Add pixelRatio.

Author: Guido Urdaneta

index.html

@@ -150,7 +150,6 @@ <h2>Terminology</h2>
     <p>The <dfn class="export">source pixel ratio</dfn> of a <a>display
     surface</a> is 1/96th of 1 inch divided by its vertical pixel size.</p>
 
-
     <p>The <dfn class="event">devicechange</dfn> event is defined in
     [[GETUSERMEDIA]].</p>
   </section>
@@ -879,6 +878,21 @@ <h2 id="constrainable-properties">Constrainable Properties for Captured
             {{CursorCaptureConstraint}} it is capable of supporting for this
             [=display surface=].</td>
           </tr>
+
+          <tr id="def-constraint-pixel-ratio">
+            <td><dfn class="export">pixelRatio</dfn>
+            </td>
+
+            <td>{{double}}</td>
+
+            <td>As a setting, indicates the pixel ratio of the [=display surface=].
+            For [= display surface/browser =] surfaces, it is equivalent to the
+            surface's {{Window/devicePixelRatio}}. For [= display surface/window =]
+            and [= display surface/monitor =]surfaces,  it is equivalent to the
+            [=display surface=]'s scale factor.
+            It cannot be used as a constraint or capability.
+            </td>
+          </tr>
         </tbody>
       </table>
 
@@ -1872,6 +1886,7 @@ <h2>Extensions to {{MediaTrackSettings}}</h2>
   DOMString cursor;
   boolean restrictOwnAudio;
   boolean suppressLocalAudioPlayback;
+  double pixelRatio;
 };</pre>
 
         <dl data-link-for="MediaTrackSettings" data-dfn-for=
@@ -1924,6 +1939,14 @@ <h2>Extensions to {{MediaTrackSettings}}</h2>
             agent to apply [=local audio playback suppression=] to the
             source.</p>
           </dd>
+
+
+          <dt><dfn>pixelRatio</dfn> of type {{double}}</dt>
+
+
+          <dd>
+            <p>The pixel ratio of of the [=display surface=] being captured.</p>
+          </dd>
         </dl>
       </section>
 

screenshare.js

@@ -59,7 +59,7 @@ var respecConfig = {
 
   // name of the WG
   group: "webrtc",
-  xref: ["html", "infra", "permissions", "permissions-policy", "dom", "mediacapture-streams", "webidl"],
+  xref: ["html", "infra", "permissions", "permissions-policy", "dom", "mediacapture-streams", "webidl", "cssom-view"],
   // name (without the @w3.org) of the public mailing to which comments are due
   wgPublicList: "public-webrtc",