Upstream Layout.java and associated files

chrome/android/javatests/src/org/chromium/chrome/browser/compositor/eventfilter/MockEventFilterHost.java

+// Copyright 2015 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.compositor.eventfilter;
+
+import android.view.MotionEvent;
+
+import org.chromium.chrome.browser.compositor.layouts.eventfilter.EventFilterHost;
+
+/**
+ * Most basic {@link EventFilterHost}.
+ */
+public class MockEventFilterHost implements EventFilterHost {
+    public MockEventFilterHost() {
+    }
+
+    @Override
+    public boolean propagateEvent(MotionEvent e) {
+        return false;
+    }
+
+    @Override
+    public int getViewportWidth() {
+        return 0;
+    }
+}