Initial support for Renderer Side Histograms...

chrome/browser/metrics/metrics_service.cc

 // Copyright (c) 2006-2008 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.
 
 
 
 //------------------------------------------------------------------------------
 // Description of the life cycle of a instance of MetricsService.
 //
 //  OVERVIEW
@@ skipping 1737 matching lines @@
   RecordCurrentState(pref);
 }
 
 void MetricsService::RecordCurrentState(PrefService* pref) {
   pref->SetString(prefs::kStabilityLastTimestampSec,
                   Int64ToWString(Time::Now().ToTimeT()));
 
   RecordPluginChanges(pref);
 }
 
+void MetricsService::CollectRendererHistograms() {
+  for (RenderProcessHost::iterator it = RenderProcessHost::begin();
+       it != RenderProcessHost::end(); ++it) {
+    it->second->Send(new ViewMsg_GetRendererHistograms());
+  }
+}
+
 void MetricsService::RecordCurrentHistograms() {
   DCHECK(current_log_);
 
+  CollectRendererHistograms();
+
+  // TODO(raman): Delay the metrics collection activities until we get all the
+  // updates from the renderers, or we time out (1 second?  3 seconds?).
+
   StatisticsRecorder::Histograms histograms;
   StatisticsRecorder::GetHistograms(&histograms);
   for (StatisticsRecorder::Histograms::iterator it = histograms.begin();
        histograms.end() != it;
        ++it) {
     if ((*it)->flags() & kUmaTargetedHistogramFlag)
       // TODO(petersont): Only record historgrams if they are not precluded by
       // the UMA response data.
       // Bug http://code.google.com/p/chromium/issues/detail?id=2739.
       RecordHistogram(**it);
@@ skipping 53 matching lines @@
       L"." + key;
   prof_prefs->SetInteger(pref_key.c_str(), value);
 }
 
 static bool IsSingleThreaded() {
   static PlatformThreadId thread_id = 0;
   if (!thread_id)
     thread_id = PlatformThread::CurrentId();
   return PlatformThread::CurrentId() == thread_id;
 }