Encapsulate implementation-specific timeline record handling in TimelineUIUtils

Source/devtools/front_end/timeline/TracingTimelineUIUtils.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.TracingTimelineUIUtils = function() { }
+WebInspector.TracingTimelineUIUtils = function()
+{
+    WebInspector.TimelineUIUtils.call(this);
+}
+
+WebInspector.TracingTimelineUIUtils.prototype = {
+    /**
+     * @param {!WebInspector.TimelineModel.Record} record
+     * @return {boolean}
+     */
+    isBeginFrame: function(record)
+    {
+        return record.type() === WebInspector.TracingTimelineModel.RecordType.BeginFrame;
+    },
+
+    /**
+     * @param {!WebInspector.TimelineModel.Record} record
+     * @return {boolean}
+     */
+    isProgram: function(record)
+    {
+        return record.type() === WebInspector.TracingTimelineModel.RecordType.Program;
+    },
+
+    /**
+     * @param {string} recordType
+     * @return {boolean}
+     */
+    isCoalescable: function(recordType)
+    {
+        return !!WebInspector.TracingTimelineUIUtils._coalescableRecordTypes[recordType];
+    },
+
+    /**
+     * @param {!WebInspector.TimelineModel.Record} record
+     * @return {?Object}
+     */
+    countersForRecord: function(record)
+    {
+        return record.type() === WebInspector.TracingTimelineModel.RecordType.UpdateCounters ? record.data() : null;
+    },
+
+    /**
+     * @param {!WebInspector.TimelineModel.Record} record
+     * @return {?Object}
+     */
+    highlightQuadForRecord: function(record)
+    {
+        return record.traceEvent().highlightQuad || null;
+    },
+
+    __proto__: WebInspector.TimelineUIUtils.prototype
+}
 
 /**
  * @constructor
  * @param {string} title
  * @param {!WebInspector.TimelineCategory} category
  */
 WebInspector.TimelineRecordStyle = function(title, category)
 {
     this.title = title;
     this.category = category;
@@ skipping 55 matching lines @@
     eventStyles[recordTypes.WebSocketReceiveHandshakeResponse] = new WebInspector.TimelineRecordStyle(WebInspector.UIString("Receive WebSocket Handshake"), categories["scripting"]);
     eventStyles[recordTypes.WebSocketDestroy] = new WebInspector.TimelineRecordStyle(WebInspector.UIString("Destroy WebSocket"), categories["scripting"]);
     eventStyles[recordTypes.EmbedderCallback] = new WebInspector.TimelineRecordStyle(WebInspector.UIString("Embedder Callback"), categories["scripting"]);
     eventStyles[recordTypes.DecodeImage] = new WebInspector.TimelineRecordStyle(WebInspector.UIString("Image Decode"), categories["painting"]);
     eventStyles[recordTypes.ResizeImage] = new WebInspector.TimelineRecordStyle(WebInspector.UIString("Image Resize"), categories["painting"]);
 
     WebInspector.TracingTimelineUIUtils._eventStylesMap = eventStyles;
     return eventStyles;
 }
 
-WebInspector.TracingTimelineUIUtils.coalescableRecordTypes = {};
-WebInspector.TracingTimelineUIUtils.coalescableRecordTypes[WebInspector.TracingTimelineModel.RecordType.Layout] = 1;
-WebInspector.TracingTimelineUIUtils.coalescableRecordTypes[WebInspector.TracingTimelineModel.RecordType.Paint] = 1;
-WebInspector.TracingTimelineUIUtils.coalescableRecordTypes[WebInspector.TracingTimelineModel.RecordType.Rasterize] = 1;
-WebInspector.TracingTimelineUIUtils.coalescableRecordTypes[WebInspector.TracingTimelineModel.RecordType.DecodeImage] = 1;
-WebInspector.TracingTimelineUIUtils.coalescableRecordTypes[WebInspector.TracingTimelineModel.RecordType.ResizeImage] = 1;
+WebInspector.TracingTimelineUIUtils._coalescableRecordTypes = {};
+WebInspector.TracingTimelineUIUtils._coalescableRecordTypes[WebInspector.TracingTimelineModel.RecordType.Layout] = 1;
+WebInspector.TracingTimelineUIUtils._coalescableRecordTypes[WebInspector.TracingTimelineModel.RecordType.Paint] = 1;
+WebInspector.TracingTimelineUIUtils._coalescableRecordTypes[WebInspector.TracingTimelineModel.RecordType.Rasterize] = 1;
+WebInspector.TracingTimelineUIUtils._coalescableRecordTypes[WebInspector.TracingTimelineModel.RecordType.DecodeImage] = 1;
+WebInspector.TracingTimelineUIUtils._coalescableRecordTypes[WebInspector.TracingTimelineModel.RecordType.ResizeImage] = 1;
 
 /**
  * @param {!WebInspector.TracingModel.Event} event
  * @return {!{title: string, category: !WebInspector.TimelineCategory}}
  */
 WebInspector.TracingTimelineUIUtils.eventStyle = function(event)
 {
     return WebInspector.TracingTimelineUIUtils.styleForTraceEvent(event.name);
 }
 
@@ skipping 443 matching lines @@
             callback();
             return;
         }
         var container = document.createElement("div");
         container.className = "image-preview-container";
         var img = container.createChild("img");
         img.src = encodedBitmap;
         callback(container);
     }
 }