Add configuration UI for virtual keyboards (C++ part).

The UI allows a user to use a specific virtual keyboard extension for each layout.

HTML/CSS/JS part is http://codereview.chromium.org/7676001/.

BUG=None (internal bug only)
TEST=ran unit_tests

Review URL: http://codereview.chromium.org/7670024

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@97873 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/chrome_browser.gypi b/chrome/chrome_browser.gypi
index d961699..a06ae38 100644
--- a/chrome/chrome_browser.gypi
+++ b/chrome/chrome_browser.gypi
@@ -3608,6 +3608,8 @@
         'browser/ui/webui/options/chromeos/system_settings_provider.h',
         'browser/ui/webui/options/chromeos/user_image_source.cc',
         'browser/ui/webui/options/chromeos/user_image_source.h',
+        'browser/ui/webui/options/chromeos/virtual_keyboard_manager_handler.cc',
+        'browser/ui/webui/options/chromeos/virtual_keyboard_manager_handler.h',
         'browser/ui/webui/options/clear_browser_data_handler.cc',
         'browser/ui/webui/options/clear_browser_data_handler.h',
         'browser/ui/webui/options/content_settings_handler.cc',