[Contextual Search] Add command line flag for contextual cards version override

chrome/browser/android/contextualsearch/contextual_search_delegate.cc

Index: chrome/browser/android/contextualsearch/contextual_search_delegate.cc
diff --git a/chrome/browser/android/contextualsearch/contextual_search_delegate.cc b/chrome/browser/android/contextualsearch/contextual_search_delegate.cc
index 7b07a3e3359a388e576932cd20b80b71dd5e81e7..f170cd054592562ec444ceae0a4a2a609bcf4aa7 100644
--- a/chrome/browser/android/contextualsearch/contextual_search_delegate.cc
+++ b/chrome/browser/android/contextualsearch/contextual_search_delegate.cc
@@ -72,6 +72,8 @@ 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.
@@ -235,6 +237,13 @@ std::string ContextualSearchDelegate::BuildRequestUrl(std::string selection) {
     contextual_cards_version = kContextualCardsSingleAction;
   }
 
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+      kContextualCardsVersionOverride)){
+    contextual_cards_version =
+        std::stoi(base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
+            kContextualCardsVersionOverride), nullptr);
+  }
+
   TemplateURLRef::SearchTermsArgs::ContextualSearchParams params(
       kContextualSearchRequestVersion, selected_text, std::string(),
       contextual_cards_version);