Added DataTypeController integration and UI surfacing for syncing Search Engines.

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
===================================================================
--- chrome/app/generated_resources.grd	(revision 98647)
+++ chrome/app/generated_resources.grd	(working copy)
@@ -4450,6 +4450,12 @@
       <message name="IDS_FLAGS_SYNC_SESSIONS_DESCRIPTION" desc="Description for the flag to enable syncing the Sessions datatype">
         Enable sessions in the sync options. This allows syncing your sessions to other clients.
       </message>
+      <message name="IDS_FLAGS_SYNC_SEARCH_ENGINES_NAME" desc="Title for the flag to enable syncing the Search Engines datatype">
+        Enable syncing search engines
+      </message>
+      <message name="IDS_FLAGS_SYNC_SEARCH_ENGINES_DESCRIPTION" desc="Description for the flag to enable syncing the Search Engines datatype">
+        Enable search engines in the sync options. This allows syncing your custom search engines to other clients.
+      </message>
       <message name="IDS_FLAGS_SYNC_OAUTH_NAME" desc="Title for the flag to enable authenticating with OAuth">
         Use OAuth to authenticate Sync operations.
       </message>
@@ -9731,6 +9737,9 @@
       <message name="IDS_SYNC_DATATYPE_APPS" desc="Apps, one of the data types that we allow syncing.">
         Apps
       </message>
+      <message name="IDS_SYNC_DATATYPE_SEARCH_ENGINES" desc="Search Engines, one of the data types that we allow syncing.">
+        Search Engines
+      </message>
       <message name="IDS_SYNC_DATATYPE_SESSIONS" desc="Sessions, one of the data types that we allow syncing.">
         Foreign Sessions
       </message>