Add a PhysicalWebEnvironment class

chrome/android/java/src/org/chromium/chrome/browser/physicalweb/PhysicalWebEnvironment.java

Index: chrome/android/java/src/org/chromium/chrome/browser/physicalweb/PhysicalWebEnvironment.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/physicalweb/PhysicalWebEnvironment.java b/chrome/android/java/src/org/chromium/chrome/browser/physicalweb/PhysicalWebEnvironment.java
new file mode 100644
index 0000000000000000000000000000000000000000..26655d3e0a1233d0bea741edd50e8f661e668c2d
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/physicalweb/PhysicalWebEnvironment.java
@@ -0,0 +1,37 @@
+// 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.
+
+package org.chromium.chrome.browser.physicalweb;
+
+import org.chromium.base.ThreadUtils;
+import org.chromium.chrome.browser.ChromeApplication;
+
+/**
+ * Tool that reports information about conflicting clients.
+ */
+public class PhysicalWebEnvironment {
+    private static PhysicalWebEnvironment sInstance = null;
+
+    /**
+     * Get a singleton instance of this class.
+     * @param chromeApplication An instance of {@link ChromeApplication}, used to get the
+     * appropriate PhysicalWebEnvironment implementation.
+     * @return an instance of this class (or subclass) as decided by the application parameter
+     */
+    public static PhysicalWebEnvironment getInstance(ChromeApplication chromeApplication) {
+        ThreadUtils.assertOnUiThread();
+        if (sInstance == null) {
+            sInstance = chromeApplication.createPhysicalWebEnvironment();
+        }
+        return sInstance;
+    }
+
+    /**
+     * Reports whether the environment has another notification-based Physical Web client enabled.
+     * @return true if there is another notification-based Physical Web client enabled.
+     */
+    public boolean hasNotificationBasedClient() {
+        return false;
+    }
+}