Send Chrome's process id to the app shim.

chrome/browser/web_applications/web_app_mac.mm

 // Copyright (c) 2012 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.
 
 #import "chrome/browser/web_applications/web_app_mac.h"
 
 #import <Carbon/Carbon.h>
 #import <Cocoa/Cocoa.h>
 
 #include "apps/app_shim/app_shim_mac.h"
 #include "base/command_line.h"
 #include "base/file_util.h"
 #include "base/files/file_enumerator.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/mac/foundation_util.h"
 #include "base/mac/launch_services_util.h"
 #include "base/mac/mac_util.h"
 #include "base/mac/scoped_cftyperef.h"
 #include "base/path_service.h"
+#include "base/process/process.h"
 #include "base/strings/string_util.h"
 #include "base/strings/string16.h"
+#include "base/strings/string_number_conversions.h"

[benwells, 2013/08/23 13:04:52]

Nit: move above string_util

[jackhou1, 2013/08/26 04:29:45]

Done.

 #include "base/strings/sys_string_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #import "chrome/browser/mac/dock.h"
 #include "chrome/common/chrome_constants.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/chrome_version_info.h"
 #include "chrome/common/extensions/extension.h"
 #import "chrome/common/mac/app_mode_common.h"
 #include "content/public/browser/browser_thread.h"
@@ skipping 171 matching lines @@
     // one in the web app's |app_data_dir_|.
     base::FilePath app_data_dir = web_app::GetWebAppDataDirectory(
         shortcut_info.profile_path, shortcut_info.extension_id, GURL());
     shim_path = app_data_dir.Append(shim_path.BaseName());
   }
 
   if (!base::PathExists(shim_path))
     return;
 
   CommandLine command_line(CommandLine::NO_PROGRAM);
-  command_line.AppendSwitch(app_mode::kNoLaunchApp);
+  command_line.AppendSwitchASCII(
+      app_mode::kLaunchedByChromeProcessId,
+      base::IntToString(base::Process::Current().pid()));

[Robert Sesek, 2013/08/23 18:47:32]

Use base::GetCurrentProcessId() in base/process/process_handle.h

[jackhou1, 2013/08/26 04:29:45]

Done.

   // Launch without activating (kLSLaunchDontSwitch).
   base::mac::OpenApplicationWithPath(
       shim_path, command_line, kLSLaunchDefaults | kLSLaunchDontSwitch, NULL);
 }
 
 base::FilePath GetAppLoaderPath() {
   return base::mac::PathForFrameworkBundleResource(
       base::mac::NSToCFCast(@"app_mode_loader.app"));
 }
 
@@ skipping 515 matching lines @@
     ShellIntegration::ShortcutInfo shortcut_info =
         BuildShortcutInfoFromBundle(*it);
     WebAppShortcutCreator shortcut_creator(it->DirName(), shortcut_info);
     shortcut_creator.DeleteShortcuts();
   }
 }
 
 }  // namespace internals
 
 }  // namespace web_app