Add a feature flag for enabling transparent doodle request.

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
diff --git a/chrome/app/generated_resources.grd b/chrome/app/generated_resources.grd
index 82397b0a33dbf86ed81062166e4bd2c8517e3a0e..7457662b4952c2e3eda5a0ca4fe9910c7d61567d 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -14830,6 +14830,15 @@ Please check your email at <ph name="ACCOUNT_EMAIL">$2<ex>jane.doe@gmail.com</ex
     </if>
 
     <if expr="is_android">
+      <message name="IDS_FLAGS_ENABLE_NTP_TRANSPARENT_DOODLE_NAME" desc="Name for the flag to enable transparent doodle request." translateable="false">
+        Request transparent Doodle
+      </message>
+      <message name="IDS_FLAGS_ENABLE_NTP_TRANSPARENT_DOODLE_DESCRIPTION" desc="Description for the flag to enable transparent doodle requests." translateable="false">
+        Request a transparent Doodle from Google servers.
+      </message>
+    </if>
+
+    <if expr="is_android">
       <message name="IDS_FLAGS_IME_THREAD_NAME" desc="Name for the flag to use IME thread.">
         Run IME on its own thread.
       </message>