Install platform apps into a separate data directory

chrome/app/app_mode_loader_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.
 
 // On Mac, shortcuts can't have command-line arguments. Instead, produce small
 // app bundles which locate the Chromium framework and load it, passing the
 // appropriate data. This is the code for such an app bundle. It should be kept
 // minimal and do as little work as possible (with as much work done on
 // framework side as possible).
 
 #include <dlfcn.h>
 
 #include <CoreFoundation/CoreFoundation.h>
 #import <Foundation/Foundation.h>
 
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/logging.h"
+#include "base/mac/foundation_util.h"
 #include "base/mac/scoped_nsautorelease_pool.h"
 #include "base/sys_string_conversions.h"
 #import "chrome/common/mac/app_mode_chrome_locator.h"
 #include "chrome/common/mac/app_mode_common.h"
 
 namespace {
 
 void LoadFramework(void** cr_dylib, app_mode::ChromeAppModeInfo* info) {
   using base::SysNSStringToUTF8;
   using base::SysNSStringToUTF16;
@@ skipping 56 matching lines @@
   info->app_mode_short_name = SysNSStringToUTF16(
       [info_plist objectForKey:app_mode::kCrAppModeShortcutShortNameKey]);
 
   info->app_mode_name = SysNSStringToUTF16(
       [info_plist objectForKey:app_mode::kCrAppModeShortcutNameKey]);
 
   info->app_mode_url = SysNSStringToUTF8(
       [info_plist objectForKey:app_mode::kCrAppModeShortcutURLKey]);
   CHECK(info->app_mode_url.size()) << "couldn't get app shortcut URL";
 
+  info->user_data_dir = base::mac::NSStringToFilePath(
+      [info_plist objectForKey:app_mode::kCrAppModeUserDataDirKey]);
+
   // Open the framework.
   *cr_dylib = dlopen(framework_shlib_path.value().c_str(), RTLD_LAZY);
   CHECK(cr_dylib) << "couldn't load framework: " << dlerror();
 }
 
 } // namespace
 
 __attribute__((visibility("default")))
 int main(int argc, char** argv) {
   app_mode::ChromeAppModeInfo info;
@@ skipping 10 matching lines @@
 
   typedef int (*StartFun)(const app_mode::ChromeAppModeInfo*);
   StartFun ChromeAppModeStart = (StartFun)dlsym(cr_dylib, "ChromeAppModeStart");
   CHECK(ChromeAppModeStart) << "couldn't get entry point";
 
   // Exit instead of returning to avoid the the removal of |main()| from stack
   // backtraces under tail call optimization.
   int rv = ChromeAppModeStart(&info);
   exit(rv);
 }