Adds some histograms from various omnibox queries. I'm doing this as

chrome/browser/autocomplete/autocomplete.cc

 // 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/browser/autocomplete/autocomplete.h"
 
 #include <algorithm>
 
 #include "base/basictypes.h"
 #include "base/command_line.h"
 #include "base/i18n/number_formatting.h"
+#include "base/metrics/histogram.h"
 #include "base/string_number_conversions.h"
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/autocomplete/autocomplete_controller_delegate.h"
 #include "chrome/browser/autocomplete/autocomplete_match.h"
 #include "chrome/browser/autocomplete/builtin_provider.h"
 #include "chrome/browser/autocomplete/history_contents_provider.h"
 #include "chrome/browser/autocomplete/history_quick_provider.h"
 #include "chrome/browser/autocomplete/history_url_provider.h"
 #include "chrome/browser/autocomplete/keyword_provider.h"
@@ skipping 823 matching lines @@
   //
   // NOTE: This comes after constructing |input_| above since that construction
   // can change the text string (e.g. by stripping off a leading '?').
   const bool minimal_changes = (input_.text() == old_input_text) &&
       (input_.synchronous_only() == old_synchronous_only);
 
   expire_timer_.Stop();
 
   // Start the new query.
   in_start_ = true;
+  base::TimeTicks start_time = base::TimeTicks::Now();
   for (ACProviders::iterator i(providers_.begin()); i != providers_.end();
        ++i) {
     (*i)->Start(input_, minimal_changes);
     if (synchronous_only)
       DCHECK((*i)->done());
   }
+  if (!synchronous_only && text.size() < 6) {
+    base::TimeTicks end_time = base::TimeTicks::Now();
+    std::string name = "Omnibox.QueryTime." + base::IntToString(text.size());
+    scoped_refptr<base::Histogram> counter = base::Histogram::FactoryGet(
+        name, 1, 1000, 50, base::Histogram::kUmaTargetedHistogramFlag);
+    counter->Add((end_time - start_time).InMilliseconds());
+  }
   in_start_ = false;
   CheckIfDone();
   UpdateResult(true);
 
   if (!done_)
     StartExpireTimer();
 }
 
 void AutocompleteController::Stop(bool clear_result) {
   for (ACProviders::const_iterator i(providers_.begin()); i != providers_.end();
@@ skipping 101 matching lines @@
     }
   }
   done_ = true;
 }
 
 void AutocompleteController::StartExpireTimer() {
   if (result_.HasCopiedMatches())
     expire_timer_.Start(base::TimeDelta::FromMilliseconds(kExpireTimeMS),
                         this, &AutocompleteController::ExpireCopiedEntries);
 }