Make chrome_shell_apk build

components/variations/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 if (is_android) {
   import("//build/config/android/rules.gni")
 }
 
 static_library("variations") {
   sources = [
@@ skipping 34 matching lines @@
     "//components/variations/proto",
     "//third_party/mt19937ar",
   ]
 
   if (is_android) {
     deps += [ ":jni" ]
   }
 }
 
 if (is_android) {
+  # GYP: //components/variations.gypi:variations_jni_headers
   generate_jni("jni") {
     sources = [
       "android/java/src/org/chromium/components/variations/VariationsAssociatedData.java",
     ]
     jni_package = "variations"
   }
 }