Update Gamepad API to match the latest specification

Update Gamepad API to match the latest specification:
https://dvcs.w3.org/hg/gamepad/raw-file/default/gamepad.html#widl-Gamepad-axes
https://dvcs.w3.org/hg/gamepad/raw-file/default/gamepad.html#widl-GamepadButton-value

Namely, Gamepad.axes / GamepadButton.value should be of type double, not float.

R=bbudge@chromium.org, jam@chromium.org, scottmg@chromium.org
BUG=344556

Review URL: https://codereview.chromium.org/280713004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@271775 0039d316-1c4b-4281-b951-d872f2087c98

ppapi/shared_impl/ppb_gamepad_shared.cc

@@ -18,16 +18,14 @@ void ConvertWebKitGamepadData(const WebKitGamepads& webkit_data,
     if (webkit_pad.connected) {
       COMPILE_ASSERT(sizeof(output_pad.id) == sizeof(webkit_pad.id),
                      id_size_does_not_match);
-      COMPILE_ASSERT(sizeof(output_pad.axes) == sizeof(webkit_pad.axes),
-                     axes_size_does_not_match);
       memcpy(output_pad.id, webkit_pad.id, sizeof(output_pad.id));
       output_pad.timestamp = webkit_pad.timestamp;
       output_pad.axes_length = webkit_pad.axes_length;
-      memcpy(output_pad.axes, webkit_pad.axes, sizeof(output_pad.axes));
+      for (unsigned j = 0; j < webkit_pad.axes_length; ++j)
+        output_pad.axes[j] = static_cast<float>(webkit_pad.axes[j]);
       output_pad.buttons_length = webkit_pad.buttons_length;
-
       for (unsigned j = 0; j < webkit_pad.buttons_length; ++j)
-        output_pad.buttons[j] = webkit_pad.buttons[j].value;
+        output_pad.buttons[j] = static_cast<float>(webkit_pad.buttons[j].value);
     }
   }
 }

ppapi/shared_impl/ppb_gamepad_shared.h

@@ -9,6 +9,7 @@
 #include "base/strings/string16.h"
 #include "ppapi/c/ppb_gamepad.h"
 #include "ppapi/shared_impl/ppapi_shared_export.h"
+#include "third_party/WebKit/public/platform/WebGamepads.h"
 
 namespace ppapi {
 
@@ -17,9 +18,17 @@ namespace ppapi {
 
 #pragma pack(push, 1)
 
+#if defined(ENABLE_NEW_GAMEPAD_API)
+ typedef double buttonValueType;
+ typedef double axisValueType;
+#else
+ typedef float buttonValueType;
+ typedef float axisValueType;
+#endif
+
 struct WebKitGamepadButton {
   bool pressed;
-  float value;
+  buttonValueType value;
 };
 
 // This must match the definition of blink::Gamepad. The GamepadHost unit test
@@ -44,7 +53,7 @@ struct WebKitGamepad {
   unsigned axes_length;
 
   // Normalized values representing axes, in the range [-1..1].
-  float axes[kAxesLengthCap];
+  axisValueType axes[kAxesLengthCap];
 
   // Number of valid entries in the buttons array.
   unsigned buttons_length;