Correcly Report CanEnterMaximizeMode on devices without accelerometers

chromeos/accelerometer/accelerometer_reader.h

 // 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.
 
 #ifndef CHROMEOS_ACCELEROMETER_ACCELEROMETER_READER_H_
 #define CHROMEOS_ACCELEROMETER_ACCELEROMETER_READER_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
@@ skipping 72 matching lines @@
   // message and notifies the |delegate_| with the new readings.
   // Triggers another read from the accelerometer at the current sampling rate.
   void OnDataRead(scoped_refptr<Reading> reading, bool success);
 
   // The task runner to use for blocking tasks.
   scoped_refptr<base::TaskRunner> task_runner_;
 
   // The last seen accelerometer data.
   AccelerometerUpdate update_;
 
+  // True if a valid accelerometer update is available.
+  bool has_update_;
+
   // The accelerometer configuration.
   scoped_refptr<Configuration> configuration_;
 
   ObserverList<Observer, true> observers_;
 
   base::WeakPtrFactory<AccelerometerReader> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(AccelerometerReader);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_ACCELEROMETER_ACCELEROMETER_READER_H_