Use standardized and extendable accelerometer update type.

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 <vector>
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
+#include "chromeos/accelerometer/accelerometer_types.h"
 #include "chromeos/chromeos_export.h"
 #include "ui/gfx/geometry/vector3d_f.h"
 
 namespace base {
 class TaskRunner;
 }
 
 namespace chromeos {
 
 // Reads an accelerometer device and reports data back to an
@@ skipping 11 matching lines @@
 
     // Index of each accelerometer axis in data stream.
     std::vector<unsigned int> index;
   };
   typedef base::RefCountedData<ConfigurationData> Configuration;
   typedef base::RefCountedData<char[12]> Reading;
 
   // An interface to receive data from the AccelerometerReader.
   class Delegate {
    public:
-    virtual void HandleAccelerometerReading(const gfx::Vector3dF& base,
-                                            const gfx::Vector3dF& lid) = 0;
+    virtual void HandleAccelerometerUpdate(
+        const AccelerometerUpdate& update) = 0;
   };
 
   AccelerometerReader(base::TaskRunner* blocking_task_runner,
                       Delegate* delegate);
   ~AccelerometerReader();
 
  private:
   // Dispatched when initialization is complete. If |success|, |configuration|
   // provides the details of the detected accelerometer.
   void OnInitialized(scoped_refptr<Configuration> configuration, bool success);
 
   // Triggers an asynchronous read from the accelerometer, signalling
   // OnDataRead with the result.
   void TriggerRead();
 
   // If |success|, converts the raw reading to a pair of Vector3dF
   // values 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_;
 
   // A weak pointer to the delegate to send accelerometer readings to.
   Delegate* delegate_;
 
+  // The last seen accelerometer data.
+  AccelerometerUpdate update_;
+
   // The accelerometer configuration.
   scoped_refptr<Configuration> configuration_;
 
   base::WeakPtrFactory<AccelerometerReader> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(AccelerometerReader);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_ACCELEROMETER_ACCELEROMETER_READER_H_