Move native "enable-webapk" check to ChromeWebApkHost.

chrome/browser/android/webapk/chrome_webapk_host.cc

Index: chrome/browser/android/webapk/chrome_webapk_host.cc
diff --git a/chrome/browser/android/webapk/chrome_webapk_host.cc b/chrome/browser/android/webapk/chrome_webapk_host.cc
new file mode 100644
index 0000000000000000000000000000000000000000..4014e2f6fbd9811ae0bb45a627de8bbbf79b57e7
--- /dev/null
+++ b/chrome/browser/android/webapk/chrome_webapk_host.cc
@@ -0,0 +1,13 @@
+// Copyright 2016 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 "chrome/browser/android/webapk/chrome_webapk_host.h"
+
+#include "jni/ChromeWebApkHost_jni.h"
+
+// static
+bool ChromeWebApkHost::AreWebApkEnabled() {
+  JNIEnv* env = base::android::AttachCurrentThread();
+  return Java_ChromeWebApkHost_areWebApkEnabled(env);
+}