Pause drawing webvr when the App button is pressed

chrome/browser/android/vr_shell/ui_scene_manager_unittest.cc

+// Copyright 2017 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.
+
+#include "chrome/browser/android/vr_shell/ui_scene_manager.h"
+
+#include "base/macros.h"
+#include "base/threading/thread_task_runner_handle.h"
+#include "chrome/browser/android/vr_shell/ui_scene.h"
+#include "chrome/browser/android/vr_shell/vr_thread_envoy.h"
+#include "testing/gmock/include/gmock/gmock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace vr_shell {
+
+namespace {
+
+using testing::Return;
+
+class FakeTaskRunner : public base::SingleThreadTaskRunner {
+ public:
+  FakeTaskRunner() : thread_id_(base::PlatformThread::CurrentId()) {}
+
+  bool PostDelayedTask(const tracked_objects::Location& from_here,
+                       base::OnceClosure task,
+                       base::TimeDelta delay) override {
+    // Drop the delayed task.
+    return false;
+  }
+
+  bool PostNonNestableDelayedTask(const tracked_objects::Location& from_here,
+                                  base::OnceClosure task,
+                                  base::TimeDelta delay) override {
+    // Drop the delayed task.
+    return false;
+  }
+
+  bool RunsTasksOnCurrentThread() const override {
+    return thread_id_ == base::PlatformThread::CurrentId();
+  }
+
+ protected:
+  ~FakeTaskRunner() override {}
+
+  base::PlatformThreadId thread_id_;
+
+  DISALLOW_COPY_AND_ASSIGN(FakeTaskRunner);
+};
+
+class MockVrThreadEnvoy : public VrThreadEnvoy {
+ public:
+  MockVrThreadEnvoy() : weak_ptr_factory_(this) {}
+  ~MockVrThreadEnvoy() override{};
+
+  base::WeakPtr<VrThreadEnvoy> GetWeakPtr() {
+    return weak_ptr_factory_.GetWeakPtr();
+  }
+
+  MOCK_METHOD0(GetVrShell, base::WeakPtr<VrShell>());
+  MOCK_METHOD0(GetMainThreadTaskRunner,
+               scoped_refptr<base::SingleThreadTaskRunner>());
+
+ private:
+  base::WeakPtrFactory<VrThreadEnvoy> weak_ptr_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(MockVrThreadEnvoy);
+};
+
+}  // namespace
+
+TEST(UiSceneManager, AppButtonPressed) {
+  std::unique_ptr<MockVrThreadEnvoy> envoy =

[cjgrant, 2017/04/28 18:25:23]

A scene manager test base class should probably make the envoy, scene and
manager, so that a specific test just has to feed the manager an input and
verify a result.

[ymalik, 2017/05/02 17:46:00]

Done.

+      base::MakeUnique<MockVrThreadEnvoy>();
+  std::unique_ptr<UiScene> scene = base::MakeUnique<UiScene>();
+  EXPECT_CALL(*envoy, GetMainThreadTaskRunner())
+      .Times(1)
+      .WillOnce(Return(
+          scoped_refptr<base::SingleThreadTaskRunner>(new FakeTaskRunner)));
+  EXPECT_CALL(*envoy, GetVrShell()).Times(1).WillOnce(Return(nullptr));

[cjgrant, 2017/04/28 18:25:23]

Based on my top level comment, I figure this would be better as:

shell_proxy = new shell proxy
manager = new manager(shell_proxy)
EXPECT(shell_proxy, ShowWebVr(false)
manager->AppButtonPressed()

It's weird that we're testing that scene manager fished for task runners, as
opposed to calling a method in response to input.

[ymalik, 2017/05/02 17:46:00]

Done.

+
+  std::unique_ptr<UiSceneManager> manager =
+      base::MakeUnique<UiSceneManager>(envoy->GetWeakPtr(), scene.get());
+  manager->AppButtonPressed();
+}
+
+}  // namespace vr_shell