Extract implementation based on timeline events into TimelineModelImpl

Source/devtools/front_end/timeline/TimelineModelImpl.js

Index: Source/devtools/front_end/timeline/TimelineModelImpl.js
diff --git a/Source/devtools/front_end/timeline/TimelineModel.js b/Source/devtools/front_end/timeline/TimelineModelImpl.js
similarity index 52%
copy from Source/devtools/front_end/timeline/TimelineModel.js
copy to Source/devtools/front_end/timeline/TimelineModelImpl.js
index f913ee67db964d32260343be6cb8cdccd43f0847..7411d5d1aaa7ee565a6559b3598069b62a14070b 100644
--- a/Source/devtools/front_end/timeline/TimelineModel.js
+++ b/Source/devtools/front_end/timeline/TimelineModelImpl.js
@@ -1,43 +1,18 @@
-/*
- * Copyright (C) 2012 Google 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.
- *     * Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following disclaimer
- * in the documentation and/or other materials provided with the
- * distribution.
- *     * Neither the name of Google Inc. nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
+// 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.Object}
+ * @extends {WebInspector.TimelineModel}
  * @param {!WebInspector.TimelineManager} timelineManager
  */
-WebInspector.TimelineModel = function(timelineManager)
+WebInspector.TimelineModelImpl = function(timelineManager)
 {
+    WebInspector.TimelineModel.call(this, timelineManager.target());
     this._timelineManager = timelineManager;
     this._filters = [];
-    this._bindings = new WebInspector.TimelineModel.InterRecordBindings();
+    this._bindings = new WebInspector.TimelineModelImpl.InterRecordBindings();
 
     this.reset();
 
@@ -47,119 +22,9 @@ WebInspector.TimelineModel = function(timelineManager)
     this._timelineManager.addEventListener(WebInspector.TimelineManager.EventTypes.TimelineProgress, this._onProgress, this);
 }
 
-WebInspector.TimelineModel.TransferChunkLengthBytes = 5000000;
-
-WebInspector.TimelineModel.RecordType = {
-    Root: "Root",
-    Program: "Program",
-    EventDispatch: "EventDispatch",
-
-    GPUTask: "GPUTask",
-
-    RequestMainThreadFrame: "RequestMainThreadFrame",
-    BeginFrame: "BeginFrame",
-    ActivateLayerTree: "ActivateLayerTree",
-    DrawFrame: "DrawFrame",
-    ScheduleStyleRecalculation: "ScheduleStyleRecalculation",
-    RecalculateStyles: "RecalculateStyles",
-    InvalidateLayout: "InvalidateLayout",
-    Layout: "Layout",
-    UpdateLayerTree: "UpdateLayerTree",
-    PaintSetup: "PaintSetup",
-    Paint: "Paint",
-    Rasterize: "Rasterize",
-    ScrollLayer: "ScrollLayer",
-    DecodeImage: "DecodeImage",
-    ResizeImage: "ResizeImage",
-    CompositeLayers: "CompositeLayers",
-
-    ParseHTML: "ParseHTML",
-
-    TimerInstall: "TimerInstall",
-    TimerRemove: "TimerRemove",
-    TimerFire: "TimerFire",
-
-    XHRReadyStateChange: "XHRReadyStateChange",
-    XHRLoad: "XHRLoad",
-    EvaluateScript: "EvaluateScript",
-
-    MarkLoad: "MarkLoad",
-    MarkDOMContent: "MarkDOMContent",
-    MarkFirstPaint: "MarkFirstPaint",
-
-    TimeStamp: "TimeStamp",
-    ConsoleTime: "ConsoleTime",
-
-    ResourceSendRequest: "ResourceSendRequest",
-    ResourceReceiveResponse: "ResourceReceiveResponse",
-    ResourceReceivedData: "ResourceReceivedData",
-    ResourceFinish: "ResourceFinish",
-
-    FunctionCall: "FunctionCall",
-    GCEvent: "GCEvent",
-    JSFrame: "JSFrame",
-
-    UpdateCounters: "UpdateCounters",
-
-    RequestAnimationFrame: "RequestAnimationFrame",
-    CancelAnimationFrame: "CancelAnimationFrame",
-    FireAnimationFrame: "FireAnimationFrame",
-
-    WebSocketCreate : "WebSocketCreate",
-    WebSocketSendHandshakeRequest : "WebSocketSendHandshakeRequest",
-    WebSocketReceiveHandshakeResponse : "WebSocketReceiveHandshakeResponse",
-    WebSocketDestroy : "WebSocketDestroy",
-
-    EmbedderCallback : "EmbedderCallback",
-}
-
-WebInspector.TimelineModel.Events = {
-    RecordAdded: "RecordAdded",
-    RecordsCleared: "RecordsCleared",
-    RecordingStarted: "RecordingStarted",
-    RecordingStopped: "RecordingStopped",
-    RecordingProgress: "RecordingProgress",
-    RecordFilterChanged: "RecordFilterChanged"
-}
-
-/**
- * @param {!Array.<!WebInspector.TimelineModel.Record>} recordsArray
- * @param {?function(!WebInspector.TimelineModel.Record)|?function(!WebInspector.TimelineModel.Record,number)} preOrderCallback
- * @param {function(!WebInspector.TimelineModel.Record)|function(!WebInspector.TimelineModel.Record,number)=} postOrderCallback
- * @return {boolean}
- */
-WebInspector.TimelineModel.forAllRecords = function(recordsArray, preOrderCallback, postOrderCallback)
-{
-    /**
-     * @param {!Array.<!WebInspector.TimelineModel.Record>} records
-     * @param {number} depth
-     * @return {boolean}
-     */
-    function processRecords(records, depth)
-    {
-        for (var i = 0; i < records.length; ++i) {
-            var record = records[i];
-            if (preOrderCallback && preOrderCallback(record, depth))
-                return true;
-            if (processRecords(record.children(), depth + 1))
-                return true;
-            if (postOrderCallback && postOrderCallback(record, depth))
-                return true;
-        }
-        return false;
-    }
-    return processRecords(recordsArray, 0);
-}
-
-WebInspector.TimelineModel.prototype = {
-    /**
-     * @return {!WebInspector.Target}
-     */
-    target: function()
-    {
-        return this._timelineManager.target();
-    },
+WebInspector.TimelineModelImpl.TransferChunkLengthBytes = 5000000;
 
