Reland of Timeline: extract and rename TracingModelLoader into a file of its own

third_party/WebKit/Source/devtools/devtools.gypi

 #
 # Copyright (C) 2013 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
@@ skipping 664 matching lines @@
             'front_end/timeline/LayerViewHost.js',
             'front_end/timeline/Layers3DView.js',
             'front_end/timeline/MemoryCountersGraph.js',
             'front_end/timeline/PaintProfilerView.js',
             'front_end/timeline/TimelineEventOverview.js',
             'front_end/timeline/TimelineFlameChart.js',
             'front_end/timeline/TimelineFrameModel.js',
             'front_end/timeline/TimelineIRModel.js',
             'front_end/timeline/TimelineJSProfile.js',
             'front_end/timeline/TimelineLayersView.js',
+            'front_end/timeline/TimelineLoader.js',
             'front_end/timeline/TimelineModel.js',
             'front_end/timeline/TimelinePaintProfilerView.js',
             'front_end/timeline/TimelinePanel.js',
             'front_end/timeline/TimelineTreeView.js',
             'front_end/timeline/TimelineUIUtils.js',
             'front_end/timeline/TransformController.js',
         ],
         'devtools_ui_lazy_js_files': [
             'front_end/ui_lazy/dataGrid.css',
             'front_end/ui_lazy/filteredListWidget.css',
@@ skipping 145 matching lines @@
             'front_end/Images/toolbarItemSelected.png',
             'front_end/Images/touchCursor.png',
             'front_end/Images/touchCursor_2x.png',
             'front_end/Images/updateServiceWorker.svg',
         ],
         'devtools_extension_api_files': [
             'front_end/extensions/ExtensionAPI.js',
         ],
     },
 }