[Android] Refactor the native test wrappers.

testing/android/native_test/java/src/org/chromium/native_test/NativeBrowserTestActivity.java

Index: testing/android/native_test/java/src/org/chromium/native_test/NativeBrowserTestActivity.java
diff --git a/testing/android/native_test/java/src/org/chromium/native_test/NativeBrowserTestActivity.java b/testing/android/native_test/java/src/org/chromium/native_test/NativeBrowserTestActivity.java
new file mode 100644
index 0000000000000000000000000000000000000000..ac2ddeef84a6dbca5b71775ae60e536965f2757c
--- /dev/null
+++ b/testing/android/native_test/java/src/org/chromium/native_test/NativeBrowserTestActivity.java
@@ -0,0 +1,46 @@
+// 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.native_test;
+
+import android.os.Bundle;
+
+/**
+ * An {@link android.app.Activity} for running native browser tests.
+ */
+public abstract class NativeBrowserTestActivity extends NativeTestActivity {
+
+    private static final String BROWSER_TESTS_FLAGS[] = {
+        // content::kSingleProcessTestsFlag
+        "--single_process",
+
+        // switches::kUseFakeDeviceForMediaStream
+        "--use-fake-device-for-media-stream",
+
+        // switches::kUseFakeUIForMediaStream
+        "--use-fake-ui-for-media-stream"
+    };
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        for (String flag : BROWSER_TESTS_FLAGS) {
+            appendCommandLineFlags(flag);
+        }
+    }
+
+    @Override
+    public void onStart() {
+        initializeBrowserProcess();
+        super.onStart();
+    }
+
+    /** Initializes the browser process.
+     *
+     *  This generally includes loading native libraries and switching to the native command line,
+     *  among other things.
+     */
+    protected abstract void initializeBrowserProcess();
+
+}