+WebInspector.TimelineModelImpl.prototype = {
     /**
      * @return {boolean}
      */
@@ -169,72 +34,6 @@ WebInspector.TimelineModel.prototype = {
     },
 
     /**
-     * @param {?function(!WebInspector.TimelineModel.Record)|?function(!WebInspector.TimelineModel.Record,number)} preOrderCallback
-     * @param {function(!WebInspector.TimelineModel.Record)|function(!WebInspector.TimelineModel.Record,number)=} postOrderCallback
-     */
-    forAllRecords: function(preOrderCallback, postOrderCallback)
-    {
-        WebInspector.TimelineModel.forAllRecords(this._records, preOrderCallback, postOrderCallback);
-    },
-
-    /**
-     * @param {!WebInspector.TimelineModel.Filter} filter
-     */
-    addFilter: function(filter)
-    {
-        this._filters.push(filter);
-        filter._model = this;
-    },
-
-    /**
-     * @param {function(!WebInspector.TimelineModel.Record)|function(!WebInspector.TimelineModel.Record,number)} callback
-     */
-    forAllFilteredRecords: function(callback)
-    {
-        /**
-         * @param {!WebInspector.TimelineModel.Record} record
-         * @param {number} depth
-         * @this {WebInspector.TimelineModel}
-         * @return {boolean}
-         */
-        function processRecord(record, depth)
-        {
-            var visible = this.isVisible(record);
-            if (visible) {
-                if (callback(record, depth))
-                    return true;
-            }
-
-            for (var i = 0; i < record.children().length; ++i) {
-                if (processRecord.call(this, record.children()[i], visible ? depth + 1 : depth))
-                    return true;
-            }
-            return false;
-        }
-
-        for (var i = 0; i < this._records.length; ++i)
-            processRecord.call(this, this._records[i], 0);
-    },
-
-    /**
-     * @param {!WebInspector.TimelineModel.Record} record
-     * @return {boolean}
-     */
-    isVisible: function(record)
-    {
-        for (var i = 0; i < this._filters.length; ++i) {
-            if (!this._filters[i].accept(record))
-                return false;
-        }
-        return true;
-    },
-
-    _filterChanged: function()
-    {
-        this.dispatchEventToListeners(WebInspector.TimelineModel.Events.RecordFilterChanged);
-    },
-
-    /**
      * @param {boolean} captureStacks
      * @param {boolean} captureMemory
      */
@@ -262,7 +61,7 @@ WebInspector.TimelineModel.prototype = {
         /**
          * Console started this one and we are just sniffing it. Initiate recording so that we
          * could stop it.
-         * @this {WebInspector.TimelineModel}
+         * @this {WebInspector.TimelineModelImpl}
          */
         function stopTimeline()
         {
@@ -273,52 +72,6 @@ WebInspector.TimelineModel.prototype = {
         this._timelineManager.stop(this._fireRecordingStopped.bind(this));
     },
 
