Re: [w3c/gamepad] Add algorithms for getGamepads and events (#151)

@nondebug commented on this pull request.



> +      <ol>
+        <li>Let |gamepad:Gamepad| be the {{Gamepad}} instance in |navigator:Navigator|.{{Navigator/[[gamepads]]}} representing the gamepad.
+        <li>Queue a task (where?) to <a>update gamepad state</a> for |gamepad|.
+      </ol>
+      <p>
+        To <dfn>update gamepad state</dfn> for |gamepad|, run the following steps:
+      </p>
+      <ol>
+        <li>Let |now| be the [=current high resolution time=].
+        <li>Set |gamepad|.{{Gamepad/timestamp}} to |now|.
+        <li>Run the steps for <a>map and normalize axes</a> with |gamepad|.
+        <li>Run the steps for <a>map and normalize buttons</a> with |gamepad|.
+        <li>If |navigator|.{{Navigator/[[hasGamepadGesture]]}} is `false` and |gamepad| <a>contains a gamepad user gesture</a>:
+          <ol>
+            <li>Set |navigator|.{{Navigator/[[hasGamepadGesture]]}} to `true`.
+            <li>For each |connectedGamepad:Gamepad| of |navigator|.{{Navigator/[[gamepads]]}}:

Thanks!

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