Parametrize TimelinePresentationModel with coalescable record types

Source/devtools/front_end/timeline/TimelineUIUtils.js

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  * Copyright (C) 2012 Intel Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 90 matching lines @@
     recordStyles[recordTypes.WebSocketCreate] = { title: WebInspector.UIString("Create WebSocket"), category: categories["scripting"] };
     recordStyles[recordTypes.WebSocketSendHandshakeRequest] = { title: WebInspector.UIString("Send WebSocket Handshake"), category: categories["scripting"] };
     recordStyles[recordTypes.WebSocketReceiveHandshakeResponse] = { title: WebInspector.UIString("Receive WebSocket Handshake"), category: categories["scripting"] };
     recordStyles[recordTypes.WebSocketDestroy] = { title: WebInspector.UIString("Destroy WebSocket"), category: categories["scripting"] };
     recordStyles[recordTypes.EmbedderCallback] = { title: WebInspector.UIString("Embedder Callback"), category: categories["scripting"] };
 
     WebInspector.TimelineUIUtils._recordStylesMap = recordStyles;
     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}}
  */
 WebInspector.TimelineUIUtils.recordStyle = function(record)
 {
     return WebInspector.TimelineUIUtils.styleForTimelineEvent(record.type());
 }
 
 /**
@@ skipping 873 matching lines @@
         for (var i = 0; i < stackTrace.length; ++i) {
             var stackFrame = stackTrace[i];
             var row = stackTraceElement.createChild("div");
             row.createTextChild(stackFrame.functionName || WebInspector.UIString("(anonymous function)"));
             row.createTextChild(" @ ");
             var urlElement = this._linkifier.linkifyLocation(this._target, stackFrame.url, stackFrame.lineNumber - 1);
             row.appendChild(urlElement);
         }
     }
 }