Track input latency with UMA stats

chrome/browser/ui/panels/panel_browsertest.cc

 // Copyright (c) 2012 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/bind.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/app/chrome_command_ids.h"
 #include "chrome/browser/devtools/devtools_window.h"
 #include "chrome/browser/extensions/extension_apitest.h"
 #include "chrome/browser/net/url_request_mock_util.h"
@@ skipping 23 matching lines @@
 #include "chrome/test/base/ui_test_utils.h"
 #include "content/public/browser/native_web_keyboard_event.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/common/url_constants.h"
 #include "content/public/test/browser_test_utils.h"
 #include "content/test/net/url_request_mock_http_job.h"
 #include "extensions/common/constants.h"
 #include "net/base/net_util.h"
 #include "testing/gtest/include/gtest/gtest.h"
+#include "ui/base/events/event_utils.h"
 #include "ui/gfx/screen.h"
 
 using content::WebContents;
 using extensions::Extension;
 
 class PanelBrowserTest : public BasePanelBrowserTest {
  public:
   PanelBrowserTest() : BasePanelBrowserTest() {
   }
 
@@ skipping 1659 matching lines @@
       FilePath(FILE_PATH_LITERAL("update-preferred-size.html"))));
   params.url = url;
   Panel* panel = CreatePanelWithParams(params);
   EXPECT_EQ(1, panel_manager->num_panels());
 
   // Close the panel by acclerator.
   content::WindowedNotificationObserver signal(
       chrome::NOTIFICATION_PANEL_CLOSED,
       content::Source<Panel>(panel));
 #if defined(USE_AURA)
+  double now = ui::EventTimeForNow().InSecondsF();
   content::NativeWebKeyboardEvent key_event(
       ui::ET_KEY_PRESSED,
       false,
       ui::VKEY_W,
       ui::EF_CONTROL_DOWN,
-      base::Time::Now().ToDoubleT());
+      now);
 #elif defined(OS_WIN)
   ::MSG key_msg = { NULL, WM_KEYDOWN, ui::VKEY_W, 0 };
   content::NativeWebKeyboardEvent key_event(key_msg);
   key_event.modifiers = content::NativeWebKeyboardEvent::ControlKey;
 #else
   content::NativeWebKeyboardEvent key_event;
 #endif
   panel->HandleKeyboardEvent(key_event);
   signal.Wait();
   EXPECT_EQ(0, panel_manager->num_panels());
@@ skipping 14 matching lines @@
 #else
 #define MAYBE_FocusChangeEventOnMinimize FocusChangeEventOnMinimize
 #endif
 IN_PROC_BROWSER_TEST_F(PanelExtensionApiTest,
                        MAYBE_FocusChangeEventOnMinimize) {
   // This is needed so the subsequently created panels can be activated.
   // On a Mac, it transforms background-only test process into foreground one.
   ASSERT_TRUE(ui_test_utils::BringBrowserWindowToFront(browser()));
   ASSERT_TRUE(RunExtensionTest("panels/focus_change_on_minimize")) << message_;
 }