[Media controls] Add rotate-to-fullscreen gesture behind flag

third_party/WebKit/Source/modules/media_controls/MediaControlsRotateToFullscreenDelegateTest.cpp

Index: third_party/WebKit/Source/modules/media_controls/MediaControlsRotateToFullscreenDelegateTest.cpp
diff --git a/third_party/WebKit/Source/modules/media_controls/MediaControlsRotateToFullscreenDelegateTest.cpp b/third_party/WebKit/Source/modules/media_controls/MediaControlsRotateToFullscreenDelegateTest.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..3e831ea97dae1ff90b2ef0580a3474f1a1abbeae
--- /dev/null
+++ b/third_party/WebKit/Source/modules/media_controls/MediaControlsRotateToFullscreenDelegateTest.cpp
@@ -0,0 +1,663 @@
+// 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 "modules/media_controls/MediaControlsRotateToFullscreenDelegate.h"
+
+#include "core/HTMLNames.h"
+#include "core/css/CSSStyleDeclaration.h"
+#include "core/dom/Document.h"
+#include "core/dom/DocumentUserGestureToken.h"
+#include "core/dom/Fullscreen.h"
+#include "core/frame/FrameView.h"
+#include "core/frame/LocalDOMWindow.h"
+#include "core/frame/Settings.h"
+#include "core/html/HTMLAudioElement.h"
+#include "core/html/HTMLVideoElement.h"
+#include "core/loader/EmptyClients.h"
+#include "core/testing/DummyPageHolder.h"
+#include "modules/media_controls/MediaControlsImpl.h"
+#include "platform/UserGestureIndicator.h"
+#include "platform/testing/EmptyWebMediaPlayer.h"
+#include "platform/testing/UnitTestHelpers.h"
+#include "platform/wtf/text/AtomicString.h"
+#include "public/platform/WebSize.h"
+#include "public/platform/modules/screen_orientation/WebScreenOrientationType.h"
+#include "testing/gmock/include/gmock/gmock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+using ::testing::Return;
+
+namespace blink {
+
+using namespace HTMLNames;
+
+namespace {
+
+class MockVideoWebMediaPlayer : public EmptyWebMediaPlayer {
+ public:
+  // ChromeClient overrides:
+  bool HasVideo() const override { return true; }
+
+  MOCK_CONST_METHOD0(NaturalSize, WebSize());
+};
+
+class MockChromeClient : public EmptyChromeClient {
+ public:
+  // ChromeClient overrides:
+  void EnterFullscreen(LocalFrame& frame) override {
+    Fullscreen::From(*frame.GetDocument()).DidEnterFullscreen();
+  }
+  void ExitFullscreen(LocalFrame& frame) override {
+    Fullscreen::From(*frame.GetDocument()).DidExitFullscreen();
+  }
+
+  MOCK_CONST_METHOD0(GetScreenInfo, WebScreenInfo());
+};
+
+class StubLocalFrameClient : public EmptyLocalFrameClient {
+ public:
+  static StubLocalFrameClient* Create() { return new StubLocalFrameClient; }
+
+  std::unique_ptr<WebMediaPlayer> CreateWebMediaPlayer(
+      HTMLMediaElement&,
+      const WebMediaPlayerSource&,
+      WebMediaPlayerClient*) override {
+    return WTF::MakeUnique<MockVideoWebMediaPlayer>();
+  }
+};
+
+}  // anonymous namespace
+
+class MediaControlsRotateToFullscreenDelegateTest : public ::testing::Test {
+ protected:
+  using SimpleOrientation =
+      MediaControlsRotateToFullscreenDelegate::SimpleOrientation;
+
+  void SetUp() override {
+    previous_video_rotate_to_fullscreen_value_ =
+        RuntimeEnabledFeatures::videoRotateToFullscreenEnabled();
+    RuntimeEnabledFeatures::setVideoRotateToFullscreenEnabled(true);
+
+    chrome_client_ = new MockChromeClient();
+
+    Page::PageClients clients;
+    FillWithEmptyClients(clients);
+    clients.chrome_client = chrome_client_.Get();
+
+    page_holder_ = DummyPageHolder::Create(IntSize(800, 600), &clients,
+                                           StubLocalFrameClient::Create());
+
+    video_ = HTMLVideoElement::Create(GetDocument());
+    GetVideo().setAttribute(controlsAttr, g_empty_atom);
+    // Most tests should call GetDocument().body()->AppendChild(&GetVideo());
+    // This is not done automatically, so that tests control timing of `Attach`.
