Make counter and histogram related callbacks part of the Isolate::CreateParams.

include/v8.h

 // 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.
 
 /** \mainpage V8 API Reference Guide
  *
  * V8 is Google's open source JavaScript engine.
  *
  * This set of documents provides reference material generated from the
  * V8 header file, include/v8.h.
@@ skipping 4885 matching lines @@
  * thread at any given time.  The Locker/Unlocker API must be used to
  * synchronize.
  */
 class V8_EXPORT Isolate {
  public:
   /**
    * Initial configuration parameters for a new Isolate.
    */
   struct CreateParams {
     CreateParams()
-        : entry_hook(NULL), code_event_handler(NULL), snapshot_blob(NULL) {}
+        : entry_hook(NULL),
+          code_event_handler(NULL),
+          snapshot_blob(NULL),
+          counter_lookup_callback(NULL),
+          create_histogram_callback(NULL),
+          add_histogram_sample_callback(NULL) {}
 
     /**
      * The optional entry_hook allows the host application to provide the
      * address of a function that's invoked on entry to every V8-generated
      * function.  Note that entry_hook is invoked at the very start of each
      * generated function. Furthermore, if an  entry_hook is given, V8 will
      * always run without a context snapshot.
      */
     FunctionEntryHook entry_hook;
 
     /**
      * Allows the host application to provide the address of a function that is
      * notified each time code is added, moved or removed.
      */
     JitCodeEventHandler code_event_handler;
 
     /**
      * ResourceConstraints to use for the new Isolate.
      */
     ResourceConstraints constraints;
 
     /**
      * Explicitly specify a startup snapshot blob. The embedder owns the blob.
      */
     StartupData* snapshot_blob;
+
+
+    /**
+     * Enables the host application to provide a mechanism for recording
+     * statistics counters.
+     */
+    CounterLookupCallback counter_lookup_callback;
+
+    /**
+     * Enables the host application to provide a mechanism for recording
+     * histograms. The CreateHistogram function returns a
+     * histogram which will later be passed to the AddHistogramSample
+     * function.
+     */
+    CreateHistogramCallback create_histogram_callback;
+    AddHistogramSampleCallback add_histogram_sample_callback;
   };
 
 
   /**
    * Stack-allocated class which sets the isolate for all operations
    * executed within a local scope.
    */
   class V8_EXPORT Scope {
    public:
     explicit Scope(Isolate* isolate) : isolate_(isolate) {
@@ skipping 2974 matching lines @@
  */
 
 
 }  // namespace v8
 
 
 #undef TYPE_CHECK
 
 
 #endif  // V8_H_