Add Render Blocking Status to PerformanceResourceTiming (#327)

* Add Render Blocking Status to PerformanceResourceTiming

* Change render blocking status to enum

* Change 'render blocking' to render-blocking

* Update getter steps to use timing info

* Fix up getter steps

index.html

@@ -380,6 +380,7 @@ <h3>
               readonly attribute unsigned long long  transferSize;
               readonly attribute unsigned long long  encodedBodySize;
               readonly attribute unsigned long long  decodedBodySize;
+              readonly attribute RenderBlockingStatusType renderBlockingStatus;
               [Default] object toJSON();
           };
         </pre>
@@ -409,6 +410,11 @@ <h3>
           info=] <a data-dfn-for="PerformanceResourceTiming"><dfn>resource
           info</dfn></a>.
         </p>
+        <p>
+          A <a>PerformanceResourceTiming</a> has an associated
+          {{RenderBlockingStatusType}} <a data-dfn-for=
+          "PerformanceResourceTiming"><dfn>render-blocking status</dfn></a>.
+        </p>
         <p>
           The <a>PerformanceResourceTiming</a> interface participates in the
           <a data-cite=
@@ -698,12 +704,47 @@ <h3>
             </p>
           </li>
         </ol>
+        <p data-dfn-for="PerformanceResourceTiming">
+          The <dfn>renderBlockingStatus</dfn> getter steps are to return
+          <a data-link-for="RenderBlockingStatusType">blocking</a>
+          if <a>this</a>'s <a data-for="PerformanceResourceTiming">timing
+          info</a>'s [=fetch timing info/render-blocking=] is true; otherwise
+          <a data-link-for="RenderBlockingStatusType">non-blocking</a>.
+        </p>
         <p class='note'>
           A user agent implementing <a>PerformanceResourceTiming</a> would need
           to include <code>"resource"</code> in
           {{PerformanceObserver/supportedEntryTypes}}. This allows developers
           to detect support for Resource Timing.
         </p>
+        <section id="sec-render-blocking-status-types">
+          <h4>
+            <dfn>RenderBlockingStatusType</dfn> enum
+          </h4>
+          <pre class='idl'>
+            enum RenderBlockingStatusType {
+                "blocking",
+                "non-blocking"
+            };
+          </pre>
+          <p>
+            The values are defined as follows:
+          </p>
+          <dl data-dfn-for='RenderBlockingStatusType'>
+            <dt>
+              <dfn>blocking</dfn>
+            </dt>
+            <dd>
+              The resource can potentially block rendering.
+            </dd>
+            <dt>
+              <dfn>non-blocking</dfn>
+            </dt>
+            <dd>
+              The resource will not block rendering.
+            </dd>
+          </dl>
+        </section>
       </section>
       <section id="sec-extensions-performance-interface" data-dfn-for=
       "Performance">