Added tested and corrected accelerometer support for the following MacBook / MacBook Pro models:

chrome/browser/device_orientation/accelerometer_mac.h

 // Copyright (c) 2010 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.
 //
 // This file is based on the SMSLib library.
 //
 // SMSLib Sudden Motion Sensor Access Library
 // Copyright (c) 2010 Suitable Systems
 // All rights reserved.
 //
@@ skipping 60 matching lines @@
 
   virtual ~AccelerometerMac();
 
  private:
   AccelerometerMac();
   bool Init();
 
   // Extend the sign of an integer of size bytes to a 32-bit one.
   static int ExtendSign(int value, size_t size);
 
+  struct GenericMacbookSensor;
   struct SensorDescriptor;
   struct AxisData;
 
-  // List of supported sensors.
+  // Generic sensor data and list of supported sensors.
+  static const GenericMacbookSensor kGenericSensor;
   static const SensorDescriptor kSupportedSensors[];
 
   // Local sensor if supported, else NULL.
   const SensorDescriptor* sensor_;
 
   // IOKit connection to the local sensor.
   io_connect_t io_connection_;
 
   // Input memory used for sensor I/O.
   std::vector<char> input_record_;
 
   // Output memory used for sensor I/O.
   std::vector<char> output_record_;
 };
 
 }  // namespace device_orientation
 
 #endif  // CHROME_BROWSER_DEVICE_ORIENTATION_ACCELEROMETER_MAC_H_