[Tracing] Show background parsing runtime statistics in tracing.

src/parsing/parser.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/parsing/parser.h"
 
 #include <memory>
 
 #include "src/api.h"
 #include "src/ast/ast-expression-rewriter.h"
@@ skipping 3791 matching lines @@
       isolate->CountUsage(v8::Isolate::kHtmlCommentInExternalScript);
     }
   }
   isolate->counters()->total_preparse_skipped()->Increment(
       total_preparse_skipped_);
   if (!parsing_on_main_thread_ &&
       FLAG_runtime_stats ==
           v8::tracing::TracingCategoryObserver::ENABLED_BY_NATIVE) {
     // Copy over the counters from the background thread to the main counters on
     // the isolate.
-    // TODO(cbruni,lpy): properly attach the runtime stats to the trace for
-    // background parsing.
     isolate->counters()->runtime_call_stats()->Add(runtime_call_stats_);
   }
 }
 
 void Parser::ParseOnBackground(ParseInfo* info) {
   parsing_on_main_thread_ = false;
 
   DCHECK(info->literal() == NULL);
   FunctionLiteral* result = NULL;
 
@@ skipping 42 matching lines @@
 
   info->set_literal(result);
 
   // We cannot internalize on a background thread; a foreground task will take
   // care of calling Parser::Internalize just before compilation.
 
   if (produce_cached_parse_data()) {
     if (result != NULL) *info->cached_data() = logger.GetScriptData();
     log_ = NULL;
   }
-  if (FLAG_runtime_stats) {
-    // TODO(cbruni,lpy): properly attach the runtime stats to the trace for
-    // background parsing.
+  if (FLAG_runtime_stats &
+      v8::tracing::TracingCategoryObserver::ENABLED_BY_TRACING) {
+    auto value = v8::tracing::TracedValue::Create();
+    runtime_call_stats_->Dump(value.get());
+    TRACE_EVENT_INSTANT1(TRACE_DISABLED_BY_DEFAULT("v8.runtime_stats"),
+                         "V8.RuntimeStats", TRACE_EVENT_SCOPE_THREAD,
+                         "runtime-call-stats", std::move(value));
   }
 }
 
 Parser::TemplateLiteralState Parser::OpenTemplateLiteral(int pos) {
   return new (zone()) TemplateLiteral(zone(), pos);
 }
 
 
 void Parser::AddTemplateSpan(TemplateLiteralState* state, bool tail) {
   int pos = scanner()->location().beg_pos;
@@ skipping 1556 matching lines @@
 
   return final_loop;
 }
 
 #undef CHECK_OK
 #undef CHECK_OK_VOID
 #undef CHECK_FAILED
 
 }  // namespace internal
 }  // namespace v8