Cache the ranges_ vector and share the ranges_ vector

chrome/renderer/renderer_histogram_snapshots.cc

-// 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.
 
 #include "chrome/renderer/renderer_histogram_snapshots.h"
 
 #include <ctype.h>
 
 #include "base/logging.h"
 #include "base/message_loop.h"
 #include "base/metrics/histogram.h"
@@ skipping 30 matching lines @@
   return handled;
 }
 
 void RendererHistogramSnapshots::OnGetRendererHistograms(int sequence_number) {
   SendHistograms(sequence_number);
 }
 
 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);
 
   // Send the sequence number and list of pickled histograms over synchronous
   // IPC, so we can clear pickled_histograms_ afterwards.
   RenderThread::current()->Send(
       new ViewHostMsg_RendererHistograms(
           sequence_number, pickled_histograms_));
 
   pickled_histograms_.clear();
@@ skipping 18 matching lines @@
 void RendererHistogramSnapshots::UniqueInconsistencyDetected(int problem) {
   UMA_HISTOGRAM_ENUMERATION("Histogram.InconsistenciesRendererUnique",
                             problem, Histogram::NEVER_EXCEEDED_VALUE);
 }
 
 void RendererHistogramSnapshots::SnapshotProblemResolved(int amount) {
   UMA_HISTOGRAM_COUNTS("Histogram.InconsistentSnapshotRenderer",
                        std::abs(amount));
 }