Adds WmShell::RecordTaskSwitchMetric()

ash/common/wm_shell.h

 // Copyright 2016 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.
 
 #ifndef ASH_COMMON_WM_SHELL_H_
 #define ASH_COMMON_WM_SHELL_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 23 matching lines @@
 class ShellDelegate;
 class ShellObserver;
 class SystemTrayDelegate;
 class SystemTrayNotifier;
 class WindowResizer;
 class WindowSelectorController;
 class WmActivationObserver;
 class WmDisplayObserver;
 class WmWindow;
 
+enum class TaskSwitchSource;

[James Cook, 2016/07/18 22:27:10]

I love enum class.

+
 namespace wm {
 class MaximizeModeEventHandler;
 class WindowState;
 }
 
 #if defined(OS_CHROMEOS)
 class LogoutConfirmationController;
 #endif
 
 // Similar to ash::Shell. Eventually the two will be merged.
@@ skipping 102 matching lines @@
   // TODO(jamescook): Remove this when ShellDelegate has been moved.
   virtual bool CanShowWindowForUser(WmWindow* window) = 0;
 
   // See aura::client::CursorClient for details on these.
   virtual void LockCursor() = 0;
   virtual void UnlockCursor() = 0;
 
   virtual std::vector<WmWindow*> GetAllRootWindows() = 0;
 
   virtual void RecordUserMetricsAction(UserMetricsAction action) = 0;
+  virtual void RecordTaskSwitchMetric(TaskSwitchSource source) = 0;
 
   // Returns a WindowResizer to handle dragging. |next_window_resizer| is
   // the next WindowResizer in the WindowResizer chain. This may return
   // |next_window_resizer|.
   virtual std::unique_ptr<WindowResizer> CreateDragWindowResizer(
       std::unique_ptr<WindowResizer> next_window_resizer,
       wm::WindowState* window_state) = 0;
 
   virtual std::unique_ptr<wm::MaximizeModeEventHandler>
   CreateMaximizeModeEventHandler() = 0;
@@ skipping 94 matching lines @@
   bool simulate_modal_window_open_for_testing_ = false;
 
 #if defined(OS_CHROMEOS)
   std::unique_ptr<LogoutConfirmationController> logout_confirmation_controller_;
 #endif
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_WM_SHELL_H_