DevTools: Extract ChartViewport out of FlameChart.

third_party/WebKit/Source/devtools/BUILD.gn

 # 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.
 
 import("//build/config/features.gni")
 import("//third_party/WebKit/Source/core/core.gni")
 
 devtools_embedder_scripts = [
   "front_end/devtools.js",
   "front_end/Tests.js",
@@ skipping 736 matching lines @@
   "front_end/timeline/TimelineUIUtils.js",
 ]
 devtools_ui_lazy_js_files = [
   "front_end/ui_lazy/dataGrid.css",
   "front_end/ui_lazy/dialog.css",
   "front_end/ui_lazy/filteredListWidget.css",
   "front_end/ui_lazy/flameChart.css",
   "front_end/ui_lazy/overviewGrid.css",
   "front_end/ui_lazy/pieChart.css",
   "front_end/ui_lazy/timelineGrid.css",
+  "front_end/ui_lazy/ChartViewport.js",
   "front_end/ui_lazy/CommandMenu.js",
   "front_end/ui_lazy/DataGrid.js",
   "front_end/ui_lazy/FilteredListWidget.js",
   "front_end/ui_lazy/FlameChart.js",
   "front_end/ui_lazy/OverviewGrid.js",
   "front_end/ui_lazy/PieChart.js",
   "front_end/ui_lazy/ShowMoreDataGridNode.js",
   "front_end/ui_lazy/SortableDataGrid.js",
   "front_end/ui_lazy/TimelineGrid.js",
   "front_end/ui_lazy/TimelineOverviewPane.js",
@@ skipping 379 matching lines @@
     deps = [
       ":frontend_protocol_sources",
       ":supported_css_properties",
     ]
     sources = generated_scripts
     outputs = [
       "$resources_out_debug_dir/{{source_file_part}}",
     ]
   }
 }