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

@marcoscaceres commented on this pull request.



> +        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]]}}:
+              <ol>
+                <li>If |connectedGamepad| is not `null`:
+                  <ol>
+                    <li>Set |connectedGamepad|.{{Gamepad/timestamp}} to |now|.
+                    <li>[[=Fire an event=]] named `"gamepadconnected"` at |window:Window| using {{GamepadEvent}} with its {{GamepadEvent/gamepad}} attribute initialized to |connectedGamepad|.

```suggestion
                    <li>[=Fire an event=] named `"gamepadconnected"` at |window:Window| using {{GamepadEvent}} with its {{GamepadEvent/gamepad}} attribute initialized to |connectedGamepad|.
```

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