Reland of [counters] adding runtime call timers for GC

src/heap/gc-tracer.cc

Index: src/heap/gc-tracer.cc
diff --git a/src/heap/gc-tracer.cc b/src/heap/gc-tracer.cc
index 4d02fdeff57071ef61ec73ca3feb90653ca27eb2..e3828e58efdf6be4404ecd4ce84910d568be3870 100644
--- a/src/heap/gc-tracer.cc
+++ b/src/heap/gc-tracer.cc
@@ -24,6 +24,13 @@
 GCTracer::Scope::Scope(GCTracer* tracer, ScopeId scope)
     : tracer_(tracer), scope_(scope) {
   start_time_ = tracer_->heap_->MonotonicallyIncreasingTimeInMs();
+  // TODO(cbruni): remove once we fully moved to a trace-based system.
+  if (FLAG_runtime_call_stats) {
+    RuntimeCallStats* stats =
+        tracer_->heap_->isolate()->counters()->runtime_call_stats();
+    timer_.Initialize(&stats->GC, stats->current_timer());
+    stats->Enter(&timer_);
+  }
 }
 
 
@@ -31,6 +38,10 @@
   DCHECK(scope_ < NUMBER_OF_SCOPES);  // scope_ is unsigned.
   tracer_->current_.scopes[scope_] +=
       tracer_->heap_->MonotonicallyIncreasingTimeInMs() - start_time_;
+  // TODO(cbruni): remove once we fully moved to a trace-based system.
+  if (FLAG_runtime_call_stats) {
+    tracer_->heap_->isolate()->counters()->runtime_call_stats()->Leave(&timer_);
+  }
 }
 
 
@@ -182,6 +193,13 @@
       start_time, committed_memory);
   heap_->isolate()->counters()->aggregated_memory_heap_used()->AddSample(
       start_time, used_memory);
+  // TODO(cbruni): remove once we fully moved to a trace-based system.
+  if (FLAG_runtime_call_stats) {
+    RuntimeCallStats* stats =
+        heap_->isolate()->counters()->runtime_call_stats();
+    timer_.Initialize(&stats->GC, stats->current_timer());
+    stats->Enter(&timer_);
+  }
 }
 
 
@@ -281,6 +299,10 @@
   longest_incremental_marking_finalization_step_ = 0.0;
   cumulative_incremental_marking_finalization_steps_ = 0;
   cumulative_incremental_marking_finalization_duration_ = 0.0;
+  // TODO(cbruni): remove once we fully moved to a trace-based system.
+  if (FLAG_runtime_call_stats) {
+    heap_->isolate()->counters()->runtime_call_stats()->Leave(&timer_);
+  }
 }