Add Hide to app menu.

apps/app_shim/app_shim_messages.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Multiply-included message file, hence no include guard.
 
 #include <string>
 
 #include "apps/app_shim/app_shim_launch.h"
 #include "base/files/file_path.h"
 #include "ipc/ipc_message_macros.h"
 #include "ipc/param_traits_macros.h"
 
 #define IPC_MESSAGE_START AppShimMsgStart
 
 IPC_ENUM_TRAITS_MAX_VALUE(apps::AppShimLaunchType,
                           apps::APP_SHIM_LAUNCH_NUM_TYPES - 1)
 IPC_ENUM_TRAITS_MAX_VALUE(apps::AppShimLaunchResult,
                           apps::APP_SHIM_LAUNCH_NUM_RESULTS - 1)
 IPC_ENUM_TRAITS_MAX_VALUE(apps::AppShimFocusType,
                           apps::APP_SHIM_FOCUS_NUM_TYPES - 1)
 
 // Signals that a previous LaunchApp message has been processed, and lets the
 // app shim process know whether it was registered successfully.
 IPC_MESSAGE_CONTROL1(AppShimMsg_LaunchApp_Done,
                      apps::AppShimLaunchResult /* launch result */)
 
+// Instructs the shim to hide the app.

[tapted, 2013/09/03 08:17:25]

nit: should we say something about the actual effect? e.g. "Effectively, doesn't
manipulate any windows, but marks the shim application as hidden in order to
display appropriate options in its Dock context menu."

[jackhou1, 2013/09/04 01:31:31]

Actually it does use the shim to hide. I don't think it's possible to mark the
shim as hidden without having it fire applicationWillHide. 

+IPC_MESSAGE_CONTROL0(AppShimMsg_Hide)
+
 // Instructs the shim to request user attention.
 IPC_MESSAGE_CONTROL0(AppShimMsg_RequestUserAttention)
 
 // Signals to the main Chrome process that a shim has started indicating the
 // profile and app_id that the shim should be associated with and whether to
 // launch the app immediately.
 IPC_MESSAGE_CONTROL3(AppShimHostMsg_LaunchApp,
                      base::FilePath /* profile dir */,
                      std::string /* app id */,
                      apps::AppShimLaunchType /* launch type */)
 
 // Sent when the user has indicated a desire to focus the app, either by
 // clicking on the app's icon in the dock or by selecting it with Cmd+Tab. In
 // response, Chrome brings the app's windows to the foreground, or relaunches
 // if the focus type indicates a reopen and there are no open windows.
 IPC_MESSAGE_CONTROL1(AppShimHostMsg_FocusApp,
                      apps::AppShimFocusType /* focus type */)
 
 // Sent when the app shim is hidden or unhidden.
 IPC_MESSAGE_CONTROL1(AppShimHostMsg_SetAppHidden,
                      bool /* hidden */)
 
 // Sent when the shim process receives a request to terminate. Once all of the
 // app's windows have closed, and the extension is unloaded, the AppShimHost
 // closes the channel. The shim process then completes the terminate request
 // and exits.
 IPC_MESSAGE_CONTROL0(AppShimHostMsg_QuitApp)