Cache the ranges_ vector and share the ranges_ vector

chrome/browser/browser_about_handler.cc

Index: chrome/browser/browser_about_handler.cc
===================================================================
--- chrome/browser/browser_about_handler.cc	(revision 97408)
+++ chrome/browser/browser_about_handler.cc	(working copy)
@@ -782,6 +782,8 @@
 std::string AboutHistograms(const std::string& query) {
   TimeDelta wait_time = TimeDelta::FromMilliseconds(10000);
 
+  base::StatisticsRecorder::CollectHistogramStats("Browser");

[jar (doing other things), 2011/10/04 22:32:38]

We probably don't want to collect these here, as they will confuse the upload
stats.  It is possibly nice for debugging, and if you'd like, you can put this
in an ifndef NDEBUG.

[ramant (doing other things), 2011/10/19 01:09:52]

Done.

+
   HistogramSynchronizer* current_synchronizer =
       HistogramSynchronizer::CurrentSynchronizer();
   DCHECK(current_synchronizer != NULL);