Fix 'VirtualKeyboard.InitLatency.FirstLoad' metrics to be recorded for any keyboards.

ui/keyboard/keyboard_util.cc

 // Copyright (c) 2013 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 "ui/keyboard/keyboard_util.h"
 
 #include <string>
 
 #include "base/command_line.h"
 #include "base/lazy_instance.h"
@@ skipping 351 matching lines @@
     } else {
       ui::EventDispatchDetails details =
           host->event_sink()->OnEventFromSource(&event);
       CHECK(!details.dispatcher_destroyed);
     }
   }
   return true;
 }
 
 void MarkKeyboardLoadStarted() {
-  if (!g_keyboard_load_time_start.Get().ToInternalValue())
+  if (g_keyboard_load_time_start.Get().is_null())
     g_keyboard_load_time_start.Get() = base::Time::Now();
 }
 
 void MarkKeyboardLoadFinished() {
   // Possible to get a load finished without a start if navigating directly to
   // chrome://keyboard.
-  if (!g_keyboard_load_time_start.Get().ToInternalValue())
+  if (g_keyboard_load_time_start.Get().is_null())
     return;
 
-  // It should not be possible to finish loading the keyboard without starting
-  // to load it first.
-  DCHECK(g_keyboard_load_time_start.Get().ToInternalValue());
-
   static bool logged = false;
   if (!logged) {
     // Log the delta only once.
     UMA_HISTOGRAM_TIMES(
         "VirtualKeyboard.InitLatency.FirstLoad",
         base::Time::Now() - g_keyboard_load_time_start.Get());
     logged = true;
   }
 }
 
 void LogKeyboardControlEvent(KeyboardControlEvent event) {
   UMA_HISTOGRAM_ENUMERATION("VirtualKeyboard.KeyboardControlEvent", event,
                             KEYBOARD_CONTROL_MAX);
 }
 
 void SetOverscrollEnabledWithAccessibilityKeyboard(bool enabled) {
   g_overscroll_enabled_with_accessibility_keyboard = enabled;
 }
 
 }  // namespace keyboard