[webnfc] Add WebNFC feature flag

content/browser/android/content_feature_list.cc

 // Copyright 2017 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.
 
 #include "content/browser/android/content_feature_list.h"
 
 #include "base/android/jni_string.h"
 #include "base/feature_list.h"
 #include "base/macros.h"
+#include "content/public/common/content_features.h"
 #include "jni/ContentFeatureList_jni.h"
 
 using base::android::ConvertJavaStringToUTF8;
 using base::android::JavaParamRef;
 
 namespace content {
 namespace android {
 
 namespace {
 
 // Array of features exposed through the Java ContentFeatureList API. Entries in
 // this array may either refer to features defined in the header of this file or
 // in other locations in the code base (e.g. content_features.h).
 const base::Feature* kFeaturesExposedToJava[] = {
-    &kRequestUnbufferedDispatch,
+    &kRequestUnbufferedDispatch, &features::kWebNfc,
 };
 
 const base::Feature* FindFeatureExposedToJava(const std::string& feature_name) {
   for (size_t i = 0; i < arraysize(kFeaturesExposedToJava); ++i) {
     if (kFeaturesExposedToJava[i]->name == feature_name)
       return kFeaturesExposedToJava[i];
   }
   NOTREACHED() << "Queried feature cannot be found in ContentFeatureList: "
                << feature_name;
   return nullptr;
@@ skipping 12 matching lines @@
       FindFeatureExposedToJava(ConvertJavaStringToUTF8(env, jfeature_name));
   return base::FeatureList::IsEnabled(*feature);
 }
 
 bool RegisterContentFeatureListJni(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace android
 }  // namespace content