Add metrics to measure time elapsed between form load and form submission with or without Autofill.

chrome/renderer/autofill/form_autocomplete_browsertest.cc

 // Copyright (c) 2011 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 "chrome/common/autofill_messages.h"
 #include "chrome/test/base/render_view_test.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebDocument.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebFormElement.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebString.h"
@@ skipping 17 matching lines @@
            "<input name='lname' value='Deckard'/></form></html>");
 
   // Submit the form.
   ExecuteJavaScript("document.getElementById('myForm').submit();");
   ProcessPendingMessages();
 
   const IPC::Message* message = render_thread_.sink().GetFirstMessageMatching(
       AutofillHostMsg_FormSubmitted::ID);
   ASSERT_TRUE(message != NULL);
 
-  Tuple1<FormData> forms;
+  Tuple2<FormData, int64> forms;  // also includes timestamp, which is ignored
   AutofillHostMsg_FormSubmitted::Read(message, &forms);
   ASSERT_EQ(2U, forms.a.fields.size());
 
   webkit_glue::FormField& form_field = forms.a.fields[0];
   EXPECT_EQ(WebString("fname"), form_field.name);
   EXPECT_EQ(WebString("Rick"), form_field.value);
 
   form_field = forms.a.fields[1];
   EXPECT_EQ(WebString("lname"), form_field.name);
   EXPECT_EQ(WebString("Deckard"), form_field.value);
@@ skipping 27 matching lines @@
 
   // Submit the form.
   ExecuteJavaScript("document.getElementById('myForm').submit();");
   ProcessPendingMessages();
 
   // No FormSubmitted message should have been sent.
   const IPC::Message* message = render_thread_.sink().GetFirstMessageMatching(
       AutofillHostMsg_FormSubmitted::ID);
   ASSERT_TRUE(message != NULL);
 
-  Tuple1<FormData> forms;
+  Tuple2<FormData, int64> forms;  // also includes timestamp, which is ignored
   AutofillHostMsg_FormSubmitted::Read(message, &forms);
   ASSERT_EQ(1U, forms.a.fields.size());
 
   webkit_glue::FormField& form_field = forms.a.fields[0];
   EXPECT_EQ(WebString("fname"), form_field.name);
   EXPECT_EQ(WebString("Rick"), form_field.value);
 }
 
 // Tests that submitting a form that has been dynamically set as autocomplete
 // off does not generate a FormSubmitted message.
@@ skipping 15 matching lines @@
   EXPECT_FALSE(form.autoComplete());
 
   // Submit the form.
   ExecuteJavaScript("document.getElementById('myForm').submit();");
   ProcessPendingMessages();
 
   // No FormSubmitted message should have been sent.
   EXPECT_FALSE(render_thread_.sink().GetFirstMessageMatching(
       AutofillHostMsg_FormSubmitted::ID));
 }