Add filtering by priority in the Network filter area.

third_party/WebKit/Source/devtools/front_end/network/NetworkDataGridNode.js

Index: third_party/WebKit/Source/devtools/front_end/network/NetworkDataGridNode.js
diff --git a/third_party/WebKit/Source/devtools/front_end/network/NetworkDataGridNode.js b/third_party/WebKit/Source/devtools/front_end/network/NetworkDataGridNode.js
index e62d3fb47c9a37582dc2be94b2989415f41c7d3a..c30bba61b11c9255f308b63c639ca15dac9e7e13 100644
--- a/third_party/WebKit/Source/devtools/front_end/network/NetworkDataGridNode.js
+++ b/third_party/WebKit/Source/devtools/front_end/network/NetworkDataGridNode.js
@@ -162,22 +162,14 @@ Network.NetworkDataGridNode = class extends UI.SortableDataGridNode {
     return (aScore - bScore) || a._request.indentityCompare(b._request);
   }
 
+  // TODO(allada) This function deserves to be in a network-common of some sort.
   /**
    * @param {!Network.NetworkDataGridNode} a
    * @param {!Network.NetworkDataGridNode} b
    * @return {number}
    */
   static InitialPriorityComparator(a, b) {
-    var priorityMap = Network.NetworkDataGridNode._symbolicToNumericPriority;
-    if (!priorityMap) {
-      Network.NetworkDataGridNode._symbolicToNumericPriority = new Map();
-      priorityMap = Network.NetworkDataGridNode._symbolicToNumericPriority;
-      priorityMap.set(Protocol.Network.ResourcePriority.VeryLow, 1);
-      priorityMap.set(Protocol.Network.ResourcePriority.Low, 2);
-      priorityMap.set(Protocol.Network.ResourcePriority.Medium, 3);
-      priorityMap.set(Protocol.Network.ResourcePriority.High, 4);
-      priorityMap.set(Protocol.Network.ResourcePriority.VeryHigh, 5);
-    }
+    var priorityMap = Components.symbolicToNumericMap();
     var aScore = priorityMap.get(a._request.initialPriority()) || 0;

[Oleksii Kadurin, 2016/12/20 21:13:01]

The compiler now complains:
WARNING - actual parameter 1 of Map.prototype.get does not match formal
parameter
found   : (Protocol.Network.ResourcePriority|null)
required: Protocol.Network.ResourcePriority<string>
    var aScore = priorityMap.get(aRequest.initialPriority()) || 0;
                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^

Also it complains at this line:
NetworkDataGridNode.js:435: WARNING - actual parameter 1 of
Components.uiLabelForPriority does not match formal parameter
found   : (Protocol.Network.ResourcePriority|null)
required: Protocol.Network.ResourcePriority<string>
        this._setTextAndTitle(cell,
Components.uiLabelForPriority(this._request.initialPriority()));
                                                                 
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

     var bScore = priorityMap.get(b._request.initialPriority()) || 0;