Use standardized and extendable accelerometer update type.

ash/accelerometer/accelerometer_observer.h

Index: ash/accelerometer/accelerometer_observer.h
diff --git a/ash/accelerometer/accelerometer_observer.h b/ash/accelerometer/accelerometer_observer.h
index 28ee218dc18c056945d0ff0a707c6fa4c132f9e2..5c5148fc257f06d93a150f2e6cf0f936a09fcb08 100644
--- a/ash/accelerometer/accelerometer_observer.h
+++ b/ash/accelerometer/accelerometer_observer.h
@@ -6,10 +6,7 @@
 #define ASH_ACCELEROMETER_ACCELEROMETER_OBSERVER_H_
 
 #include "ash/ash_export.h"
-
-namespace gfx {
-class Vector3dF;
-}
+#include "chromeos/accelerometer/accelerometer_types.h"
 
 namespace ash {
 
@@ -18,8 +15,8 @@ class ASH_EXPORT AccelerometerObserver {
  public:
   // Invoked when an accelerometer reading has been taken. The |base| and |lid|

[Daniel Erat, 2014/08/28 00:27:06]

nit: update this comment

[flackr, 2014/08/28 01:21:36]

Done.

   // accelerometer readings are in G's.
-  virtual void OnAccelerometerUpdated(const gfx::Vector3dF& base,
-                                      const gfx::Vector3dF& lid) = 0;
+  virtual void OnAccelerometerUpdated(
+      const chromeos::AccelerometerUpdate& update) = 0;
 
  protected:
   virtual ~AccelerometerObserver() {}