[Sync] Adds a new switch for enabling the new local server backend.

components/sync/engine_impl/sync_manager_impl.cc

Index: components/sync/engine_impl/sync_manager_impl.cc
diff --git a/components/sync/engine_impl/sync_manager_impl.cc b/components/sync/engine_impl/sync_manager_impl.cc
index 6a6b6be47af77cb933e81dc0724ba6d5b1d49e3a..fc8dfb197cc997e718adf7620b9d848bc89ebf47 100644
--- a/components/sync/engine_impl/sync_manager_impl.cc
+++ b/components/sync/engine_impl/sync_manager_impl.cc
@@ -11,6 +11,7 @@
 #include "base/base64.h"
 #include "base/bind.h"
 #include "base/callback.h"
+#include "base/command_line.h"

[pavely, 2016/10/27 23:53:39]

I don't think you use CommandLine in this file.

[pastarmovj, 2016/11/02 13:39:25]

Done.

 #include "base/compiler_specific.h"
 #include "base/json/json_writer.h"
 #include "base/memory/ptr_util.h"
@@ -46,6 +47,10 @@
 #include "components/sync/syncable/write_node.h"
 #include "components/sync/syncable/write_transaction.h"
 
+#if defined(OS_WIN)
+#include "components/sync/engine_impl/loopback_server/loopback_connection_manager.h"
+#endif
+
 using base::TimeDelta;
 using sync_pb::GetUpdatesCallerInfo;
 
@@ -281,11 +286,21 @@ void SyncManagerImpl::Init(InitArgs* args) {
     args->saved_nigori_state.reset();
   }
 
-  connection_manager_ = base::MakeUnique<SyncServerConnectionManager>(
-      args->service_url.host() + args->service_url.path(),
-      args->service_url.EffectiveIntPort(),
-      args->service_url.SchemeIsCryptographic(), args->post_factory.release(),
-      args->cancelation_signal);
+  if (args->enable_local_sync_backend) {
+#if defined(OS_WIN)
+    VLOG(1) << "Running against local sync backend.";
+    connection_manager_ = base::MakeUnique<LoopbackConnectionManager>(
+        args->cancelation_signal, args->local_sync_backend_folder);
+#else
+    NOTREACHED();
+#endif  // defined(OS_WIN)
+  } else {
+    connection_manager_ = base::MakeUnique<SyncServerConnectionManager>(
+        args->service_url.host() + args->service_url.path(),
+        args->service_url.EffectiveIntPort(),
+        args->service_url.SchemeIsCryptographic(), args->post_factory.release(),
+        args->cancelation_signal);
+  }
   connection_manager_->set_client_id(directory()->cache_guid());
   connection_manager_->AddListener(this);