+  }
+
+  void TearDown() override {
+    RuntimeEnabledFeatures::setVideoRotateToFullscreenEnabled(
+        previous_video_rotate_to_fullscreen_value_);
+  }
+
+  static bool HasDelegate(const MediaControls& media_controls) {
+    return !!static_cast<const MediaControlsImpl*>(&media_controls)
+                 ->rotate_to_fullscreen_delegate_;
+  }
+
+  static bool HasOrientationLockDelegate(const MediaControls& media_controls) {
+    return !!static_cast<const MediaControlsImpl*>(&media_controls)
+                 ->orientation_lock_delegate_;
+  }
+
+  void SimulateVideoReadyState(HTMLMediaElement::ReadyState state) {
+    GetVideo().SetReadyState(state);
+  }
+
+  SimpleOrientation ObservedScreenOrientation() const {
+    return GetMediaControls()
+        .rotate_to_fullscreen_delegate_->current_screen_orientation_;
+  }
+
+  SimpleOrientation ComputeVideoOrientation() const {
+    return GetMediaControls()
+        .rotate_to_fullscreen_delegate_->ComputeVideoOrientation();
+  }
+
+  bool IsObservingVisibility() const {
+    return GetMediaControls()
+        .rotate_to_fullscreen_delegate_->visibility_observer_;
+  }
+
+  bool ObservedVisibility() const {
+    return GetMediaControls().rotate_to_fullscreen_delegate_->is_visible_;
+  }
+
+  void DisableControls() {
+    // If scripts are not enabled, controls will always be shown.
+    page_holder_->GetFrame().GetSettings()->SetScriptEnabled(true);
+
+    GetVideo().removeAttribute(controlsAttr);
+  }
+
+  void DispatchEvent(EventTarget& target, const AtomicString& type) {
+    target.DispatchEvent(Event::Create(type));
+  }
+
+  void InitScreenAndVideo(WebScreenOrientationType initial_screen_orientation,
+                          WebSize video_size);
+
+  void PlayVideo();
+
+  void UpdateVisibilityObserver() {
+    // Let IntersectionObserver update.
+    GetDocument().View()->UpdateAllLifecyclePhases();
+    testing::RunPendingTasks();
+  }
+
+  void RotateTo(WebScreenOrientationType new_screen_orientation);
+
+  MockChromeClient& GetChromeClient() const { return *chrome_client_; }
+  LocalDOMWindow& GetWindow() const { return *GetDocument().domWindow(); }
+  Document& GetDocument() const { return page_holder_->GetDocument(); }
+  HTMLVideoElement& GetVideo() const { return *video_; }
+  MediaControlsImpl& GetMediaControls() const {
+    return *static_cast<MediaControlsImpl*>(GetVideo().GetMediaControls());
+  }
+  MockVideoWebMediaPlayer& GetWebMediaPlayer() const {
+    return *static_cast<MockVideoWebMediaPlayer*>(
+        GetVideo().GetWebMediaPlayer());
+  }
+
+ private:
+  bool previous_video_rotate_to_fullscreen_value_;
+  Persistent<MockChromeClient> chrome_client_;
+  std::unique_ptr<DummyPageHolder> page_holder_;
+  Persistent<HTMLVideoElement> video_;
+};
+
+void MediaControlsRotateToFullscreenDelegateTest::InitScreenAndVideo(
+    WebScreenOrientationType initial_screen_orientation,
+    WebSize video_size) {
+  // Set initial screen orientation (called by `Attach` during `AppendChild`).
+  WebScreenInfo screen_info;
+  screen_info.orientation_type = initial_screen_orientation;
+  EXPECT_CALL(GetChromeClient(), GetScreenInfo())
+      .Times(1)
+      .WillOnce(Return(screen_info));
+
+  // Set up the WebMediaPlayer instance.