-    willStartRecordingTraceEvents: function()
-    {
-        this.reset();
-        this._fireRecordingStarted();
-    },
-
-    /**
-     * @param {!Array.<!WebInspector.TracingModel.Event>} mainThreadEvents
-     */
-    didStopRecordingTraceEvents: function(mainThreadEvents)
-    {
-        var recordStack = [];
-        for (var i = 0, size = mainThreadEvents.length; i < size; ++i) {
-            var event = mainThreadEvents[i];
-            while (recordStack.length) {
-                var top = recordStack.peekLast();
-                if (top._event.endTime >= event.startTime)
-                    break;
-                recordStack.pop();
-            }
-            var parentRecord = recordStack.peekLast() || null;
-            var record = new WebInspector.TimelineModel.TraceEventRecord(this, event, parentRecord);
-            if (WebInspector.TimelineUIUtils.isEventDivider(record))
-                this._eventDividerRecords.push(record);
-            if (!recordStack.length)
-                this._addTopLevelRecord(record);
-            if (event.endTime)
-                recordStack.push(record);
-        }
-        this._fireRecordingStopped(null, null);
-    },
-
-    /**
-     * @param {!WebInspector.TimelineModel.TraceEventRecord} record
-     */
-    _addTopLevelRecord: function(record)
-    {
-        this._updateBoundaries(record);
-        this._records.push(record);
-        if (record.type() === WebInspector.TimelineModel.RecordType.Program)
-            this._mainThreadTasks.push(record);
-        if (record.type() === WebInspector.TimelineModel.RecordType.GPUTask)
-            this._gpuThreadTasks.push(record);
-        this.dispatchEventToListeners(WebInspector.TimelineModel.Events.RecordAdded, record);
-    },
-
     /**
      * @return {!Array.<!WebInspector.TimelineModel.Record>}
      */
@@ -459,7 +212,7 @@ WebInspector.TimelineModel.prototype = {
 
     _createFileReader: function(file, delegate)
     {
-        return new WebInspector.ChunkedFileReader(file, WebInspector.TimelineModel.TransferChunkLengthBytes, delegate);
+        return new WebInspector.ChunkedFileReader(file, WebInspector.TimelineModelImpl.TransferChunkLengthBytes, delegate);
     },
 
     _createFileWriter: function()
@@ -475,7 +228,7 @@ WebInspector.TimelineModel.prototype = {
 
