Add filtering by priority in the Network filter area.

third_party/WebKit/Source/devtools/front_end/components/NetworkConditionsSelector.js

Index: third_party/WebKit/Source/devtools/front_end/components/NetworkConditionsSelector.js
diff --git a/third_party/WebKit/Source/devtools/front_end/components/NetworkConditionsSelector.js b/third_party/WebKit/Source/devtools/front_end/components/NetworkConditionsSelector.js
index a6ee2c2bf6e7942db2477b92e4d5c9b107130bd8..393c6a5b1a566eb5f1d2066711314ab21736e0c8 100644
--- a/third_party/WebKit/Source/devtools/front_end/components/NetworkConditionsSelector.js
+++ b/third_party/WebKit/Source/devtools/front_end/components/NetworkConditionsSelector.js
@@ -484,20 +484,69 @@ Components.NetworkConditionsActionDelegate = class {
 };
 
 /**
- * @param {?Protocol.Network.ResourcePriority} priority
+ * @param {!Protocol.Network.ResourcePriority} priority
  * @return {string}
  */
 Components.uiLabelForPriority = function(priority) {
-  var labelMap = Components.uiLabelForPriority._priorityToUILabel;
-  if (!labelMap) {
-    labelMap = new Map([
-      [Protocol.Network.ResourcePriority.VeryLow, Common.UIString('Lowest')],
-      [Protocol.Network.ResourcePriority.Low, Common.UIString('Low')],
-      [Protocol.Network.ResourcePriority.Medium, Common.UIString('Medium')],
-      [Protocol.Network.ResourcePriority.High, Common.UIString('High')],
-      [Protocol.Network.ResourcePriority.VeryHigh, Common.UIString('Highest')]
-    ]);
-    Components.uiLabelForPriority._priorityToUILabel = labelMap;
-  }
-  return labelMap.get(priority) || Common.UIString('Unknown');
+  var map = Components.priorityUiLabelMap();
+  return map.get(priority) || '';
+};
+
+/**
+ * @param {string} priorityLabel
+ * @return {string}
+ */
+Components.uiLabelToPriority = function(priorityLabel) {
+  /** @type {!Map<string, !Protocol.Network.ResourcePriority>} */
+  var labelToPriorityMap = Components.uiLabelToPriority._uiLabelToPriorityMap;
+
+  if (labelToPriorityMap)
+    return labelToPriorityMap.get(priorityLabel);
+
+  labelToPriorityMap = new Map();
+  Components.priorityUiLabelMap().forEach((value, key) => labelToPriorityMap.set(value, key));
+  Components.uiLabelToPriority._uiLabelToPriorityMap = labelToPriorityMap;
+  return labelToPriorityMap.get(priorityLabel) || '';
+};
+
+/**
+ * @return {!Map<!Protocol.Network.ResourcePriority, string>}
+ */
+Components.priorityUiLabelMap = function() {
+  /** @type {!Map<!Protocol.Network.ResourcePriority, string>} */
+  var map = Components.priorityUiLabelMap._priorityUiLabelMap;
+
+  if (map)
+    return map;
+
+  map = new Map();
+  map.set(Protocol.Network.ResourcePriority.VeryLow, Common.UIString('Lowest'));
+  map.set(Protocol.Network.ResourcePriority.Low, Common.UIString('Low'));
+  map.set(Protocol.Network.ResourcePriority.Medium, Common.UIString('Medium'));
+  map.set(Protocol.Network.ResourcePriority.High, Common.UIString('High'));
+  map.set(Protocol.Network.ResourcePriority.VeryHigh, Common.UIString('Highest'));
+  Components.priorityUiLabelMap._priorityUiLabelMap = map;
+
+  return map;
+};
+
+/**
+ * @return {!Map<!Protocol.Network.ResourcePriority, number>}
+ */
+Components.prioritySymbolToNumericMap = function() {
+  /** @type {!Map<!Protocol.Network.ResourcePriority, number>} */
+  var priorityMap = Components.prioritySymbolToNumericMap._symbolicToNumericPriorityMap;
+
+  if (priorityMap)
+    return priorityMap;
+
+  priorityMap = new Map();
+  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);
+  Components.prioritySymbolToNumericMap._symbolicToNumericPriorityMap = priorityMap;
+
+  return priorityMap;
 };