+  GetDocument().body()->AppendChild(&GetVideo());
+  GetVideo().SetSrc("https://example.com");
+  testing::RunPendingTasks();
+  SimulateVideoReadyState(HTMLMediaElement::kHaveMetadata);
+
+  // Set video size.
+  EXPECT_CALL(GetWebMediaPlayer(), NaturalSize())
+      .WillRepeatedly(Return(video_size));
+}
+
+void MediaControlsRotateToFullscreenDelegateTest::PlayVideo() {
+  {
+    UserGestureIndicator gesture(
+        DocumentUserGestureToken::Create(&GetDocument()));
+    GetVideo().Play();
+  }
+  testing::RunPendingTasks();
+}
+
+void MediaControlsRotateToFullscreenDelegateTest::RotateTo(
+    WebScreenOrientationType new_screen_orientation) {
+  WebScreenInfo screen_info;
+  screen_info.orientation_type = new_screen_orientation;
+  EXPECT_CALL(GetChromeClient(), GetScreenInfo())
+      .Times(1)
+      .WillOnce(Return(screen_info));
+  DispatchEvent(GetWindow(), EventTypeNames::orientationchange);
+  testing::RunPendingTasks();
+}
+
+TEST_F(MediaControlsRotateToFullscreenDelegateTest, DelegateRequiresFlag) {
+  // SetUp turns the flag on by default.
+  GetDocument().body()->AppendChild(&GetVideo());
+  EXPECT_TRUE(HasDelegate(GetMediaControls()));
+
+  // No delegate when flag is off.
+  RuntimeEnabledFeatures::setVideoRotateToFullscreenEnabled(false);
+  HTMLVideoElement* video = HTMLVideoElement::Create(GetDocument());
+  GetDocument().body()->AppendChild(video);
+  EXPECT_FALSE(HasDelegate(*video->GetMediaControls()));
+}
+
+TEST_F(MediaControlsRotateToFullscreenDelegateTest, DelegateRequiresVideo) {
+  HTMLAudioElement* audio = HTMLAudioElement::Create(GetDocument());
+  GetDocument().body()->AppendChild(audio);
+  EXPECT_FALSE(HasDelegate(*audio->GetMediaControls()));
+}
+
+TEST_F(MediaControlsRotateToFullscreenDelegateTest,
+       OrientationLockIsMutuallyExclusive) {
+  // Rotate to fullscreen and fullscreen orientation lock are currently
+  // incompatible, so if both are enabled only one should be active.
+  RuntimeEnabledFeatures::setVideoRotateToFullscreenEnabled(true);
+  RuntimeEnabledFeatures::setVideoFullscreenOrientationLockEnabled(true);
+  HTMLVideoElement* video = HTMLVideoElement::Create(GetDocument());
+  GetDocument().body()->AppendChild(video);
+  EXPECT_TRUE(HasDelegate(*video->GetMediaControls()));
+  EXPECT_FALSE(HasOrientationLockDelegate(*video->GetMediaControls()));
+}
+
+TEST_F(MediaControlsRotateToFullscreenDelegateTest, ComputeVideoOrientation) {
+  // Set up the WebMediaPlayer instance.
+  GetDocument().body()->AppendChild(&GetVideo());
+  GetVideo().SetSrc("https://example.com");
+  testing::RunPendingTasks();
+
+  // Each `ComputeVideoOrientation` calls `NaturalSize` twice, except the first
+  // one where the video is not yet ready.
+  EXPECT_CALL(GetWebMediaPlayer(), NaturalSize())
+      .Times(12)
+      .WillOnce(Return(WebSize(400, 400)))
+      .WillOnce(Return(WebSize(400, 400)))
+      .WillOnce(Return(WebSize(300, 200)))
+      .WillOnce(Return(WebSize(300, 200)))
+      .WillOnce(Return(WebSize(200, 300)))
+      .WillOnce(Return(WebSize(200, 300)))
+      .WillOnce(Return(WebSize(300, 199)))
+      .WillOnce(Return(WebSize(300, 199)))
+      .WillOnce(Return(WebSize(199, 300)))
+      .WillOnce(Return(WebSize(199, 300)))
+      .WillOnce(Return(WebSize(0, 0)))
+      .WillOnce(Return(WebSize(0, 0)));
+
+  // Video is not yet ready.