         /**
          * @param {boolean} accepted
-         * @this {WebInspector.TimelineModel}
+         * @this {WebInspector.TimelineModelImpl}
          */
         function callback(accepted)
         {
@@ -490,73 +243,10 @@ WebInspector.TimelineModel.prototype = {
     reset: function()
     {
         this._loadedFromFile = false;
-        this._records = [];
         this._payloads = [];
         this._stringPool = {};
-        this._minimumRecordTime = -1;
-        this._maximumRecordTime = -1;
         this._bindings._reset();
-        /** @type {!Array.<!WebInspector.TimelineModel.Record>} */
-        this._mainThreadTasks =  [];
-        /** @type {!Array.<!WebInspector.TimelineModel.Record>} */
-        this._gpuThreadTasks = [];
-        /** @type {!Array.<!WebInspector.TimelineModel.Record>} */
-        this._eventDividerRecords = [];
-        this.dispatchEventToListeners(WebInspector.TimelineModel.Events.RecordsCleared);
-    },
-
-    /**
-     * @return {number}
-     */
-    minimumRecordTime: function()
-    {
-        return this._minimumRecordTime;
-    },
-
-    /**
-     * @return {number}
-     */
-    maximumRecordTime: function()
-    {
-        return this._maximumRecordTime;
-    },
-
-    /**
-     * @param {!WebInspector.TimelineModel.Record} record
-     */
-    _updateBoundaries: function(record)
-    {
-        var startTime = record.startTime();
-        var endTime = record.endTime();
-
-        if (this._minimumRecordTime === -1 || startTime < this._minimumRecordTime)
-            this._minimumRecordTime = startTime;
-        if ((this._maximumRecordTime === -1 && endTime) || endTime > this._maximumRecordTime)
-            this._maximumRecordTime = endTime;
-    },
-
-    /**
-     * @return {!Array.<!WebInspector.TimelineModel.Record>}
-     */
-    mainThreadTasks: function()
-    {
-        return this._mainThreadTasks;
-    },
-
-    /**
-     * @return {!Array.<!WebInspector.TimelineModel.Record>}
-     */
-    gpuThreadTasks: function()
-    {
-        return this._gpuThreadTasks;
-    },
-
-    /**
-     * @return {!Array.<!WebInspector.TimelineModel.Record>}
-     */
-    eventDividerRecords: function()
-    {
-        return this._eventDividerRecords;
+        WebInspector.TimelineModel.prototype.reset.call(this);
     },
 
     /**
@@ -581,18 +271,18 @@ WebInspector.TimelineModel.prototype = {
             this._internStrings(children[i]);
     },
 
-    __proto__: WebInspector.Object.prototype
+    __proto__: WebInspector.TimelineModel.prototype
 }
 
 
 /**
  * @constructor
  */
-WebInspector.TimelineModel.InterRecordBindings = function() {
+WebInspector.TimelineModelImpl.InterRecordBindings = function() {
     this._reset();
 }
 
-WebInspector.TimelineModel.InterRecordBindings.prototype = {
+WebInspector.TimelineModelImpl.InterRecordBindings.prototype = {
     _reset: function()
     {
         this._sendRequestRecords = {};
@@ -605,328 +295,6 @@ WebInspector.TimelineModel.InterRecordBindings.prototype = {
 }
 
