Adds an IOSWebViewTypeParam() method to SearchTermsData.

ios/chrome/browser/search_engines/ui_thread_search_terms_data.cc

 // Copyright 2015 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 "ios/chrome/browser/search_engines/ui_thread_search_terms_data.h"
 
 #include "base/logging.h"
 #include "base/strings/string16.h"
 #include "components/google/core/browser/google_url_tracker.h"
 #include "components/google/core/browser/google_util.h"
 #include "components/omnibox/browser/omnibox_field_trial.h"
 #include "components/search/search.h"
 #include "components/version_info/version_info.h"
 #include "ios/chrome/browser/application_context.h"
+#include "ios/chrome/browser/experimental_flags.h"
 #include "ios/chrome/browser/google/google_brand.h"
 #include "ios/chrome/browser/google/google_url_tracker_factory.h"
 #include "ios/chrome/common/channel_info.h"
 #include "ios/web/public/web_thread.h"
+#include "net/base/escape.h"
 #include "url/gurl.h"
 
 #if defined(ENABLE_RLZ)
 #include "components/rlz/rlz_tracker.h"
 #endif
 
 namespace ios {
 
 UIThreadSearchTermsData::UIThreadSearchTermsData(
     ios::ChromeBrowserState* browser_state)
@@ skipping 83 matching lines @@
   // iOS has not InstantService.
   return search::kDisableStartMargin;
 }
 
 std::string UIThreadSearchTermsData::NTPIsThemedParam() const {
   DCHECK(thread_checker_.CalledOnValidThread());
   // iOS does not supports themed NTP.
   return std::string();
 }
 
+std::string UIThreadSearchTermsData::IOSWebViewTypeParam() const {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  std::string param = experimental_flags::GetWKWebViewSearchParams();
+  if (param.empty()) {
+    return std::string();
+  }
+
+  return "&esrch=" + net::EscapeQueryParamValue(param, true);
+}
+
 std::string UIThreadSearchTermsData::GoogleImageSearchSource() const {
   DCHECK(thread_checker_.CalledOnValidThread());
   std::string version(version_info::GetProductName() + " " +
                       version_info::GetVersionNumber());
   if (version_info::IsOfficialBuild())
     version += " (Official)";
   version += " " + version_info::GetOSType();
   std::string modifier(GetChannelString());
   if (!modifier.empty())
     version += " " + modifier;
   return version;
 }
 
 }  // namespace ios