Adding key press detection in the browser process.

media/base/user_input_monitor.h

+// 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.
+
+#ifndef MEDIA_BASE_USER_INPUT_MONITOR_H_
+#define MEDIA_BASE_USER_INPUT_MONITOR_H_
+
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
+#include "ui/base/events/event_constants.h"
+#include "ui/base/keycodes/keyboard_codes.h"
+
+struct SkIPoint;
+
+namespace base {
+class SingleThreadTaskRunner;
+}  // namespace base
+
+namespace media {
+
+// Called on the |observer_task_runner|.
+class UserInputObserver {
+ public:
+  // Called when the mouse is moved.
+  virtual void OnMouseMoved(const SkIPoint& position) = 0;
+  // Called when a key is pressed or released.
+  // |event| can only be ui::ET_KEY_PRESSED or ui::ET_KEY_RELEASED.
+  virtual void OnKeyboardEvent(ui::EventType event,
+                               ui::KeyboardCode key_code) = 0;
+
+ protected:
+  virtual ~UserInputObserver() {}
+};
+
+// Monitors and notifies about mouse movements and keyboard events.
+class UserInputMonitor {
+ public:
+  // Bit masks for specifying input events of interest.
+  enum InputEvent {
+    MOUSE_MOVEMENT = 0x1,

[Sergey Ulanov, 2013/08/08 01:25:48]

MOUSE_EVENT (enum name and the other already have Event suffix)

[jiayl, 2013/08/09 23:30:14]

Removed now.

+    KEYBOARD_EVENT = 0x2,
+  };
+
+  virtual ~UserInputMonitor() {}
+
+  // Creates a platform-specific instance of UserInputMonitor.
+  // |input_task_runner| is the task runner for an IO thread.
+  // |ui_task_runner| is the task runner for a UI thread.
+  // |observer_task_runner| is the task runner to run callbacks to the
+  // |observer|.
+  // |input_event_mask| specifies the events the caller is interested to
+  // receive notifications for.
+  // |observer| is the notification receiver and dereferenced on the
+  // |observer_task_runner|.
+  static scoped_ptr<UserInputMonitor> Create(
+      const scoped_refptr<base::SingleThreadTaskRunner>& input_task_runner,
+      const scoped_refptr<base::SingleThreadTaskRunner>& ui_task_runner,
+      const scoped_refptr<base::SingleThreadTaskRunner>& observer_task_runner,
+      uint8 input_event_mask,
+      const base::WeakPtr<UserInputObserver>& observer);
+
+ protected:
+  UserInputMonitor() {}
+};
+
+}  // namespace media
+
+#endif  // MEDIA_BASE_USER_INPUT_MONITOR_H_