 /**
- * @interface
- */
-WebInspector.TimelineModel.Record = function()
-{
-}
-
-WebInspector.TimelineModel.Record.prototype = {
-    /**
-     * @return {?Array.<!ConsoleAgent.CallFrame>}
-     */
-    callSiteStackTrace: function() { },
-
-    /**
-     * @return {?WebInspector.TimelineModel.Record}
-     */
-    initiator: function() { },
-
-    /**
-     * @return {!WebInspector.Target}
-     */
-    target: function() { },
-
-    /**
-     * @return {number}
-     */
-    selfTime: function() { },
-
-    /**
-     * @return {!Array.<!WebInspector.TimelineModel.Record>}
-     */
-    children: function() { },
-
-    /**
-     * @return {!WebInspector.TimelineCategory}
-     */
-    category: function() { },
-
-    /**
-     * @return {string}
-     */
-    title: function() { },
-
-    /**
-     * @return {number}
-     */
-    startTime: function() { },
-
-    /**
-     * @return {string|undefined}
-     */
-    thread: function() { },
-
-    /**
-     * @return {number}
-     */
-    endTime: function() { },
-
-    /**
-     * @param {number} endTime
-     */
-    setEndTime: function(endTime) { },
-
-    /**
-     * @return {!Object}
-     */
-    data: function() { },
-
-    /**
-     * @return {string}
-     */
-    type: function() { },
-
-    /**
-     * @return {string}
-     */
-    frameId: function() { },
-
-    /**
-     * @return {?Array.<!ConsoleAgent.CallFrame>}
-     */
-    stackTrace: function() { },
-
-    /**
-     * @param {string} key
-     * @return {?Object}
-     */
-    getUserObject: function(key) { },
-
-    /**
-     * @param {string} key
-     * @param {?Object|undefined} value
-     */
-    setUserObject: function(key, value) { },
-
-    /**
-     * @return {!Object.<string, number>}
-     */
-    aggregatedStats: function() { },
-
-    /**
-     * @return {?Array.<string>}
-     */
-    warnings: function() { },
-
-    /**
-     * @param {!RegExp} regExp
-     * @return {boolean}
-     */
-    testContentMatching: function(regExp) { }
-}
-
-
-/**
- * @constructor
- * @implements {WebInspector.TimelineModel.Record}
- * @param {!WebInspector.TimelineModel} model
- * @param {!WebInspector.TracingModel.Event} traceEvent
- * @param {?WebInspector.TimelineModel.TraceEventRecord} parentRecord
- */
-WebInspector.TimelineModel.TraceEventRecord = function(model, traceEvent, parentRecord)
-{
-    this._model = model;
-    this._event = traceEvent;
-    traceEvent._timelineRecord = this;
-    if (parentRecord) {
-        this.parent = parentRecord;
-        parentRecord._children.push(this);
-    }
-    this._children = [];
-}
-
-WebInspector.TimelineModel.TraceEventRecord.prototype = {
-    /**
-     * @return {?Array.<!ConsoleAgent.CallFrame>}
-     */
-    callSiteStackTrace: function()
-    {
-        var initiator = this._event.initiator;
-        return initiator ? initiator.stackTrace : null;
-    },
-
-    /**
-     * @return {?WebInspector.TimelineModel.Record}
-     */
-    initiator: function()
-    {
-        var initiator = this._event.initiator;
-        return initiator ? initiator._timelineRecord : null;
-    },
-
-    /**
-     * @return {!WebInspector.Target}
-     */
-    target: function()
-    {
-        return this._model.target();
-    },
-
-    /**
-     * @return {number}
-     */
-    selfTime: function()
-    {
-        return this._event.selfTime / 1000;
-    },
-
-    /**
-     * @return {!Array.<!WebInspector.TimelineModel.Record>}
-     */
-    children: function()
-    {
-        return this._children;
-    },
-
-    /**
-     * @return {!WebInspector.TimelineCategory}
-     */
-    category: function()
-    {
-        var style = WebInspector.TimelineUIUtils.styleForTimelineEvent(this._event.name);
-        return style.category;
-    },
-
-    /**
-     * @return {string}
-     */
-    title: function()
-    {
-        return WebInspector.TimelineUIUtils.recordTitle(this, this._model);
-    },
-
-    /**
-     * @return {number}
-     */
-    startTime: function()
-    {
-        return this._event.startTime / 1000;
-    },
-
-    /**
-     * @return {string|undefined}
-     */
-    thread: function()
-    {
-        return "CPU";
-    },
-
-    /**
-     * @return {number}
-     */
-    endTime: function()
-    {
-        return (this._event.endTime || this._event.startTime) / 1000;
-    },
-
-    /**
-     * @param {number} endTime
-     */
-    setEndTime: function(endTime)
-    {
-        throw new Error("Unsupported operation setEndTime");
-    },
-
-    /**
-     * @return {!Object}
-     */
-    data: function()
-    {
-        return this._event.args.data;
-    },
-
-    /**
-     * @return {string}
-     */
-    type: function()
-    {
-        return this._event.name;
-    },
-
-    /**
-     * @return {string}
-     */
-    frameId: function()
-    {
-        switch (this._event.name) {
-        case WebInspector.TracingTimelineModel.RecordType.ScheduleStyleRecalculation:
-        case WebInspector.TracingTimelineModel.RecordType.RecalculateStyles:
-        case WebInspector.TracingTimelineModel.RecordType.InvalidateLayout:
-            return this._event.args["frameId"];
-        case WebInspector.TracingTimelineModel.RecordType.Layout:
-            return this._event.args["beginData"]["frameId"];
-        default:
-            var data = this._event.args.data;
-            return (data && data["frame"]) || "";
-        }
-    },
-
-    /**
-     * @return {?Array.<!ConsoleAgent.CallFrame>}
-     */
-    stackTrace: function()
-    {
-        return this._event.stackTrace;
-    },
-
-    /**
-     * @param {string} key
-     * @return {?Object}
-     */
-    getUserObject: function(key)
-    {
-        if (key === "TimelineUIUtils::preview-element")
-            return this._event.previewElement;
-        throw new Error("Unexpected key: " + key);
-    },
-
-    /**
-     * @param {string} key
-     * @param {?Object|undefined} value
-     */
-    setUserObject: function(key, value)
-    {
-        if (key !== "TimelineUIUtils::preview-element")
-            throw new Error("Unexpected key: " + key);
-        this._event.previewElement = /** @type {?Element} */ (value);
-    },
-
-    /**
-     * @return {!Object.<string, number>}
-     */
-    aggregatedStats: function()
-    {
-        return {};
-    },
-
-    /**
-     * @return {?Array.<string>}
-     */
-    warnings: function()
-    {
-        if (this._event.warning)
-            return [this._event.warning];
-        return null;
-    },
-
-    /**
-     * @param {!RegExp} regExp
-     * @return {boolean}
-     */
-    testContentMatching: function(regExp)
-    {
-        var tokens = [this.title()];
-        var data = this._event.args.data;
-        if (data) {
-            for (var key in data)
-                tokens.push(data[key]);
-        }
-        return regExp.test(tokens.join("|"));
-    }
-}
-
-/**
  * @constructor
  * @implements {WebInspector.TimelineModel.Record}
  * @param {!WebInspector.TimelineModel} model
@@ -1210,31 +578,6 @@ WebInspector.TimelineModel.RecordImpl.prototype = {
 
