Refactors DeviceOrientation to make it more extensible

content/browser/device_orientation/orientation.h

Index: content/browser/device_orientation/orientation.h
diff --git a/content/browser/device_orientation/orientation.h b/content/browser/device_orientation/orientation.h
index f4679b23b7730e39c1911fc0d5aef23765429747..78ad79065d90eb10d344acb85e9c6664c578e3d6 100644
--- a/content/browser/device_orientation/orientation.h
+++ b/content/browser/device_orientation/orientation.h
@@ -5,8 +5,11 @@
 #ifndef CONTENT_BROWSER_DEVICE_ORIENTATION_ORIENTATION_H_
 #define CONTENT_BROWSER_DEVICE_ORIENTATION_ORIENTATION_H_
 
+#include "base/compiler_specific.h"
+#include "content/browser/device_orientation/device_data.h"
+
 namespace device_orientation {
-class Orientation {
+  class Orientation : public DeviceData {
  public:
   // alpha, beta, gamma and absolute are the rotations around the axes as
   // specified in http://dev.w3.org/geo/api/spec-source-orientation.html
@@ -19,34 +22,14 @@ class Orientation {
         can_provide_beta_(false),
         can_provide_gamma_(false),
         can_provide_absolute_(false) {
-  }
-  Orientation(const Orientation& orientation)
-      : alpha_(orientation.alpha()),
-        beta_(orientation.beta()),
-        gamma_(orientation.gamma()),
-        absolute_(orientation.absolute()),
-        can_provide_alpha_(orientation.can_provide_alpha()),
-        can_provide_beta_(orientation.can_provide_beta()),
-        can_provide_gamma_(orientation.can_provide_gamma()),
-        can_provide_absolute_(orientation.can_provide_absolute()) {
-  }
-  void operator=(const Orientation& source) {
-    alpha_ = source.alpha();
-    beta_ = source.beta();
-    gamma_ = source.gamma();
-    absolute_ = source.absolute();
-    can_provide_alpha_ = source.can_provide_alpha();
-    can_provide_beta_ = source.can_provide_beta();
-    can_provide_gamma_ = source.can_provide_gamma();
-    can_provide_absolute_ = source.can_provide_absolute();
+    device_data_type_ = DeviceData::kDeviceOrientationData;
   }
 
   static Orientation Empty() { return Orientation(); }
 
-  bool is_empty() const {
-    return !can_provide_alpha_ && !can_provide_beta_ && !can_provide_gamma_
-        && !can_provide_absolute_;
-  }
+  virtual DeviceData* Clone() const OVERRIDE;
+  virtual bool IsEmpty() const OVERRIDE;
+  virtual bool SignificantlyDifferentFrom(const DeviceData& other) OVERRIDE;
 
   void set_alpha(double alpha) {
     can_provide_alpha_ = true;