Create A/B test of SDCH...

chrome/renderer/render_view.cc

 // Copyright (c) 2009 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/render_view.h"
 
 #include <algorithm>
 #include <string>
 #include <vector>
 
@@ skipping 1308 matching lines @@
                                  WebFrame* frame) {
   UpdateTitle(frame, title);
 
   // Also check whether we have new encoding name.
   UpdateEncoding(frame, webview->GetMainFrameEncodingName());
 }
 
 void RenderView::DidFinishLoadForFrame(WebView* webview, WebFrame* frame) {
   WebDataSource* ds = frame->GetDataSource();
   NavigationState* navigation_state = NavigationState::FromDataSource(ds);
-  // TODO(darin): It should not be possible for navigation_state to be null 
+  // TODO(darin): It should not be possible for navigation_state to be null
   // here!
   if (navigation_state)
     navigation_state->set_finish_load_time(Time::Now());
 }
 
 void RenderView::DidFailLoadWithError(WebView* webview,
                                       const WebURLError& error,
                                       WebFrame* frame) {
   // Currently this function is empty. When you implement something here and it
   // will display any error messages in HTML, please make sure to call
   // frame->SetInViewSourceMode(false) not to show them in view source mode.
 }
 
 void RenderView::DidFinishDocumentLoadForFrame(WebView* webview,
                                                WebFrame* frame) {
   WebDataSource* ds = frame->GetDataSource();
   NavigationState* navigation_state = NavigationState::FromDataSource(ds);
-  // TODO(darin): It should not be possible for navigation_state to be null 
+  // TODO(darin): It should not be possible for navigation_state to be null
   // here!
   if (navigation_state)
     navigation_state->set_finish_document_load_time(Time::Now());
 
   Send(new ViewHostMsg_DocumentLoadedInFrame(routing_id_));
 
   // The document has now been fully loaded.  Scan for password forms to be
   // sent up to the browser.
   SendPasswordForms(frame);
 
@@ skipping 1529 matching lines @@
     UMA_HISTOGRAM_MEDIUM_TIMES("Renderer4.RequestToStart", start - request);
   }
   UMA_HISTOGRAM_MEDIUM_TIMES("Renderer4.StartToCommit", commit - start);
   UMA_HISTOGRAM_MEDIUM_TIMES(
       "Renderer4.CommitToFinishDoc", finish_doc - commit);
   UMA_HISTOGRAM_MEDIUM_TIMES(
       "Renderer4.FinishDocToFinish", finish - finish_doc);
 
   UMA_HISTOGRAM_MEDIUM_TIMES("Renderer4.BeginToCommit", commit - begin);
   UMA_HISTOGRAM_MEDIUM_TIMES("Renderer4.BeginToFinishDoc", finish_doc - begin);
+
+  static const TimeDelta kBeginToFinishMin(TimeDelta::FromMilliseconds(10));
+  static const TimeDelta kBeginToFinishMax(TimeDelta::FromMinutes(10));
+  static const size_t kBeginToFinishBucketCount(100);
+
+  UMA_HISTOGRAM_CUSTOM_TIMES("Renderer4.BeginToFinish",
+      finish - begin, kBeginToFinishMin,
+      kBeginToFinishMax, kBeginToFinishBucketCount);
+
+  DCHECK(FieldTrialList::Find("DnsImpact") &&
+         !FieldTrialList::Find("DnsImpact")->group_name().empty());
   UMA_HISTOGRAM_CUSTOM_TIMES(
       FieldTrial::MakeName("Renderer4.BeginToFinish", "DnsImpact").data(),
-      finish - begin, TimeDelta::FromMilliseconds(10),
-      TimeDelta::FromMinutes(10), 100);
+      finish - begin, kBeginToFinishMin,
+      kBeginToFinishMax, kBeginToFinishBucketCount);
+
+  DCHECK(FieldTrialList::Find("GlobalSdch") &&
+         !FieldTrialList::Find("GlobalSdch")->group_name().empty());
+  UMA_HISTOGRAM_CUSTOM_TIMES(
+      FieldTrial::MakeName("Renderer4.BeginToFinish", "GlobalSdch").data(),
+      finish - begin, kBeginToFinishMin,
+      kBeginToFinishMax, kBeginToFinishBucketCount);
 
   UMA_HISTOGRAM_MEDIUM_TIMES("Renderer4.CommitToFinish", finish - commit);
 
   if (!first_paint.is_null()) {
     UMA_HISTOGRAM_MEDIUM_TIMES(
         "Renderer4.BeginToFirstPaint", first_paint - begin);
     UMA_HISTOGRAM_MEDIUM_TIMES(
         "Renderer4.CommitToFirstPaint", first_paint - commit);
   }
 
@@ skipping 54 matching lines @@
     Send(new ViewHostMsg_PasswordFormsSeen(routing_id_, password_forms));
 }
 
 void RenderView::Print(WebFrame* frame, bool script_initiated) {
   DCHECK(frame);
   if (print_helper_.get() == NULL) {
     print_helper_.reset(new PrintWebViewHelper(this));
   }
   print_helper_->Print(frame, script_initiated);
 }