Encapsulate implementation-specific timeline record handling in TimelineUIUtils

Source/devtools/front_end/timeline/TimelineUIUtilsImpl.js

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+/**
+ * @constructor
+ * @extends {WebInspector.TimelineUIUtils}
+ */
+WebInspector.TimelineUIUtilsImpl = function()
+{
+    WebInspector.TimelineUIUtils.call(this);
+}
+
+WebInspector.TimelineUIUtilsImpl.prototype = {
+    /**
+     * @param {!WebInspector.TimelineModel.Record} record
+     * @return {boolean}
+     */
+    isBeginFrame: function(record)
+    {
+        return record.type() === WebInspector.TimelineModel.RecordType.BeginFrame;
+    },
+    /**
+     * @param {!WebInspector.TimelineModel.Record} record
+     * @return {boolean}
+     */
+    isProgram: function(record)
+    {
+        return record.type() === WebInspector.TimelineModel.RecordType.Program;
+    },
+    /**
+     * @param {string} recordType
+     * @return {boolean}
+     */
+    isCoalescable: function(recordType)
+    {
+        return !!WebInspector.TimelineUIUtilsImpl._coalescableRecordTypes[recordType];
+    },
+
+    /**
+     * @param {!WebInspector.TimelineModel.Record} record
+     * @return {?Object}
+     */
+    countersForRecord: function(record)
+    {
+        return record.type() === WebInspector.TimelineModel.RecordType.UpdateCounters ? record.data() : null;
+    },
+
+    /**
+     * @param {!WebInspector.TimelineModel.Record} record
+     * @return {?Object}
+     */
+    highlightQuadForRecord: function(record)
+    {
+        var recordTypes = WebInspector.TimelineModel.RecordType;
+        switch(record.type()) {
+        case recordTypes.Layout:
+            return record.data().root;
+        case recordTypes.Paint:
+            return record.data().clip;
+        default:
+            return null;
+        }
+    },
+
+    __proto__: WebInspector.TimelineUIUtils.prototype
+}
+
+
+WebInspector.TimelineUIUtilsImpl._coalescableRecordTypes = {};
+WebInspector.TimelineUIUtilsImpl._coalescableRecordTypes[WebInspector.TimelineModel.RecordType.Layout] = 1;
+WebInspector.TimelineUIUtilsImpl._coalescableRecordTypes[WebInspector.TimelineModel.RecordType.Paint] = 1;
+WebInspector.TimelineUIUtilsImpl._coalescableRecordTypes[WebInspector.TimelineModel.RecordType.Rasterize] = 1;
+WebInspector.TimelineUIUtilsImpl._coalescableRecordTypes[WebInspector.TimelineModel.RecordType.DecodeImage] = 1;
+WebInspector.TimelineUIUtilsImpl._coalescableRecordTypes[WebInspector.TimelineModel.RecordType.ResizeImage] = 1;