[Autofill] Control using Variations the sending of Autofill field metadata

chrome/browser/autofill/autofill_server_browsertest.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "base/command_line.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/message_loop/message_loop.h"
 #include "base/prefs/pref_service.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/autofill/personal_data_manager_factory.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
+#include "chrome/common/chrome_switches.h"
 #include "chrome/test/base/in_process_browser_test.h"
 #include "chrome/test/base/ui_test_utils.h"
 #include "components/autofill/core/browser/autofill_profile.h"
 #include "components/autofill/core/browser/autofill_test_utils.h"
 #include "components/autofill/core/browser/personal_data_manager.h"
 #include "components/autofill/core/browser/personal_data_manager_observer.h"
 #include "components/autofill/core/common/autofill_pref_names.h"
 #include "content/public/test/browser_test_utils.h"
 #include "content/public/test/test_utils.h"
 #include "net/url_request/test_url_fetcher_factory.h"
@@ skipping 62 matching lines @@
   const std::string expected_upload_data_;
   scoped_refptr<content::MessageLoopRunner> message_loop_runner_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowedNetworkObserver);
 };
 
 }  // namespace
 
 class AutofillServerTest : public InProcessBrowserTest  {
  public:
+  void SetUpCommandLine(base::CommandLine* command_line) override {
+    // Enable finch experiment for sending field metadata.
+    command_line->AppendSwitchASCII(
+        ::switches::kForceFieldTrials, "AutofillFieldMetadata/Enabled/");
+  }
+
   void SetUpOnMainThread() override {
     // Disable interactions with the Mac Keychain.
     PrefService* pref_service = browser()->profile()->GetPrefs();
     test::DisableSystemServices(pref_service);
 
     // Enable uploads, and load a new tab to force the AutofillDownloadManager
     // to update its cached view of the prefs.
     pref_service->SetDouble(prefs::kAutofillPositiveUploadRate, 1.0);
     pref_service->SetDouble(prefs::kAutofillNegativeUploadRate, 1.0);
     AddBlankTabAndShow(browser());
@@ skipping 88 matching lines @@
       "<field signature=\"2750915947\" name=\"two\" type=\"text\"/>"
       "<field signature=\"116843943\" name=\"three\" type=\"password\"/>"
       "</form></autofillquery>";
   WindowedNetworkObserver query_network_observer(kQueryRequest);
   ui_test_utils::NavigateToURL(
       browser(), GURL(std::string(kDataURIPrefix) + kFormHtml));
   query_network_observer.Wait();
 }
 
 }  // namespace autofill