+  EXPECT_EQ(SimpleOrientation::kUnknown, ComputeVideoOrientation());
+
+  SimulateVideoReadyState(HTMLMediaElement::kHaveMetadata);
+
+  // 400x400 is square, which is currently treated as landscape.
+  EXPECT_EQ(SimpleOrientation::kLandscape, ComputeVideoOrientation());
+  // 300x200 is landscape.
+  EXPECT_EQ(SimpleOrientation::kLandscape, ComputeVideoOrientation());
+  // 200x300 is portrait.
+  EXPECT_EQ(SimpleOrientation::kPortrait, ComputeVideoOrientation());
+  // 300x199 is too small.
+  EXPECT_EQ(SimpleOrientation::kUnknown, ComputeVideoOrientation());
+  // 199x300 is too small.
+  EXPECT_EQ(SimpleOrientation::kUnknown, ComputeVideoOrientation());
+  // 0x0 is empty.
+  EXPECT_EQ(SimpleOrientation::kUnknown, ComputeVideoOrientation());
+}
+
+TEST_F(MediaControlsRotateToFullscreenDelegateTest,
+       OnlyObserveVisibilityWhenPlaying) {
+  // Should not initially be observing visibility.
+  GetDocument().body()->AppendChild(&GetVideo());
+  EXPECT_FALSE(IsObservingVisibility());
+
+  // Should start observing visibility when played.
+  {
+    UserGestureIndicator gesture(
+        DocumentUserGestureToken::Create(&GetDocument()));
+    GetVideo().Play();
+  }
+  testing::RunPendingTasks();
+  EXPECT_TRUE(IsObservingVisibility());
+  EXPECT_FALSE(ObservedVisibility());
+
+  // Should have observed visibility once compositor updates.
+  GetDocument().View()->UpdateAllLifecyclePhases();
+  testing::RunPendingTasks();
+  EXPECT_TRUE(ObservedVisibility());
+
+  // Should stop observing visibility when paused.
+  GetVideo().pause();
+  testing::RunPendingTasks();
+  EXPECT_FALSE(IsObservingVisibility());
+  EXPECT_FALSE(ObservedVisibility());
+
+  // Should resume observing visibility when playback resumes.
+  {
+    UserGestureIndicator gesture(
+        DocumentUserGestureToken::Create(&GetDocument()));
+    GetVideo().Play();
+  }
+  testing::RunPendingTasks();
+  EXPECT_TRUE(IsObservingVisibility());
+  EXPECT_FALSE(ObservedVisibility());
+
+  // Should have observed visibility once compositor updates.
+  GetDocument().View()->UpdateAllLifecyclePhases();
+  testing::RunPendingTasks();
+  EXPECT_TRUE(ObservedVisibility());
+}
+
+TEST_F(MediaControlsRotateToFullscreenDelegateTest,
+       EnterSuccessPortraitToLandscape) {
+  // Portrait screen, landscape video.
+  InitScreenAndVideo(kWebScreenOrientationPortraitPrimary, WebSize(640, 480));
+  EXPECT_EQ(SimpleOrientation::kPortrait, ObservedScreenOrientation());
+  EXPECT_EQ(SimpleOrientation::kLandscape, ComputeVideoOrientation());
+
+  // Play video.
+  PlayVideo();
+  UpdateVisibilityObserver();
+
+  EXPECT_TRUE(ObservedVisibility());
+  EXPECT_FALSE(GetVideo().IsFullscreen());
+
+  // Rotate screen to landscape.
+  RotateTo(kWebScreenOrientationLandscapePrimary);
+
+  // Should enter fullscreen.
+  EXPECT_TRUE(GetVideo().IsFullscreen());
+}
+
+TEST_F(MediaControlsRotateToFullscreenDelegateTest,
+       EnterSuccessLandscapeToPortrait) {
+  // Landscape screen, portrait video.
