Update Gamepad API to match the latest specification

ppapi/shared_impl/ppb_gamepad_shared.h

 // Copyright (c) 2012 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.
 
 #ifndef PPAPI_SHARED_IMPL_PPB_GAMEPAD_SHARED_H_
 #define PPAPI_SHARED_IMPL_PPB_GAMEPAD_SHARED_H_
 
 #include "base/atomicops.h"
 #include "base/strings/string16.h"
 #include "ppapi/c/ppb_gamepad.h"
 #include "ppapi/shared_impl/ppapi_shared_export.h"
 
 namespace ppapi {
 
 // TODO(brettw) when we remove the non-IPC-based gamepad implementation, this
 // code should all move into the GamepadResource.
 
 #pragma pack(push, 1)
 
 struct WebKitGamepadButton {
   bool pressed;
-  float value;
+  double value;
 };
 
 // This must match the definition of blink::Gamepad. The GamepadHost unit test
 // has some compile asserts to validate this.
 struct WebKitGamepad {
   static const size_t kIdLengthCap = 128;
   static const size_t kMappingLengthCap = 16;
   static const size_t kAxesLengthCap = 16;
   static const size_t kButtonsLengthCap = 32;
 
   // Is there a gamepad connected at this index?
   bool connected;
 
   // Device identifier (based on manufacturer, model, etc.).
   base::char16 id[kIdLengthCap];
 
   // Monotonically increasing value referring to when the data were last
   // updated.
   unsigned long long timestamp;
 
   // Number of valid entries in the axes array.
   unsigned axes_length;
 
   // Normalized values representing axes, in the range [-1..1].
-  float axes[kAxesLengthCap];
+  double axes[kAxesLengthCap];
 
   // Number of valid entries in the buttons array.
   unsigned buttons_length;
 
   // Normalized values representing buttons, in the range [0..1].
   WebKitGamepadButton buttons[kButtonsLengthCap];
 
   // Mapping type (for example "standard")
   base::char16 mapping[kMappingLengthCap];
 };
@@ skipping 20 matching lines @@
 
 #pragma pack(pop)
 
 PPAPI_SHARED_EXPORT void ConvertWebKitGamepadData(
     const WebKitGamepads& webkit_data,
     PP_GamepadsSampleData* output_data);
 
 }  // namespace ppapi
 
 #endif  // PPAPI_SHARED_IMPL_PPB_GAMEPAD_SHARED_H_