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

shell/android/task_launcher/task_launcher.cc

+// 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.
+
+// task_launcher is an application needed by the android shell. Its purpose is
+// to create new android tasks (a.k.a. windows) upon request by the native
+// viewport service.
+
+#include "jni/TaskLauncher_jni.h"
+#include "mojo/common/binding_set.h"
+#include "mojo/public/c/system/main.h"
+#include "mojo/public/cpp/application/application_connection.h"
+#include "mojo/public/cpp/application/application_delegate.h"
+#include "mojo/public/cpp/application/application_runner.h"
+#include "services/native_viewport/native_viewport.mojom.h"
+
+namespace shell {
+namespace android {
+namespace task_launcher {
+
+bool RegisterTaskLauncherJni(JNIEnv* env) {
+  return RegisterNativesImpl(env);
+}
+
+class TaskLauncherAppDelegate
+    : public mojo::ApplicationDelegate,
+      public native_viewport::NativeViewportShellService,
+      public mojo::InterfaceFactory<
+          native_viewport::NativeViewportShellService> {
+ public:
+  bool ConfigureIncomingConnection(
+      mojo::ApplicationConnection* connection) override {
+    // Only accept connections from the native viewport service. Other apps
+    // should go through the native viewport application to obtain new surfaces
+    // to draw on.
+    if (connection->GetRemoteApplicationURL() !=
+        "mojo://native_viewport_service/") {
+      return false;
+    }
+    connection->AddService(this);
+    return true;
+  }
+
+ private:
+  // InterfaceFactory<native_viewport::NativeViewportShellService>
+  void Create(
+      mojo::ApplicationConnection* app,
+      mojo::InterfaceRequest<native_viewport::NativeViewportShellService>
+          request) override {
+    bindings_.AddBinding(this, request.Pass());
+  }
+
+  // native_viewport::NativeViewportShellService
+  void CreateNewNativeWindow() override {
+    JNIEnv* env = base::android::AttachCurrentThread();
+    jobject context = base::android::GetApplicationContext();
+    Java_TaskLauncher_sendIntent(env, context);
+  }
+
+  mojo::BindingSet<native_viewport::NativeViewportShellService> bindings_;
+};
+
+}  // namespace task_launcher
+}  // namespace android
+}  // namespace shell
+
+MojoResult MojoMain(MojoHandle application_request) {
+  mojo::ApplicationRunner runner(
+      new shell::android::task_launcher::TaskLauncherAppDelegate);
+  return runner.Run(application_request);
+}
+
+JNI_EXPORT jint JNI_OnLoad(JavaVM* vm, void* reserved) {
+  base::android::InitVM(vm);
+  JNIEnv* env = base::android::AttachCurrentThread();
+
+  if (!shell::android::task_launcher::RegisterTaskLauncherJni(env))
+    return -1;
+
+  return JNI_VERSION_1_4;
+}
+
+extern "C" JNI_EXPORT void InitApplicationContext(
+    const base::android::JavaRef<jobject>& context) {
+  JNIEnv* env = base::android::AttachCurrentThread();
+  base::android::InitApplicationContext(env, context);
+}