Ensure that MergeDataAndStartSyncing considers already synced entries when setting the synced DSP.

chrome/browser/search_engines/template_url_service_sync_unittest.cc

Index: chrome/browser/search_engines/template_url_service_sync_unittest.cc
===================================================================
--- chrome/browser/search_engines/template_url_service_sync_unittest.cc	(revision 151691)
+++ chrome/browser/search_engines/template_url_service_sync_unittest.cc	(working copy)
@@ -1570,6 +1570,40 @@
   ASSERT_EQ(default_search, model()->GetDefaultSearchProvider());
 }
 
+TEST_F(TemplateURLServiceSyncTest, NewDefaultIsAlreadySynced) {
+  // Ensure that if the synced DSP pref changed to another synced entry (as
+  // opposed to coming in as a new entry), it gets reset correctly.
+  // Start by setting kSyncedDefaultSearchProviderGUID to the entry that should
+  // end up as the default. Note that this must be done before the initial
+  // entries are added as otherwise this call will set the DSP immediately.
+  profile_a()->GetTestingPrefService()->SetString(
+      prefs::kSyncedDefaultSearchProviderGUID, "key2");
+
+  syncer::SyncDataList initial_data = CreateInitialSyncData();
+  // Ensure that our candidate default supports replacement.
+  scoped_ptr<TemplateURL> turl(CreateTestTemplateURL(ASCIIToUTF16("key2"),
+      "http://key2.com/{searchTerms}", "key2", 90));
+  initial_data[1] = TemplateURLService::CreateSyncDataFromTemplateURL(*turl);
+  for (syncer::SyncDataList::const_iterator iter = initial_data.begin();
+      iter != initial_data.end(); ++iter) {
+    TemplateURL* converted = Deserialize(*iter);
+    model()->Add(converted);
+  }
+
+  // Set the initial default to something other than the desired default.
+  model()->SetDefaultSearchProvider(model()->GetTemplateURLForGUID("key1"));
+
+  // Merge in the same data (i.e. already synced entries).
+  model()->MergeDataAndStartSyncing(syncer::SEARCH_ENGINES, initial_data,
+      PassProcessor(), CreateAndPassSyncErrorFactory());
+
+  EXPECT_EQ(3U, model()->GetAllSyncData(syncer::SEARCH_ENGINES).size());
+  TemplateURL* current_default = model()->GetDefaultSearchProvider();
+  ASSERT_TRUE(current_default);
+  EXPECT_EQ("key2", current_default->sync_guid());
+  EXPECT_EQ(ASCIIToUTF16("key2"), current_default->keyword());
+}
+
 TEST_F(TemplateURLServiceSyncTest, SyncWithManagedDefaultSearch) {
   // First start off with a few entries and make sure we can set an unmanaged
   // default search provider.