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

chrome/browser/search/contextual_search_policy_handler_android_unittest.cc

Index: chrome/browser/search/contextual_search_policy_handler_android_unittest.cc
diff --git a/chrome/browser/search/contextual_search_policy_handler_android_unittest.cc b/chrome/browser/search/contextual_search_policy_handler_android_unittest.cc
index 1b494f0b9650488ff0260d91671e3ee1f59fc999..7ad34f1082d2a63b4a0c0304727fa943d7d08ed1 100644
--- a/chrome/browser/search/contextual_search_policy_handler_android_unittest.cc
+++ b/chrome/browser/search/contextual_search_policy_handler_android_unittest.cc
@@ -27,6 +27,7 @@ TEST(ContextualSearchPolicyHandlerAndroidTest, Enabled) {
   policy.Set(key::kContextualSearchEnabled,
              POLICY_LEVEL_MANDATORY,
              POLICY_SCOPE_USER,
+             POLICY_SOURCE_PLATFORM,
              new base::FundamentalValue(true),
              NULL);
   PrefValueMap prefs;
@@ -44,6 +45,7 @@ TEST(ContextualSearchPolicyHandlerAndroidTest, Disabled) {
   policy.Set(key::kContextualSearchEnabled,
              POLICY_LEVEL_MANDATORY,
              POLICY_SCOPE_USER,
+             POLICY_SOURCE_PLATFORM,
              new base::FundamentalValue(false),
              NULL);
   PrefValueMap prefs;