Introduce base classes for blame contexts

tracing/trace_viewer.gypi

 # Copyright (c) 2015 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.
 
 {
   'variables': {
     'tracing_css_files': [
       'tracing/ui/base/line_chart.css',
       'tracing/ui/base/list_view.css',
       'tracing/ui/base/pie_chart.css',
@@ skipping 47 matching lines @@
       'tracing/base/sorted_array_utils.html',
       'tracing/base/statistics.html',
       'tracing/base/task.html',
       'tracing/base/timing.html',
       'tracing/base/utils.html',
       'tracing/core/auditor.html',
       'tracing/core/filter.html',
       'tracing/core/scripting_controller.html',
       'tracing/core/scripting_object.html',
       'tracing/extras/android/android_auditor.html',
+      'tracing/extras/chrome/blame_context/blame_context.html',
+      'tracing/extras/chrome/blame_context/frame_tree_node.html',
+      'tracing/extras/chrome/blame_context/render_frame.html',
+      'tracing/extras/chrome/blame_context/top_level.html',
       'tracing/extras/chrome/cc/cc.html',
       'tracing/extras/chrome/cc/constants.html',
       'tracing/extras/chrome/cc/debug_colors.html',
       'tracing/extras/chrome/cc/display_item_list.html',
       'tracing/extras/chrome/cc/input_latency_async_slice.html',
       'tracing/extras/chrome/cc/layer_impl.html',
       'tracing/extras/chrome/cc/layer_tree_host_impl.html',
       'tracing/extras/chrome/cc/layer_tree_impl.html',
       'tracing/extras/chrome/cc/picture.html',
       'tracing/extras/chrome/cc/picture_as_image_data.html',
       'tracing/extras/chrome/cc/raster_task.html',
       'tracing/extras/chrome/cc/region.html',
       'tracing/extras/chrome/cc/render_pass.html',
       'tracing/extras/chrome/cc/tile.html',
       'tracing/extras/chrome/cc/tile_coverage_rect.html',
       'tracing/extras/chrome/cc/util.html',
       'tracing/extras/chrome/chrome_auditor.html',
       'tracing/extras/chrome/chrome_user_friendly_category_driver.html',
-      'tracing/extras/chrome/frame_tree_node.html',
       'tracing/extras/chrome/gpu/gpu_async_slice.html',
       'tracing/extras/chrome/gpu/state.html',
       'tracing/extras/chrome/layout_object.html',
       'tracing/extras/chrome/layout_tree.html',
-      'tracing/extras/chrome/render_frame.html',
       'tracing/extras/chrome_config.html',
       'tracing/extras/importer/android/event_log_importer.html',
       'tracing/extras/importer/battor_importer.html',
       'tracing/extras/importer/ddms_importer.html',
       'tracing/extras/importer/etw/etw_importer.html',
       'tracing/extras/importer/etw/eventtrace_parser.html',
       'tracing/extras/importer/etw/parser.html',
       'tracing/extras/importer/etw/process_parser.html',
       'tracing/extras/importer/etw/thread_parser.html',
       'tracing/extras/importer/gcloud_trace/gcloud_trace_importer.html',
@@ skipping 369 matching lines @@
       'tracing/ui/images/chrome-right.png',
       'tracing/ui/images/ui-states.png',
     ],
     'tracing_files': [
       '<@(tracing_css_files)',
       '<@(tracing_js_html_files)',
       '<@(tracing_img_files)',
     ],
   }
 }