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

include/v8.h

Index: include/v8.h
diff --git a/include/v8.h b/include/v8.h
index 755a87fdba14f78c70e9ec8bd05a6852a65a49ce..4c30b1f1d581b23fb6f45812310483772562d86d 100644
--- a/include/v8.h
+++ b/include/v8.h
@@ -4903,7 +4903,12 @@ class V8_EXPORT 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
@@ -4929,6 +4934,22 @@ class V8_EXPORT Isolate {
      * 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;
   };