Add TRACE_EVENT markers to various keyboard functions

ui/keyboard/keyboard_ui.cc

 // Copyright 2015 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_ui.h"
 
 #include "base/command_line.h"
 #include "ui/aura/window.h"
 #include "ui/base/ime/input_method.h"
 #include "ui/base/ime/text_input_client.h"
 #include "ui/base/ui_base_switches.h"
 #include "ui/keyboard/keyboard_controller.h"
 
 namespace keyboard {
 
 KeyboardUI::KeyboardUI() : keyboard_controller_(nullptr) {}
 KeyboardUI::~KeyboardUI() {}
 
 void KeyboardUI::ShowKeyboardContainer(aura::Window* container) {
   if (HasKeyboardWindow()) {
-    GetKeyboardWindow()->Show();
-    container->Show();
+    {
+      TRACE_EVENT0("vk", "ShowKeyboardContainerWindow");
+      GetKeyboardWindow()->Show();
+    }
+    {
+      TRACE_EVENT0("vk", "ShowKeyboardContainer");
+      container->Show();
+    }
   }
 }
 
 void KeyboardUI::HideKeyboardContainer(aura::Window* container) {
   if (HasKeyboardWindow()) {
     container->Hide();
     GetKeyboardWindow()->Hide();
   }
 }
 
@@ skipping 19 matching lines @@
     GetInputMethod()->GetTextInputClient()->EnsureCaretNotInRect(
         keyboard_bounds_in_screen);
   }
 }
 
 void KeyboardUI::SetController(KeyboardController* controller) {
   keyboard_controller_ = controller;
 }
 
 }  // namespace keyboard