Add TRACE_EVENT markers to various keyboard functions

ui/keyboard/keyboard_controller.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_controller.h"
 
 #include <set>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 228 matching lines @@
     if (keyboard::IsKeyboardOverscrollEnabled())
       ui_->InitInsets(new_bounds);
     else
       ui_->ResetInsets();
   } else {
     current_keyboard_bounds_ = gfx::Rect();
   }
 }
 
 void KeyboardController::HideKeyboard(HideReason reason) {
+  TRACE_EVENT0("vk", "HideKeyboard");

[yhanada, 2017/06/06 10:42:35]

Can you use longer name for the trace marker group? "virtual_keyboard"?

+
   keyboard_visible_ = false;
   ToggleTouchEventLogging(true);
 
   keyboard::LogKeyboardControlEvent(
       reason == HIDE_REASON_AUTOMATIC ?
           keyboard::KEYBOARD_CONTROL_HIDE_AUTO :
           keyboard::KEYBOARD_CONTROL_HIDE_USER);
 
   NotifyKeyboardBoundsChanging(gfx::Rect());
 
@@ skipping 111 matching lines @@
     show_on_resize_ = false;
     ui_->ReloadKeyboardIfNeeded();
   }
 }
 
 void KeyboardController::OnTextInputStateChanged(
     const ui::TextInputClient* client) {
   if (!container_.get())
     return;
 
+  TRACE_EVENT0("vk", "OnTextInputStateChanged");
+
   ui::TextInputType type =
       client ? client->GetTextInputType() : ui::TEXT_INPUT_TYPE_NONE;
 
   if (type == ui::TEXT_INPUT_TYPE_NONE && !keyboard_locked_) {
     if (keyboard_visible_) {
       // Set the visibility state here so that any queries for visibility
       // before the timer fires returns the correct future value.
       keyboard_visible_ = false;
       base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
           FROM_HERE,
@@ skipping 26 matching lines @@
   // Calling |ShowKeyboardInternal| may move the keyboard to another display.
   if (IsKeyboardEnabled() && !keyboard_locked())
     ShowKeyboardInternal(display::kInvalidDisplayId);
 }
 
 void KeyboardController::ShowKeyboardInternal(int64_t display_id) {
   // The container window should have been created already when
   // |Shell::CreateKeyboard| is called.
   DCHECK(container_.get());
 
+  TRACE_EVENT0("vk", "ShowKeyboardInternal");
+
   if (container_->children().empty()) {
     keyboard::MarkKeyboardLoadStarted();
     aura::Window* keyboard = ui_->GetKeyboardWindow();
     keyboard->Show();
     container_->AddChild(keyboard);
     keyboard->set_owned_by_parent(false);
   }
 
   ui_->ReloadKeyboardIfNeeded();
 
@@ skipping 99 matching lines @@
     int keyboard_height = GetContainerWindow()->bounds().height();
     const gfx::Rect& root_bounds = container_->GetRootWindow()->bounds();
     gfx::Rect new_bounds = root_bounds;
     new_bounds.set_y(root_bounds.height() - keyboard_height);
     new_bounds.set_height(keyboard_height);
     GetContainerWindow()->SetBounds(new_bounds);
   }
 }
 
 }  // namespace keyboard