Setup field trial for one-click signin inforbar.

chrome/chrome_browser.gypi

Index: chrome/chrome_browser.gypi
diff --git a/chrome/chrome_browser.gypi b/chrome/chrome_browser.gypi
index f9eb0445210c1a9c32ce52dd1dd19d696479ee58..0410b58d4f8fccb269f325a4225a34b7f662e0af 100644
--- a/chrome/chrome_browser.gypi
+++ b/chrome/chrome_browser.gypi
@@ -140,6 +140,8 @@
         'browser/api/infobars/infobar_service.h',
         'browser/api/infobars/link_infobar_delegate.cc',
         'browser/api/infobars/link_infobar_delegate.h',
+        'browser/api/infobars/one_click_signin_infobar_delegate.cc',
+        'browser/api/infobars/one_click_signin_infobar_delegate.h',
         'browser/api/infobars/simple_alert_infobar_delegate.cc',
         'browser/api/infobars/simple_alert_infobar_delegate.h',
         'browser/api/prefs/pref_change_registrar.cc',
@@ -2053,6 +2055,12 @@
         '<(SHARED_INTERMEDIATE_DIR)/autofill_regex_constants.cc',
       ],
       'conditions': [
+        ['enable_one_click_signin==0', {
+          'sources!': [
+            'browser/api/infobars/one_click_signin_infobar_delegate.cc',
+            'browser/api/infobars/one_click_signin_infobar_delegate.h',
+          ],
+        }],
         ['enable_extensions==1', {
           'sources': [
             # Only extension API implementations should go here.