Parametrize TimelinePresentationModel with coalescable record types

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.
 
 /**
  */
 WebInspector.TracingTimelineUIUtils = function() { }
 
 /**
  * @constructor
@@ skipping 62 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;
+
 /**
  * @param {!WebInspector.TracingModel.Event} event
  * @return {!{title: string, category: !WebInspector.TimelineCategory}}
  */
 WebInspector.TracingTimelineUIUtils.eventStyle = function(event)
 {
     return WebInspector.TracingTimelineUIUtils.styleForTraceEvent(event.name);
 }
 
 /**
@@ skipping 442 matching lines @@
             callback();
             return;
         }
         var container = document.createElement("div");
         container.className = "image-preview-container";
         var img = container.createChild("img");
         img.src = encodedBitmap;
         callback(container);
     }
 }