Implement a read-size throttle within the TCP socket.

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 3231 matching lines @@
         kBeginToFinishMax, kBeginToFinishBucketCount);
 
   static bool use_cache_histogram2(FieldTrialList::Find("NewEviction") &&
       !FieldTrialList::Find("NewEviction")->group_name().empty());
   if (use_cache_histogram2)
     UMA_HISTOGRAM_CUSTOM_TIMES(
         FieldTrial::MakeName("Renderer4.StartToFinish", "NewEviction").data(),
         finish - start, kBeginToFinishMin,
         kBeginToFinishMax, kBeginToFinishBucketCount);
 
+  static bool use_async_tcp(FieldTrialList::Find("AsyncSlowStart") &&
+      !FieldTrialList::Find("AsyncSlowStart")->group_name().empty());
+  if (use_async_tcp) {
+    UMA_HISTOGRAM_CUSTOM_TIMES(
+        FieldTrial::MakeName("Renderer4.StartToFinish",
+                             "AsyncSlowStart").data(),
+        finish - start, 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);
   }
 
   if (!first_paint_after_load.is_null()) {
@@ skipping 61 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);
 }