Install platform apps into a separate data directory

chrome/common/mac/app_mode_common.h

Index: chrome/common/mac/app_mode_common.h
diff --git a/chrome/common/mac/app_mode_common.h b/chrome/common/mac/app_mode_common.h
index ab90237ee7c371e2ac7b95942083c368cff5a804..03231e6699869237cc4c29abe11bc759872fb417 100644
--- a/chrome/common/mac/app_mode_common.h
+++ b/chrome/common/mac/app_mode_common.h
@@ -32,6 +32,9 @@ extern NSString* const kCrAppModeShortcutURLKey;
 // Key for the app user data directory.
 extern NSString * const kCrAppModeUserDataDirKey;
 
+// Key for the app's extension path.
+extern NSString * const kCrAppModeExtensionPathKey;
+
 // When the Chrome browser is run, it stores it's location in the defaults
 // system using this key.
 extern NSString* const kLastRunAppBundlePathPrefsKey;
@@ -89,6 +92,9 @@ struct ChromeAppModeInfo {
 
   // Path to the app's user data directory.
   FilePath user_data_dir;
+
+  // Path to the app's extension.
+  FilePath extension_path;
 };
 
 }  // namespace app_mode