Update Gamepad.axes / GamepadButton.value to match the latest specification

Source/modules/gamepad/GamepadCommon.h

Index: Source/modules/gamepad/GamepadCommon.h
diff --git a/Source/modules/gamepad/GamepadCommon.h b/Source/modules/gamepad/GamepadCommon.h
index 95aede44a0232e7d8fd21f1d1775853d3bbc4f7b..9371a6a35680f7e82b580910f4dde33e80f22a05 100644
--- a/Source/modules/gamepad/GamepadCommon.h
+++ b/Source/modules/gamepad/GamepadCommon.h
@@ -36,7 +36,7 @@ class GamepadCommon {
 public:
     GamepadCommon();
     ~GamepadCommon();
-    typedef Vector<float> FloatVector;
+    typedef Vector<double> DoubleVector;
 
     const String& id() const { return m_id; }
     void setId(const String& id) { m_id = id; }
@@ -53,8 +53,8 @@ public:
     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 DoubleVector& axes() const { return m_axes; }
+    void setAxes(unsigned count, const double* data);
 
 protected:
     String m_id;
@@ -62,7 +62,7 @@ protected:
     bool m_connected;
     unsigned long long m_timestamp;
     String m_mapping;
-    FloatVector m_axes;
+    DoubleVector m_axes;
 };
 
 } // namespace WebCore