Add TRACE_EVENT markers to various keyboard functions

ash/virtual_keyboard_controller.cc

 // Copyright 2014 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 "ash/virtual_keyboard_controller.h"
 
 #include <vector>
 
 #include "ash/keyboard/keyboard_ui.h"
 #include "ash/root_window_controller.h"
@@ skipping 16 matching lines @@
 namespace {
 
 // Checks whether smart deployment is enabled.
 bool IsSmartVirtualKeyboardEnabled() {
   return !base::CommandLine::ForCurrentProcess()->HasSwitch(
       keyboard::switches::kEnableVirtualKeyboard);
 }
 
 void MoveKeyboardToDisplayInternal(const int64_t display_id) {
   // Remove the keyboard from curent root window controller
+  TRACE_EVENT0("vk", "MoveKeyboardToDisplayInternal");
   Shell::Get()->keyboard_ui()->Hide();
   RootWindowController::ForWindow(
       keyboard::KeyboardController::GetInstance()->GetContainerWindow())
       ->DeactivateKeyboard(keyboard::KeyboardController::GetInstance());
 
   for (RootWindowController* controller :
        Shell::Get()->GetAllRootWindowControllers()) {
     if (display::Screen::GetScreen()
             ->GetDisplayNearestWindow(controller->GetRootWindow())
             .id() == display_id) {
@@ skipping 57 matching lines @@
 
 void VirtualKeyboardController::ToggleIgnoreExternalKeyboard() {
   ignore_external_keyboard_ = !ignore_external_keyboard_;
   UpdateKeyboardEnabled();
 }
 
 void VirtualKeyboardController::MoveKeyboardToDisplay(int64_t display_id) {
   DCHECK(keyboard::KeyboardController::GetInstance() != nullptr);
   DCHECK(display_id != display::kInvalidDisplayId);
 
+  TRACE_EVENT0("vk", "MoveKeyboardToDisplay");
+
   aura::Window* container =
       keyboard::KeyboardController::GetInstance()->GetContainerWindow();
   DCHECK(container != nullptr);
   const display::Screen* screen = display::Screen::GetScreen();
   const display::Display current_display =
       screen->GetDisplayNearestWindow(container);
 
   if (display_id != current_display.id())
     MoveKeyboardToDisplayInternal(display_id);
 }
 
 void VirtualKeyboardController::MoveKeyboardToTouchableDisplay() {
   DCHECK(keyboard::KeyboardController::GetInstance() != nullptr);
 
+  TRACE_EVENT0("vk", "MoveKeyboardToTouchableDisplay");
+
   aura::Window* container =
       keyboard::KeyboardController::GetInstance()->GetContainerWindow();
   DCHECK(container != nullptr);
 
   const display::Screen* screen = display::Screen::GetScreen();
   const display::Display current_display =
       screen->GetDisplayNearestWindow(container);
 
   if (wm::GetFocusedWindow() != nullptr) {
     // Move the virtual keyboard to the focused display if that display has
@@ skipping 67 matching lines @@
   if (is_enabled == was_enabled)
     return;
   if (is_enabled) {
     Shell::Get()->CreateKeyboard();
   } else {
     Shell::Get()->DeactivateKeyboard();
   }
 }
 
 }  // namespace ash