Encapsulate implementation-specific timeline record handling in TimelineUIUtils

Source/devtools/front_end/timeline/TimelineUIUtils.js

Index: Source/devtools/front_end/timeline/TimelineUIUtils.js
diff --git a/Source/devtools/front_end/timeline/TimelineUIUtils.js b/Source/devtools/front_end/timeline/TimelineUIUtils.js
index c5aae0e60da6be2f59b334683c5d5da8d6bcd7d4..750b5470c4c9e3651d628b4fe800a1e08e440c4f 100644
--- a/Source/devtools/front_end/timeline/TimelineUIUtils.js
+++ b/Source/devtools/front_end/timeline/TimelineUIUtils.js
@@ -30,9 +30,53 @@
  */
 
 /**
+ * @constructor
  */
 WebInspector.TimelineUIUtils = function() { }
 
+WebInspector.TimelineUIUtils.prototype = {
+    /**
+     * @param {!WebInspector.TimelineModel.Record} record
+     * @return {boolean}
+     */
+    isBeginFrame: function(record)
+    {
+        throw new Error("Not implemented.");
+    },
+    /**
+     * @param {!WebInspector.TimelineModel.Record} record
+     * @return {boolean}
+     */
+    isProgram: function(record)
+    {
+        throw new Error("Not implemented.");
+    },
+    /**
+     * @param {string} recordType
+     * @return {boolean}
+     */
+    isCoalescable: function(recordType)
+    {
+        throw new Error("Not implemented.");
+    },
+    /**
+     * @param {!WebInspector.TimelineModel.Record} record
+     * @return {?Object}
+     */
+    countersForRecord: function(record)
+    {
+        throw new Error("Not implemented.");
+    },
+    /**
+     * @param {!WebInspector.TimelineModel.Record} record
+     * @return {?Object}
+     */
+    highlightQuadForRecord: function(record)
+    {
+        throw new Error("Not implemented.");
+    }
+}
+
 /**
  * @return {!Object.<string, !WebInspector.TimelineCategory>}
  */
@@ -111,13 +155,6 @@ WebInspector.TimelineUIUtils._initRecordStyles = function()
     return recordStyles;
 }
 
-WebInspector.TimelineUIUtils.coalescableRecordTypes = {};
-WebInspector.TimelineUIUtils.coalescableRecordTypes[WebInspector.TimelineModel.RecordType.Layout] = 1;
-WebInspector.TimelineUIUtils.coalescableRecordTypes[WebInspector.TimelineModel.RecordType.Paint] = 1;
-WebInspector.TimelineUIUtils.coalescableRecordTypes[WebInspector.TimelineModel.RecordType.Rasterize] = 1;
-WebInspector.TimelineUIUtils.coalescableRecordTypes[WebInspector.TimelineModel.RecordType.DecodeImage] = 1;
-WebInspector.TimelineUIUtils.coalescableRecordTypes[WebInspector.TimelineModel.RecordType.ResizeImage] = 1;
-
 /**
  * @param {!WebInspector.TimelineModel.Record} record
  * @return {!{title: string, category: !WebInspector.TimelineCategory}}