchAppList());
+    return;
+  }
+
   channel_->Send(new AppShimHostMsg_LaunchApp(
       g_info->profile_dir.value(), g_info->app_mode_id));
 }
@@ -95,6 +104,7 @@ bool AppShimController::OnMessageReceived(const IPC::Message& message) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(AppShimController, message)
     IPC_MESSAGE_HANDLER(AppShimMsg_LaunchApp_Done, OnLaunchAppDone)
+    IPC_MESSAGE_HANDLER(AppShimMsg_AppListDismissed, OnAppListDismissed)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
 
@@ -123,6 +133,10 @@ void AppShimController::OnLaunchAppDone(bool success) {
   }];
 }
 
+void AppShimController::OnAppListDismissed() {
+  Quit();
+}
+
 void AppShimController::Quit() {
   [NSApp terminate:nil];
 }