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
2 files changed