+  InitScreenAndVideo(kWebScreenOrientationLandscapePrimary, WebSize(480, 640));
+  EXPECT_EQ(SimpleOrientation::kLandscape, ObservedScreenOrientation());
+  EXPECT_EQ(SimpleOrientation::kPortrait, ComputeVideoOrientation());
+
+  // Play video.
+  PlayVideo();
+  UpdateVisibilityObserver();
+
+  EXPECT_TRUE(ObservedVisibility());
+  EXPECT_FALSE(GetVideo().IsFullscreen());
+
+  // Rotate screen to portrait.
+  RotateTo(kWebScreenOrientationPortraitPrimary);
+
+  // Should enter fullscreen.
+  EXPECT_TRUE(GetVideo().IsFullscreen());
+}
+
+TEST_F(MediaControlsRotateToFullscreenDelegateTest,
+       EnterSuccessSquarePortraitToLandscape) {
+  // Portrait screen, square video.
+  InitScreenAndVideo(kWebScreenOrientationPortraitPrimary, WebSize(400, 400));
+  EXPECT_EQ(SimpleOrientation::kPortrait, ObservedScreenOrientation());
+  EXPECT_EQ(SimpleOrientation::kLandscape, ComputeVideoOrientation());
+
+  // Play video.
+  PlayVideo();
+  UpdateVisibilityObserver();
+
+  EXPECT_TRUE(ObservedVisibility());
+  EXPECT_FALSE(GetVideo().IsFullscreen());
+
+  // Rotate screen to landscape.
+  RotateTo(kWebScreenOrientationLandscapePrimary);
+
+  // Should enter fullscreen, since square videos are currently treated the same
+  // as landscape videos.
+  EXPECT_TRUE(GetVideo().IsFullscreen());
+}
+
+TEST_F(MediaControlsRotateToFullscreenDelegateTest, EnterFailWrongOrientation) {
+  // Landscape screen, landscape video.
+  InitScreenAndVideo(kWebScreenOrientationLandscapePrimary, WebSize(640, 480));
+  EXPECT_EQ(SimpleOrientation::kLandscape, ObservedScreenOrientation());
+  EXPECT_EQ(SimpleOrientation::kLandscape, ComputeVideoOrientation());
+
+  // Play video.
+  PlayVideo();
+  UpdateVisibilityObserver();
+
+  EXPECT_TRUE(ObservedVisibility());
+
+  // Rotate screen to portrait.
+  RotateTo(kWebScreenOrientationPortraitPrimary);
+
+  // Should not enter fullscreen since the orientation that the device was
+  // rotated to does not match the orientation of the video.
+  EXPECT_FALSE(GetVideo().IsFullscreen());
+}
+
+TEST_F(MediaControlsRotateToFullscreenDelegateTest,
+       EnterFailSquareWrongOrientation) {
+  // Landscape screen, square video.
+  InitScreenAndVideo(kWebScreenOrientationLandscapePrimary, WebSize(400, 400));
+  EXPECT_EQ(SimpleOrientation::kLandscape, ObservedScreenOrientation());
+  EXPECT_EQ(SimpleOrientation::kLandscape, ComputeVideoOrientation());
+
+  // Play video.
+  PlayVideo();
+  UpdateVisibilityObserver();
+
+  EXPECT_TRUE(ObservedVisibility());
+
+  // Rotate screen to portrait.
+  RotateTo(kWebScreenOrientationPortraitPrimary);
+
+  // Should not enter fullscreen since square videos are treated as landscape,
+  // so rotating to portrait does not match the orientation of the video.
+  EXPECT_FALSE(GetVideo().IsFullscreen());
+}
+
+TEST_F(MediaControlsRotateToFullscreenDelegateTest, EnterFailNoControls) {
+  DisableControls();
+
+  // Portrait screen, landscape video.
+  InitScreenAndVideo(kWebScreenOrientationPortraitPrimary, WebSize(640, 480));
+  EXPECT_EQ(SimpleOrientation::kPortrait, ObservedScreenOrientation());
+  EXPECT_EQ(SimpleOrientation::kLandscape, ComputeVideoOrientation());
+
+  // Play video.
