WebAPKs: Fix play-install variations check

chrome/browser/android/webapk/chrome_webapk_host.cc

 // 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 "chrome/browser/android/chrome_feature_list.h"
+#include "components/variations/variations_associated_data.h"
 #include "jni/ChromeWebApkHost_jni.h"
 
+namespace {
+
+// Variations flag to enable installing WebAPKs using Google Play.
+const char* kPlayInstall = "play_install";
+
+}  // anonymous namespace
+
+// static
+bool ChromeWebApkHost::Register(JNIEnv* env) {
+  return RegisterNativesImpl(env);
+}
+
 // static
 bool ChromeWebApkHost::AreWebApkEnabled() {
   JNIEnv* env = base::android::AttachCurrentThread();
   return Java_ChromeWebApkHost_areWebApkEnabled(env);
 }
+
+// static
+jboolean CanUseGooglePlayToInstallWebApk(
+    JNIEnv* env,
+    const base::android::JavaParamRef<jclass>& clazz) {
+  return variations::GetVariationParamValueByFeature(
+             chrome::android::kImprovedA2HS, kPlayInstall) == "true";
+}