Adds support for collecting statistics about code and its metadata.

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index a4e047c9b64a6b9c66c8618a3376f9a5ba12e540..a9e13f755a03c1b8fa0bedfbda43d6f7fef1d34f 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -5504,6 +5504,8 @@ HeapObjectStatistics::HeapObjectStatistics()
       object_count_(0),
       object_size_(0) {}
 
+HeapCodeStatistics::HeapCodeStatistics()
+    : code_and_metadata_size_(0), bytecode_and_metadata_size_(0) {}
 
 bool v8::V8::InitializeICU(const char* icu_data_file) {
   return i::InitializeICU(icu_data_file);
@@ -7458,6 +7460,18 @@ bool Isolate::GetHeapObjectStatisticsAtLastGC(
   return true;
 }
 
+bool Isolate::GetHeapCodeAndMetadataStatistics(
+    HeapCodeStatistics* code_statistics) {
+  if (!code_statistics) return false;
+
+  i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
+  isolate->heap()->CollectCodeStatistics();
+
+  code_statistics->code_and_metadata_size_ = isolate->code_and_metadata_size();
+  code_statistics->bytecode_and_metadata_size_ =
+      isolate->bytecode_and_metadata_size();
+  return true;
+}
 
 void Isolate::GetStackSample(const RegisterState& state, void** frames,
                              size_t frames_limit, SampleInfo* sample_info) {