Add new PathService paths for Windows' All Users Desktop and Quick Launch folders.

Re-commit, reverted in http://crrev.com/157680 (original commit in http://crrev.com/157667).

This allows usage of PathService to cache the shortcut install paths and more importantly to mock them in shortcut tests!

Also move chrome::DIR_USER_DESKTOP to base::DIR_USER_DESKTOP; this is really where it belongs. In fact it is only in chrome_paths.h because it used to be called DIR_DEFAULT_DOWNLOAD and cpu@ renamed it to DIR_USER_DESKTOP in http://crrev.com/1753 (early days!) after that it started to be used all over the place as the Desktop path. Finally bringing it to base_paths.h, beside DIR_START_MENU and friends, is the right thing to do imo.

[email protected]
BUG=148539
TEST=Quick Launch shortcut installed in the right place on XP (both Default and current user)
Desktop shortcuts installed in the right place (both All Users and per-user installs).

installer_util_unittests.exe --gtest_filter=ShellUtilShortcutTest*
unit_tests.exe --gtest_filter=ProfileShortcutManagerTest*
base_unittests --gtest_filter=PathServiceTest*

Review URL: https://chromiumcodereview.appspot.com/10964007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@157779 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/base/base_paths_android.h b/base/base_paths_android.h
index 8e59b87..7a9ac4a6 100644
--- a/base/base_paths_android.h
+++ b/base/base_paths_android.h
@@ -15,6 +15,7 @@
   PATH_ANDROID_START = 300,
 
   DIR_ANDROID_APP_DATA,  // Directory where to put Android app's data.
+  DIR_ANDROID_EXTERNAL_STORAGE,  // Android external storage directory.
 
   PATH_ANDROID_END
 };