[EXAMPLE] Change WebView Layout Test to Android JUnit 4 style

android_webview/tools/system_webview_shell/layout_tests/src/org/chromium/webview_shell/test/WebViewLayoutActivityTestRule.java

Index: android_webview/tools/system_webview_shell/layout_tests/src/org/chromium/webview_shell/test/WebViewLayoutActivityTestRule.java
diff --git a/android_webview/tools/system_webview_shell/layout_tests/src/org/chromium/webview_shell/test/WebViewLayoutActivityTestRule.java b/android_webview/tools/system_webview_shell/layout_tests/src/org/chromium/webview_shell/test/WebViewLayoutActivityTestRule.java
new file mode 100644
index 0000000000000000000000000000000000000000..44e30965b0b36dc85a6077b43f796574980c6eae
--- /dev/null
+++ b/android_webview/tools/system_webview_shell/layout_tests/src/org/chromium/webview_shell/test/WebViewLayoutActivityTestRule.java
@@ -0,0 +1,20 @@
+// 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.webview_shell.test;
+
+import android.app.Activity;
+import android.support.test.rule.ActivityTestRule;
+
+public class WebViewLayoutActivityTestRule<T extends Activity> extends ActivityTestRule<T> {
+    private String mModeArgument;
+    private static final String MODE_REBASELINE = "rebaseline";
+
+    public WebViewLayoutActivityTestRule(Class<T> activityClass) {
+        super(activityClass);
+    }
+    public boolean isRebaseline() {
+        return mModeArgument != null ? mModeArgument.equals(MODE_REBASELINE) : false;
+    }
+}