[Win] Add a fast profile switcher to the Windows taskbar item.

chrome/browser/ui/startup/startup_browser_creator.cc

 // 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.
 
 #include "chrome/browser/ui/startup/startup_browser_creator.h"
 
 #include <algorithm>   // For max().
 #include <set>
 
 #include "apps/app_load_service.h"
@@ skipping 605 matching lines @@
 
     // Return early here since we don't want to open a browser window.
     // The exception is when there are no browser windows, since we don't want
     // chrome to shut down.
     // TODO(jackhou): Do this properly once keep-alive is handled by the
     // background page of apps. Tracked at http://crbug.com/175381
     if (chrome::GetTotalBrowserCountForProfile(last_used_profile) != 0)
       return true;
   }
 
+  if (command_line.HasSwitch(switches::kReuseExistingProfileBrowser)) {

[tapted, 2014/11/03 23:57:06]

an OWNER here might have a different opinion, but WDYT about putting this in
`ProcessCommandLineAlreadyRunning`? A browser can only be found if the profile
is loaded, so the asynchronous path doesn't need to be handled, and putting it
there puts the switch check nearer the GetProfileByPath call which feels kinda
nice.

[noms (inactive), 2014/11/04 20:03:09]

Done.

+    Browser* browser = chrome::FindTabbedBrowser(last_used_profile, false,

[tapted, 2014/11/03 23:57:06]

nit: one arg per line.

[noms (inactive), 2014/11/04 20:03:09]

Done.

+        chrome::HOST_DESKTOP_TYPE_NATIVE);
+    if (browser) {
+      browser->window()->Activate();
+      return true;
+    }
+  }
+
   chrome::startup::IsProcessStartup is_process_startup = process_startup ?
       chrome::startup::IS_PROCESS_STARTUP :
       chrome::startup::IS_NOT_PROCESS_STARTUP;
   chrome::startup::IsFirstRun is_first_run = first_run::IsChromeFirstRun() ?
       chrome::startup::IS_FIRST_RUN : chrome::startup::IS_NOT_FIRST_RUN;
   // |last_opened_profiles| will be empty in the following circumstances:
   // - This is the first launch. |last_used_profile| is the initial profile.
   // - The user exited the browser by closing all windows for all
   // profiles. |last_used_profile| is the profile which owned the last open
   // window.
@@ skipping 134 matching lines @@
   // If we are showing the app list then chrome isn't shown so load the app
   // list's profile rather than chrome's.
   if (command_line.HasSwitch(switches::kShowAppList)) {
     return AppListService::Get(chrome::HOST_DESKTOP_TYPE_NATIVE)->
         GetProfilePath(user_data_dir);
   }
 
   return g_browser_process->profile_manager()->GetLastUsedProfileDir(
       user_data_dir);
 }