Limit display of the virtual keyboard to state changes triggered from a user gesture.

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 148 matching lines @@
   }
   return true;
 }
 
 const void MarkKeyboardLoadStarted() {
   if (!g_keyboard_load_time_start.Get().ToInternalValue())
     g_keyboard_load_time_start.Get() = base::Time::Now();
 }
 
 const 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())
+    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.FirstLoadTime",
         base::Time::Now() - g_keyboard_load_time_start.Get());
@@ skipping 72 matching lines @@
 }
 
 void LogKeyboardControlEvent(KeyboardControlEvent event) {
   UMA_HISTOGRAM_ENUMERATION(
       "VirtualKeyboard.KeyboardControlEvent",
       event,
       keyboard::KEYBOARD_CONTROL_MAX);
 }
 
 }  // namespace keyboard