Add a feature flag for enabling transparent doodle request.

chrome/browser/android/chrome_feature_list.cc

Index: chrome/browser/android/chrome_feature_list.cc
diff --git a/chrome/browser/android/chrome_feature_list.cc b/chrome/browser/android/chrome_feature_list.cc
index 2a32902632627b3a4b5758bcee03bf54db1620aa..8fb9a5c48a2bf7024b8beb67d40af250fa1e5a01 100644
--- a/chrome/browser/android/chrome_feature_list.cc
+++ b/chrome/browser/android/chrome_feature_list.cc
@@ -36,6 +36,7 @@ const base::Feature* kFeaturesExposedToJava[] = {
     &kNTPOfflinePagesFeature,
     &kNTPSnippetsFeature,
     &kNTPToolbarFeature,
+    &kNTPTransparentDoodle,

[Marc Treib, 2016/05/10 07:58:39]

This one doesn't need to be exposed to Java.

[atanasova, 2016/05/10 08:38:41]

Done.

     &kPhysicalWebFeature,
     &offline_pages::kOfflinePagesBackgroundLoadingFeature,
 };
@@ -64,6 +65,10 @@ const base::Feature kNTPToolbarFeature {
   "NTPToolbar", base::FEATURE_ENABLED_BY_DEFAULT
 };
 
+const base::Feature kNTPTransparentDoodle {
+  "NTPTransparentDoodle", base::FEATURE_DISABLED_BY_DEFAULT
+};
+
 const base::Feature kNTPFakeOmniboxTextFeature {
   "NTPFakeOmniboxText", base::FEATURE_DISABLED_BY_DEFAULT
 };