[gc] Add runtime timer for gc prologue and epilogue callbacks

BUG=

Review-Url: https://codereview.chromium.org/2524733007
Cr-Commit-Position: refs/heads/master@{#41233}

src/counters.h

@@ -708,6 +708,9 @@ class RuntimeCallTimer {
   V(DeoptimizeCode)                                 \
   V(FunctionCallback)                               \
   V(GC)                                             \
+  V(GC_AllAvailableGarbage)                         \
+  V(GCEpilogueCallback)                             \
+  V(GCPrologueCallback)                             \
   V(GenericNamedPropertyDefinerCallback)            \
   V(GenericNamedPropertyDeleterCallback)            \
   V(GenericNamedPropertyDescriptorCallback)         \

src/heap/heap.cc

@@ -855,6 +855,7 @@ void Heap::CollectAllAvailableGarbage(GarbageCollectionReason gc_reason) {
   // Note: as weak callbacks can execute arbitrary code, we cannot
   // hope that eventually there will be no weak callbacks invocations.
   // Therefore stop recollecting after several attempts.
+  RuntimeCallTimerScope(isolate(), &RuntimeCallStats::GC_AllAvailableGarbage);
   if (isolate()->concurrent_recompilation_enabled()) {
     // The optimizing compiler may be unnecessarily holding on to memory.
     DisallowHeapAllocation no_recursive_gc;
@@ -936,6 +937,7 @@ bool Heap::CollectGarbage(GarbageCollector collector,
                           const v8::GCCallbackFlags gc_callback_flags) {
   // The VM is in the GC state until exiting this function.
   VMState<GC> state(isolate_);
+  RuntimeCallTimerScope(isolate(), &RuntimeCallStats::GC);
 
 #ifdef DEBUG
   // Reset the allocation timeout to the GC interval, but make sure to
@@ -1386,6 +1388,7 @@ bool Heap::PerformGarbageCollection(
 
 
 void Heap::CallGCPrologueCallbacks(GCType gc_type, GCCallbackFlags flags) {
+  RuntimeCallTimerScope(isolate(), &RuntimeCallStats::GCPrologueCallback);
   for (int i = 0; i < gc_prologue_callbacks_.length(); ++i) {
     if (gc_type & gc_prologue_callbacks_[i].gc_type) {
       if (!gc_prologue_callbacks_[i].pass_isolate) {
@@ -1407,6 +1410,7 @@ void Heap::CallGCPrologueCallbacks(GCType gc_type, GCCallbackFlags flags) {
 
 void Heap::CallGCEpilogueCallbacks(GCType gc_type,
                                    GCCallbackFlags gc_callback_flags) {
+  RuntimeCallTimerScope(isolate(), &RuntimeCallStats::GCEpilogueCallback);
   for (int i = 0; i < gc_epilogue_callbacks_.length(); ++i) {
     if (gc_type & gc_epilogue_callbacks_[i].gc_type) {
       if (!gc_epilogue_callbacks_[i].pass_isolate) {