Create a copy of each app's shim bundle in the app's app_data_path.

chrome/browser/web_applications/web_app_mac.h

Index: chrome/browser/web_applications/web_app_mac.h
diff --git a/chrome/browser/web_applications/web_app_mac.h b/chrome/browser/web_applications/web_app_mac.h
index 676b20872badfb171ce62fa197b24a3fd63d1a50..282b03fe8a52adb59884d4fd29c5d154466e500b 100644
--- a/chrome/browser/web_applications/web_app_mac.h
+++ b/chrome/browser/web_applications/web_app_mac.h
@@ -33,10 +33,10 @@ void MaybeLaunchShortcut(const ShellIntegration::ShortcutInfo& shortcut_info);
 class WebAppShortcutCreator {
  public:
   // Creates a new shortcut based on information in |shortcut_info|.
-  // The shortcut stores its user data directory in |user_data_dir|.
+  // The shortcut stores its user data directory in |web_app_path|.

[benwells, 2013/06/13 00:13:31]

This comment doesn't make sense, it was from an earlier era where we ran apps in
their own user data directory.

Update it to describe what web_app_path is now used for.

[jackhou1, 2013/06/13 01:33:43]

Done.

   // |chrome_bundle_id| is the CFBundleIdentifier of the Chrome browser bundle.
   WebAppShortcutCreator(
-      const base::FilePath& user_data_dir,
+      const base::FilePath& web_app_path,
       const ShellIntegration::ShortcutInfo& shortcut_info,
       const string16& chrome_bundle_id);
 
@@ -69,11 +69,6 @@ class WebAppShortcutCreator {
   // the app.
   bool UpdateDisplayName(const base::FilePath& app_path) const;
 
-  // Path to the app's user data directory. For example:
-  // ~/Library/Application Support/Chromium/Default/Web Applications/_crx_abc/
-  // Note, the user data directory is the parent of the profile directory.
-  base::FilePath user_data_dir_;
-
   // Returns the bundle identifier to use for this app bundle.
   // |plist| is a dictionary containg a copy of the template plist file to
   // be used for creating the app bundle.
@@ -83,6 +78,10 @@ class WebAppShortcutCreator {
   virtual void RevealGeneratedBundleInFinder(
       const base::FilePath& generated_bundle) const;
 
+  // Path to the app's user data directory. For example:

[benwells, 2013/06/13 00:13:31]

Ditto. This isn't the app's user data directory.

[jackhou1, 2013/06/13 01:33:43]

Done.

+  // ~/Library/Application Support/Chromium/Default/Web Applications/_crx_abc/
+  base::FilePath web_app_path_;
+
   // Information about the app.
   ShellIntegration::ShortcutInfo info_;