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 "chrome/browser/android/vr_shell/ui_scene.h"
+#include "chrome/browser/android/vr_shell/vr_browser_interface.h"
+#include "testing/gmock/include/gmock/gmock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+using testing::InSequence;
+
+namespace vr_shell {
+
+namespace {
+
+class MockBrowserInterface : public VrBrowserInterface {
+ public:
+  MockBrowserInterface() {}
+  ~MockBrowserInterface() override {}
+
+  MOCK_METHOD1(OnContentPaused, void(bool));
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(MockBrowserInterface);
+};
+
+}  // namespace
+
+class UiSceneManagerTest : public testing::Test {
+ public:
+  void SetUp() override {
+    browser_ = base::MakeUnique<MockBrowserInterface>();
+    scene_ = base::MakeUnique<UiScene>();
+    manager_ = base::MakeUnique<UiSceneManager>(browser_.get(), scene_.get());
+  }
+
+ protected:
+  std::unique_ptr<MockBrowserInterface> browser_;
+  std::unique_ptr<UiScene> scene_;
+  std::unique_ptr<UiSceneManager> manager_;
+};
+
+TEST_F(UiSceneManagerTest, ContentPausesOnAppButtonClick) {
+  InSequence s;
+
+  EXPECT_TRUE(scene_->GetWebVrRenderingEnabled());
+
+  // Clicking app button once should pause content rendering.
+  EXPECT_CALL(*browser_, OnContentPaused(true)).Times(1);
+  manager_->OnAppButtonClicked();
+  EXPECT_FALSE(scene_->GetWebVrRenderingEnabled());
+
+  // Clicking it again should resume content rendering.
+  EXPECT_CALL(*browser_, OnContentPaused(false)).Times(1);
+  manager_->OnAppButtonClicked();
+  EXPECT_TRUE(scene_->GetWebVrRenderingEnabled());
+}
+
+}  // namespace vr_shell