Refactor histogram-set-view to an MVC pattern.

tracing/trace_viewer.gypi

Index: tracing/trace_viewer.gypi
diff --git a/tracing/trace_viewer.gypi b/tracing/trace_viewer.gypi
index 863bf3a70e2f8d3445c2930a850f34851fe2f17f..28f05eacc47c4966e74d198d18d7e17907154a23 100644
--- a/tracing/trace_viewer.gypi
+++ b/tracing/trace_viewer.gypi
@@ -58,6 +58,7 @@
       'tracing/base/multi_dimensional_view.html',
       'tracing/base/raf.html',
       'tracing/base/scalar.html',
+      'tracing/base/serializable.html',
       'tracing/base/settings.html',
       'tracing/base/sinebow_color_generator.html',
       'tracing/base/task.html',
@@ -66,6 +67,7 @@
       'tracing/base/unit.html',
       'tracing/base/unit_scale.html',
       'tracing/base/utils.html',
+      'tracing/base/view_state.html',
       'tracing/core/auditor.html',
       'tracing/core/filter.html',
       'tracing/core/scripting_controller.html',
@@ -537,7 +539,9 @@
       'tracing/value/diagnostics/telemetry_info.html',
       'tracing/value/diagnostics/unmergeable_diagnostic_set.html',
       'tracing/value/histogram.html',
+      'tracing/value/histogram_parameter_collector.html',
       'tracing/value/histogram_set.html',
+      'tracing/value/histogram_set_hierarchy.html',
       'tracing/value/ui/breakdown_span.html',
       'tracing/value/ui/buildbot_info_span.html',
       'tracing/value/ui/collected_related_event_set_span.html',
@@ -545,11 +549,13 @@
       'tracing/value/ui/diagnostic_map_table.html',
       'tracing/value/ui/diagnostic_span.html',
       'tracing/value/ui/generic_diagnostic_span.html',
+      'tracing/value/ui/histogram_set_controls.html',
       'tracing/value/ui/histogram_set_table.html',
       'tracing/value/ui/histogram_set_table_cell.html',
       'tracing/value/ui/histogram_set_table_name_cell.html',
       'tracing/value/ui/histogram_set_table_row.html',
       'tracing/value/ui/histogram_set_view.html',
+      'tracing/value/ui/histogram_set_view_state.html',
       'tracing/value/ui/histogram_span.html',
       'tracing/value/ui/merged_buildbot_info_span.html',
       'tracing/value/ui/merged_device_info_span.html',