Factor out GamepadCommon base class from Gamepad and WebKitGamepad

Source/modules/gamepad/Gamepad.h

Index: Source/modules/gamepad/Gamepad.h
diff --git a/Source/modules/gamepad/Gamepad.h b/Source/modules/gamepad/Gamepad.h
index 1787b1f83d5f63f9f51d3b66a44da924078f5a65..23ec13744faa9de26a86dfc5dcb157c81fadad10 100644
--- a/Source/modules/gamepad/Gamepad.h
+++ b/Source/modules/gamepad/Gamepad.h
@@ -29,14 +29,13 @@
 #include "bindings/v8/ScriptWrappable.h"
 #include "heap/Handle.h"
 #include "modules/gamepad/GamepadButton.h"
+#include "modules/gamepad/GamepadCommon.h"
 #include "public/platform/WebGamepad.h"
 #include "wtf/RefCounted.h"
-#include "wtf/Vector.h"
-#include "wtf/text/WTFString.h"
 
 namespace WebCore {
 
-class Gamepad FINAL : public RefCountedWillBeGarbageCollectedFinalized<Gamepad>, public ScriptWrappable {
+class Gamepad FINAL : public RefCountedWillBeGarbageCollectedFinalized<Gamepad>, public GamepadCommon, public ScriptWrappable {
 public:
     static PassRefPtrWillBeRawPtr<Gamepad> create()
     {
@@ -44,26 +43,6 @@ public:
     }
     ~Gamepad();
 
-    typedef Vector<float> FloatVector;
-
-    const String& id() const { return m_id; }
-    void setId(const String& id) { m_id = id; }
-
-    unsigned index() const { return m_index; }
-    void setIndex(unsigned val) { m_index = val; }
-
-    bool connected() const { return m_connected; }
-    void setConnected(bool val) { m_connected = val; }
-
-    unsigned long long timestamp() const { return m_timestamp; }
-    void setTimestamp(unsigned long long val) { m_timestamp = val; }
-
-    const String& mapping() const { return m_mapping; }
-    void setMapping(const String& val) { m_mapping = val; }
-
-    const FloatVector& axes() const { return m_axes; }
-    void setAxes(unsigned count, const float* data);
-
     const GamepadButtonVector& buttons() const { return m_buttons; }
     void setButtons(unsigned count, const blink::WebGamepadButton* data);
 
@@ -71,12 +50,6 @@ public:
 
 private:
     Gamepad();
-    String m_id;
-    unsigned m_index;
-    bool m_connected;
-    unsigned long long m_timestamp;
-    String m_mapping;
-    FloatVector m_axes;
     GamepadButtonVector m_buttons;
 };