 /**
  * @constructor
- */
-WebInspector.TimelineModel.Filter = function()
-{
-    /** @type {!WebInspector.TimelineModel} */
-    this._model;
-}
-
-WebInspector.TimelineModel.Filter.prototype = {
-    /**
-     * @param {!WebInspector.TimelineModel.Record} record
-     * @return {boolean}
-     */
-    accept: function(record)
-    {
-        return true;
-    },
-
-    notifyFilterChanged: function()
-    {
-        this._model._filterChanged();
-    }
-}
-
-/**
- * @constructor
  * @implements {WebInspector.OutputStream}
  * @param {!WebInspector.TimelineModel} model
  * @param {!{cancel: function()}} reader
@@ -1409,7 +752,7 @@ WebInspector.TimelineSaver.prototype = {
         while (this._recordIndex < this._payloads.length) {
             var item = JSON.stringify(this._payloads[this._recordIndex]);
             var itemLength = item.length + separator.length;
-            if (length + itemLength > WebInspector.TimelineModel.TransferChunkLengthBytes)
+            if (length + itemLength > WebInspector.TimelineModelImpl.TransferChunkLengthBytes)
                 break;
             length += itemLength;
             data.push(item);
@@ -1420,41 +763,3 @@ WebInspector.TimelineSaver.prototype = {
         stream.write(data.join(separator), this._writeNextChunk.bind(this));
     }
 }
-
-/**
- * @constructor
- */
-WebInspector.TimelineMergingRecordBuffer = function()
-{
-    this._backgroundRecordsBuffer = [];
-}
-
-/**
- * @constructor
- */
-WebInspector.TimelineMergingRecordBuffer.prototype = {
-    /**
-     * @param {string} thread
-     * @param {!Array.<!WebInspector.TimelineModel.Record>} records
-     * @return {!Array.<!WebInspector.TimelineModel.Record>}
-     */
-    process: function(thread, records)
-    {
-        if (thread) {
-            this._backgroundRecordsBuffer = this._backgroundRecordsBuffer.concat(records);
-            return [];
-        }
-        /**
-         * @param {!WebInspector.TimelineModel.Record} a
-         * @param {!WebInspector.TimelineModel.Record} b
-         */
-        function recordTimestampComparator(a, b)
-        {
-            // Never return 0, as the merge function will squash identical entries.
-            return a.startTime() < b.startTime() ? -1 : 1;
-        }
-        var result = this._backgroundRecordsBuffer.mergeOrdered(records, recordTimestampComparator);
-        this._backgroundRecordsBuffer = [];
-        return result;
-    }
-}