[TTS] Add server control from a field_trial param.

chrome/browser/android/contextualsearch/contextual_search_delegate.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 "chrome/browser/android/contextualsearch/contextual_search_delegate.h"
 
 #include <algorithm>
 #include <utility>
 
 #include "base/base64.h"
@@ skipping 54 matching lines @@
 const char kDoPreventPreloadValue[] = "1";
 
 // The number of characters that should be shown after the selected expression.
 const int kSurroundingSizeForUI = 60;
 
 // The version of the Contextual Cards API that we want to invoke.
 const int kContextualCardsNoIntegration = 0;
 const int kContextualCardsBarIntegration = 1;
 const int kContextualCardsSingleAction = 2;
 
-const char kContextualCardsVersionOverride[] = "contextual_cards_version";
-
 }  // namespace
 
 // URLFetcher ID, only used for tests: we only have one kind of fetcher.
 const int ContextualSearchDelegate::kContextualSearchURLFetcherID = 1;
 
 // Handles tasks for the ContextualSearchManager in a separable, testable way.
 ContextualSearchDelegate::ContextualSearchDelegate(
     net::URLRequestContextGetter* url_request_context,
     TemplateURLService* template_url_service,
     const ContextualSearchDelegate::SearchTermResolutionCallback&
@@ skipping 146 matching lines @@
       TemplateURLRef::SearchTermsArgs(base::string16());
 
   int contextual_cards_version = kContextualCardsNoIntegration;
   if (field_trial_->IsContextualCardsBarIntegrationEnabled())
     contextual_cards_version = kContextualCardsBarIntegration;
   if (base::FeatureList::IsEnabled(
           chrome::android::kContextualSearchSingleActions)) {
     contextual_cards_version = kContextualCardsSingleAction;
   }
 
-  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
-      kContextualCardsVersionOverride)){
-    contextual_cards_version =
-        std::stoi(base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
-            kContextualCardsVersionOverride), nullptr);
+  if (field_trial_->GetContextualCardsVersion() != 0) {
+    contextual_cards_version = field_trial_->GetContextualCardsVersion();
   }
 
   TemplateURLRef::SearchTermsArgs::ContextualSearchParams params(
       kContextualSearchRequestVersion, contextual_cards_version, home_country);
 
   search_terms_args.contextual_search_params = params;
 
   std::string request(
       template_url->contextual_search_url_ref().ReplaceSearchTerms(
           search_terms_args,
@@ skipping 347 matching lines @@
     end_offset -= trim;
   }
   if (result_text.length() > end_offset + padding_each_side_pinned) {
     // Trim the end.
     result_text = result_text.substr(0, end_offset + padding_each_side_pinned);
   }
   *start = start_offset;
   *end = end_offset;
   return result_text;
 }