Add a feature flag for enabling transparent doodle request.

chrome/browser/android/logo_service.cc

Index: chrome/browser/android/logo_service.cc
diff --git a/chrome/browser/android/logo_service.cc b/chrome/browser/android/logo_service.cc
index e89109c38a075b1bb5b27f93369c2b40b5c5999a..6a980230f383003b800c1ae71459740a318d2a82 100644
--- a/chrome/browser/android/logo_service.cc
+++ b/chrome/browser/android/logo_service.cc
@@ -4,9 +4,11 @@
 
 #include "chrome/browser/android/logo_service.h"
 
+#include "base/feature_list.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/thread_task_runner_handle.h"
+#include "chrome/browser/android/chrome_feature_list.h"
 #include "chrome/browser/image_decoder.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/search_engines/template_url_service_factory.h"
@@ -126,7 +128,7 @@ void LogoService::GetLogo(search_provider_logos::LogoObserver* observer) {
       base::Bind(&search_provider_logos::GoogleParseLogoResponse),
       base::Bind(&search_provider_logos::GoogleAppendQueryparamsToLogoURL),
       true, /* wants_cta */
-      false /* transparent */);
+      base::FeatureList::IsEnabled(chrome::android::kNTPTransparentDoodle));
   logo_tracker_->GetLogo(observer);
 }