Add source column to chrome://policy showing the origins of policies.

chrome/browser/chromeos/system/tray_accessibility_browsertest.cc

Index: chrome/browser/chromeos/system/tray_accessibility_browsertest.cc
diff --git a/chrome/browser/chromeos/system/tray_accessibility_browsertest.cc b/chrome/browser/chromeos/system/tray_accessibility_browsertest.cc
index f09b6b972a587bfda6ededd292585b3ed1b3aeb1..2badedad77f2c8ed5044f5762675b0fe4c80d8a5 100644
--- a/chrome/browser/chromeos/system/tray_accessibility_browsertest.cc
+++ b/chrome/browser/chromeos/system/tray_accessibility_browsertest.cc
@@ -104,6 +104,7 @@ class TrayAccessibilityTest
       policy_map.Set(policy::key::kShowAccessibilityOptionsInSystemTrayMenu,
                      policy::POLICY_LEVEL_MANDATORY,
                      policy::POLICY_SCOPE_USER,
+                     policy::POLICY_SOURCE_CLOUD,
                      new base::FundamentalValue(value),
                      NULL);
       provider_.UpdateChromePolicy(policy_map);