DevTools: expose initial priority of a resource request in Network.requestWillBeSent

Source/devtools/front_end/sdk/NetworkRequest.js

Index: Source/devtools/front_end/sdk/NetworkRequest.js
diff --git a/Source/devtools/front_end/sdk/NetworkRequest.js b/Source/devtools/front_end/sdk/NetworkRequest.js
index e59c14fc2a92043dc6e59aed6b41558bd7135a79..ab52b6af9c9213458e39d5a9c5b7abb166c0320c 100644
--- a/Source/devtools/front_end/sdk/NetworkRequest.js
+++ b/Source/devtools/front_end/sdk/NetworkRequest.js
@@ -61,6 +61,9 @@ WebInspector.NetworkRequest = function(target, requestId, url, documentURL, fram
     this.requestTime = 0;
     this.protocol = "";
 
+    /** @type {?NetworkAgent.ResourcePriority} */
+    this._initialPriority = null;
+
     /** @type {!WebInspector.ResourceType} */
     this._resourceType = WebInspector.resourceTypes.Other;
     this._contentEncoded = false;
@@ -935,6 +938,22 @@ WebInspector.NetworkRequest.prototype = {
     },
 
     /**
+     * @param {!NetworkAgent.ResourcePriority} priority
+     */
+    setInitialPriority: function(priority)
+    {
+        this._initialPriority = priority;
+    },
+
+    /**
+     * @return {?NetworkAgent.ResourcePriority}
+     */
+    initialPriority: function()
+    {
+        return this._initialPriority;
+    },
+
+    /**
      * @param {!Element} image
      */
     populateImageSource: function(image)