Add a field trial for the HTML preload scanner.

chrome/browser/chrome_content_browser_client.cc

 // Copyright (c) 2012 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/chrome_content_browser_client.h"
 
 #include <map>
 #include <set>
 #include <utility>
 #include <vector>
@@ skipping 1168 matching lines @@
     base::CommandLine* command_line) {
   // List of field trials that modify the blink-settings command line flag. No
   // two field trials in the list should specify the same keys, otherwise one
   // field trial may overwrite another. See Source/core/frame/Settings.in in
   // Blink for the list of valid keys.
   static const char* const kBlinkSettingsFieldTrials[] = {
     // Keys: backgroundHtmlParserOutstandingTokenLimit
     //       backgroundHtmlParserPendingTokenLimit
     "BackgroundHtmlParserTokenLimits",
 
+    // Keys: doHtmlPreloadScanning
+    "HtmlPreloadScanning",
+
     // Keys: lowPriorityIframes
     "LowPriorityIFrames",
   };
 
   std::vector<std::string> blink_settings;
   for (const char* field_trial_name : kBlinkSettingsFieldTrials) {
     // Each blink-settings field trial should include a forcing_flag group,
     // to make sure that clients that specify the blink-settings flag on the
     // command line are excluded from the experiment groups. To make
     // sure we assign clients that specify this flag to the forcing_flag
@@ skipping 1298 matching lines @@
       switches::kDisableWebRtcEncryption,
     };
     to_command_line->CopySwitchesFrom(from_command_line,
                                       kWebRtcDevSwitchNames,
                                       arraysize(kWebRtcDevSwitchNames));
   }
 }
 #endif  // defined(ENABLE_WEBRTC)
 
 }  // namespace chrome