Use Drive v2 API: enable behind --enable-drive-api flag

chrome/browser/chromeos/gdata/gdata_system_service.cc

Index: chrome/browser/chromeos/gdata/gdata_system_service.cc
diff --git a/chrome/browser/chromeos/gdata/gdata_system_service.cc b/chrome/browser/chromeos/gdata/gdata_system_service.cc
index fd7f7f14e9fd9a7b98c47d5d3d916b020acfefec..7b18ad0201696853413cf11218fac879dc3b4043 100644
--- a/chrome/browser/chromeos/gdata/gdata_system_service.cc
+++ b/chrome/browser/chromeos/gdata/gdata_system_service.cc
@@ -6,6 +6,7 @@
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
+#include "base/command_line.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/download/download_service.h"
 #include "chrome/browser/download/download_service_factory.h"
@@ -19,6 +20,7 @@
 #include "chrome/browser/chromeos/gdata/gdata_util.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_dependency_manager.h"
+#include "chrome/common/chrome_switches.h"
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/browser_thread.h"
 #include "webkit/fileapi/file_system_context.h"
@@ -63,8 +65,15 @@ GDataSystemService::~GDataSystemService() {
 void GDataSystemService::Initialize() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
+
+  if (CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kEnableDriveV2Api)) {
+    DVLOG(1) << "Using Drive v2 API.";
+    use_drive_api_ = true;
+  }
+
   sync_client_->Initialize();
-  file_system_->Initialize();
+  file_system_->Initialize(use_drive_api_);
   cache_->RequestInitializeOnUIThread();
 
   content::DownloadManager* download_manager =