[TTS] Add server control from a field_trial param.

chrome/browser/android/contextualsearch/contextual_search_field_trial.cc

Index: chrome/browser/android/contextualsearch/contextual_search_field_trial.cc
diff --git a/chrome/browser/android/contextualsearch/contextual_search_field_trial.cc b/chrome/browser/android/contextualsearch/contextual_search_field_trial.cc
index d139053cd68db4a93a6f077e254a7cbe181ff289..8e8310f2df1039206275a9215a5efe18599b9ef6 100644
--- a/chrome/browser/android/contextualsearch/contextual_search_field_trial.cc
+++ b/chrome/browser/android/contextualsearch/contextual_search_field_trial.cc
@@ -21,6 +21,8 @@ const char kContextualSearchIcingSurroundingSizeParamName[] =
 const char kContextualSearchSendURLDisabledParamName[] = "disable_send_url";
 const char kContextualSearchDecodeMentionsDisabledParamName[] =
     "disable_decode_mentions";
+const char kContextualCardsVersionParamName[] = "contextual_cards_version";
+
 // The default size of the content surrounding the selection to gather, allowing
 // room for other parameters.
 const int kContextualSearchDefaultContentSize = 1536;
@@ -43,7 +45,9 @@ ContextualSearchFieldTrial::ContextualSearchFieldTrial()
       is_decode_mentions_disabled_cached_(false),
       is_decode_mentions_disabled_(false),
       is_contextual_cards_bar_integration_enabled_cached_(false),
-      is_contextual_cards_bar_integration_enabled_(false) {}
+      is_contextual_cards_bar_integration_enabled_(false),
+      is_contextual_cards_version_cached_(false),
+      contextual_cards_version_(0) {}
 
 ContextualSearchFieldTrial::~ContextualSearchFieldTrial() {}
 
@@ -90,6 +94,12 @@ bool ContextualSearchFieldTrial::IsContextualCardsBarIntegrationEnabled() {
       &is_contextual_cards_bar_integration_enabled_);
 }
 
+int ContextualSearchFieldTrial::GetContextualCardsVersion() {
+  return GetIntParamValueOrDefault(kContextualCardsVersionParamName, 0,
+                                   &is_contextual_cards_version_cached_,
+                                   &contextual_cards_version_);
+}
+
 bool ContextualSearchFieldTrial::GetBooleanParam(const std::string& name,
                                                  bool* is_value_cached,
                                                  bool* cached_value) {