Allow native_viewport to create new native windows on demand on Android.

shell/android/task_launcher/src/org/chromium/mojo/task_launcher/TaskLauncher.java

Index: shell/android/task_launcher/src/org/chromium/mojo/task_launcher/TaskLauncher.java
diff --git a/shell/android/task_launcher/src/org/chromium/mojo/task_launcher/TaskLauncher.java b/shell/android/task_launcher/src/org/chromium/mojo/task_launcher/TaskLauncher.java
new file mode 100644
index 0000000000000000000000000000000000000000..1b6586f037a95eb73ddfe4b16ca288d095555270
--- /dev/null
+++ b/shell/android/task_launcher/src/org/chromium/mojo/task_launcher/TaskLauncher.java
@@ -0,0 +1,25 @@
+// 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.mojo.task_launcher;
+
+import android.content.Context;
+import android.content.Intent;
+
+import org.chromium.base.CalledByNative;
+import org.chromium.base.JNINamespace;
+import org.chromium.mojo.shell.ViewportActivity;
+
+@JNINamespace("shell::android::task_launcher")
+class TaskLauncher {
+    @CalledByNative
+    public static void sendIntent(Context context) {
+        final Intent newDocumentIntent = new Intent(context, ViewportActivity.class);
+        newDocumentIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_DOCUMENT);
+        newDocumentIntent.addFlags(Intent.FLAG_ACTIVITY_MULTIPLE_TASK);
+        newDocumentIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+
+        context.startActivity(newDocumentIntent);
+    }
+}