1 files changed, 46 insertions, 0 deletions
diff --git a/chrome/browser/chromeos/camera_detector.h b/chrome/browser/chromeos/camera_detector.h
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+++ b/chrome/browser/chromeos/camera_detector.h
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+// Copyright (c) 2011 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 CHROME_BROWSER_CHROMEOS_CAMERA_DETECTOR_H_
+#define CHROME_BROWSER_CHROMEOS_CAMERA_DETECTOR_H_
+
+#include "base/callback.h"
+
+namespace chromeos {
+
+// Class used to check for camera presence.
+class CameraDetector {
+ public:
+  enum CameraPresence {
+    kCameraPresenceUnknown = 0,
+    kCameraAbsent,
+    kCameraPresent
+  };
+
+  // Returns result of the last presence check. If no check has been performed
+  // yet, returns |kCameraPresenceUnknown|.
+  static CameraPresence camera_presence() {
+    return camera_presence_;
+  }
+
+  // Checks asynchronously for camera device presence. Only one
+  // presence check can be running at a time. Calls |check_done|
+  // on current thread when the check has been completed.
+  static void StartPresenceCheck(const base::Closure& check_done);
+
+ private:
+  // Checks for camera presence. Runs on a worker pool.
+  static void CheckPresence();
+
+  // Result of the last presence check.
+  static CameraPresence camera_presence_;
+
+  static bool presence_check_in_progress_;
+
+  DISALLOW_COPY_AND_ASSIGN(CameraDetector);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_CAMERA_DETECTOR_H_