[Sync] Add support for performing a GetKey on startup.

chrome/browser/sync/test/integration/sync_test.cc

Index: chrome/browser/sync/test/integration/sync_test.cc
diff --git a/chrome/browser/sync/test/integration/sync_test.cc b/chrome/browser/sync/test/integration/sync_test.cc
index 25427181625e4e7b4ac72c4c8d2b7764c6c4d09d..a1ee3eaca546ac8a0999ca4e395e01cf55974fed 100644
--- a/chrome/browser/sync/test/integration/sync_test.cc
+++ b/chrome/browser/sync/test/integration/sync_test.cc
@@ -197,6 +197,10 @@ void SyncTest::AddTestSwitches(CommandLine* cl) {
   // Disable non-essential access of external network resources.
   if (!cl->HasSwitch(switches::kDisableBackgroundNetworking))
     cl->AppendSwitch(switches::kDisableBackgroundNetworking);
+
+  // TODO(sync): remove this once keystore encryption is enabled by default.
+  if (!cl->HasSwitch(switches::kSyncKeystoreEncryption))
+    cl->AppendSwitch(switches::kSyncKeystoreEncryption);
 }
 
 void SyncTest::AddOptionalTypesToCommandLine(CommandLine* cl) {}