Cache the ranges_ vector and share the ranges_ vector

chrome/renderer/renderer_histogram_snapshots.cc

Index: chrome/renderer/renderer_histogram_snapshots.cc
===================================================================
--- chrome/renderer/renderer_histogram_snapshots.cc	(revision 106341)
+++ chrome/renderer/renderer_histogram_snapshots.cc	(working copy)
@@ -1,4 +1,4 @@
-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
@@ -51,6 +51,8 @@
 void RendererHistogramSnapshots::UploadAllHistrograms(int sequence_number) {
   DCHECK_EQ(0u, pickled_histograms_.size());
 
+  StatisticsRecorder::CollectHistogramStats("Renderer");
+
   // Push snapshots into our pickled_histograms_ vector.
   TransmitAllHistograms(Histogram::kIPCSerializationSourceFlag, false);