Update Event's timeStamp initialization

Fixes whatwg#855.

dom.bs

@@ -37,6 +37,8 @@ urlPrefix: https://w3c.github.io/hr-time/#; spec: HR-TIME
  type:typedef; urlPrefix: dom-; text: DOMHighResTimeStamp
  type:dfn; text: time origin; url: dfn-time-origin
  type:dfn; text: clock resolution
+ type:dfn; text: current high resolution time; url: dfn-current-high-resolution-time
+ type:dfn; text: relative high resolution coarse time; url: dfn-relative-high-resolution-coarse-time
 </pre>
 
 <pre class=link-defaults>
@@ -905,13 +907,9 @@ correct defaults.</p>
 
  <li><p>Set <var>event</var>'s <a>initialized flag</a>.
 
- <li>
-  <p>Initialize <var>event</var>'s {{Event/timeStamp}} attribute to a {{DOMHighResTimeStamp}}
-  representing the high resolution time from the <a>time origin</a> to <var>time</var>.
-
-  <p class=warning>User agents should set a minimum resolution of <var>event</var>'s
-  {{Event/timeStamp}} attribute to 5 microseconds following the existing <a>clock resolution</a>
-  recommendation. [[!HR-TIME]]
+ <li><p>Initialize <var>event</var>'s {{Event/timeStamp}} attribute to the
+ <a>relative high resolution coarse time</a> given <var>time</var> and <var>event</var>'s
+ <a>relevant global object</a>.
 
  <li><p><a for=map>For each</a> <var>member</var> → <var>value</var> in <var>dictionary</var>, if
  <var>event</var> has an attribute whose <a spec=webidl>identifier</a> is <var>member</var>, then
@@ -5404,8 +5402,8 @@ are:
 
  <li><p>Initialize <var>event</var>'s {{Event/type}} attribute to the empty string.
 
- <li><p>Initialize <var>event</var>'s {{Event/timeStamp}} attribute to a {{DOMHighResTimeStamp}}
- representing the high resolution time from the <a>time origin</a> to now.
+ <li><p>Initialize <var>event</var>'s {{Event/timeStamp}} attribute to the result of calling
+ <a>current high resolution time</a> with <a>this</a>'s <a>relevant global object</a>.
 
  <li><p>Initialize <var>event</var>'s {{Event/isTrusted}} attribute to false.
 
@@ -10099,6 +10097,7 @@ Michael™ Smith,
 Mike Champion,
 Mike Taylor,
 Mike West,
+Nicolás Peña Moreno,
 Ojan Vafai,
 Oliver Nightingale,
 Olli Pettay,