Adds support for collecting statistics about code and its metadata.

include/v8.h

Index: include/v8.h
diff --git a/include/v8.h b/include/v8.h
index 3079958d5868cb1182cae32223fa2677b8595b49..fe5a9b96a496abcb6baec5e4f20407f2af776522 100644
--- a/include/v8.h
+++ b/include/v8.h
@@ -5273,6 +5273,18 @@ class V8_EXPORT HeapObjectStatistics {
   friend class Isolate;
 };
 
+class V8_EXPORT HeapCodeStatistics {
+ public:
+  HeapCodeStatistics();
+  size_t code_and_metadata_size() { return code_and_metadata_size_; }
+  size_t bytecode_and_metadata_size() { return bytecode_and_metadata_size_; }
+
+ private:
+  size_t code_and_metadata_size_;
+  size_t bytecode_and_metadata_size_;
+
+  friend class Isolate;
+};
 
 class RetainedObjectInfo;
 
@@ -5780,6 +5792,15 @@ class V8_EXPORT Isolate {
                                        size_t type_index);
 
   /**
+   * Get statistics about code and its metadata in the heap.
+   *
+   * \param object_statistics The HeapCodeStatistics object to fill in
+   *   statistics of code, bytecode and their metadata.
+   * \returns true on success.
+   */
+  bool GetHeapCodeAndMetadataStatistics(HeapCodeStatistics* object_statistics);
+
+  /**
    * Get a call stack sample from the isolate.
    * \param state Execution state.
    * \param frames Caller allocated buffer to store stack frames.