base: Add blame context

base/BUILD.gn

Index: base/BUILD.gn
diff --git a/base/BUILD.gn b/base/BUILD.gn
index 30380c8edee297e13c594e17acaea7874b96b1ff..11f4ad7debc4e900e298cbf77c67eaa79524e8cb 100644
--- a/base/BUILD.gn
+++ b/base/BUILD.gn
@@ -847,6 +847,7 @@ component("base") {
     "timer/mock_timer.h",
     "timer/timer.cc",
     "timer/timer.h",
+    "trace_event/blame_context.h",
     "trace_event/common/trace_event_common.h",
     "trace_event/heap_profiler_allocation_context.cc",
     "trace_event/heap_profiler_allocation_context.h",
@@ -904,6 +905,8 @@ component("base") {
     "trace_event/trace_log_constants.cc",
     "trace_event/trace_sampling_thread.cc",
     "trace_event/trace_sampling_thread.h",
+    "trace_event/traced_blame_context.cc",
+    "trace_event/traced_blame_context.h",
     "trace_event/tracing_agent.cc",
     "trace_event/tracing_agent.h",
     "trace_event/winheap_dump_provider_win.cc",
@@ -1851,6 +1854,7 @@ test("base_unittests") {
     "trace_event/trace_event_synthetic_delay_unittest.cc",
     "trace_event/trace_event_system_stats_monitor_unittest.cc",
     "trace_event/trace_event_unittest.cc",
+    "trace_event/traced_blame_context_unittest.cc",
     "trace_event/winheap_dump_provider_win_unittest.cc",
     "tracked_objects_unittest.cc",
     "tuple_unittest.cc",