+  PlayVideo();
+  UpdateVisibilityObserver();
+
+  EXPECT_TRUE(ObservedVisibility());
+
+  // Rotate screen to landscape.
+  RotateTo(kWebScreenOrientationLandscapePrimary);
+
+  // Should not enter fullscreen since video has no controls.
+  EXPECT_FALSE(GetVideo().IsFullscreen());
+}
+
+TEST_F(MediaControlsRotateToFullscreenDelegateTest, EnterFailPaused) {
+  // Portrait screen, landscape video.
+  InitScreenAndVideo(kWebScreenOrientationPortraitPrimary, WebSize(640, 480));
+  EXPECT_EQ(SimpleOrientation::kPortrait, ObservedScreenOrientation());
+  EXPECT_EQ(SimpleOrientation::kLandscape, ComputeVideoOrientation());
+
+  EXPECT_FALSE(ObservedVisibility());
+
+  UpdateVisibilityObserver();
+
+  EXPECT_FALSE(ObservedVisibility());
+
+  // Rotate screen to landscape.
+  RotateTo(kWebScreenOrientationLandscapePrimary);
+
+  // Should not enter fullscreen since video is paused.
+  EXPECT_FALSE(GetVideo().IsFullscreen());
+}
+
+TEST_F(MediaControlsRotateToFullscreenDelegateTest, EnterFailHidden) {
+  // Portrait screen, landscape video.
+  InitScreenAndVideo(kWebScreenOrientationPortraitPrimary, WebSize(640, 480));
+  EXPECT_EQ(SimpleOrientation::kPortrait, ObservedScreenOrientation());
+  EXPECT_EQ(SimpleOrientation::kLandscape, ComputeVideoOrientation());
+
+  // Play video.
+  PlayVideo();
+  UpdateVisibilityObserver();
+
+  EXPECT_TRUE(ObservedVisibility());
+
+  // Move video offscreen.
+  GetDocument().body()->style()->setProperty("margin-top", "-999px", "",
+                                             ASSERT_NO_EXCEPTION);
+
+  UpdateVisibilityObserver();
+
+  EXPECT_FALSE(ObservedVisibility());
+
+  // Rotate screen to landscape.
+  RotateTo(kWebScreenOrientationLandscapePrimary);
+
+  // Should not enter fullscreen since video is not visible.
+  EXPECT_FALSE(GetVideo().IsFullscreen());
+}
+
+TEST_F(MediaControlsRotateToFullscreenDelegateTest,
+       EnterFail180DegreeRotation) {
+  // Landscape screen, landscape video.
+  InitScreenAndVideo(kWebScreenOrientationLandscapeSecondary,
+                     WebSize(640, 480));
+  EXPECT_EQ(SimpleOrientation::kLandscape, ObservedScreenOrientation());
+  EXPECT_EQ(SimpleOrientation::kLandscape, ComputeVideoOrientation());
+
+  // Play video.
+  PlayVideo();
+  UpdateVisibilityObserver();
+
+  EXPECT_TRUE(ObservedVisibility());
+
+  // Rotate screen 180 degrees to the opposite landscape (without passing via a
+  // portrait orientation).
+  RotateTo(kWebScreenOrientationLandscapePrimary);
+
+  // Should not enter fullscreen since this is a 180 degree orientation.
+  EXPECT_FALSE(GetVideo().IsFullscreen());
+}
+
+TEST_F(MediaControlsRotateToFullscreenDelegateTest, EnterFailSmall) {
+  // Portrait screen, small landscape video.
+  InitScreenAndVideo(kWebScreenOrientationPortraitPrimary, WebSize(300, 199));
+  EXPECT_EQ(SimpleOrientation::kPortrait, ObservedScreenOrientation());
+  EXPECT_EQ(SimpleOrientation::kUnknown, ComputeVideoOrientation());
+
+  // Play video.
+  PlayVideo();
+  UpdateVisibilityObserver();
+
+  EXPECT_TRUE(ObservedVisibility());
+
+  // Rotate screen to landscape.
+  RotateTo(kWebScreenOrientationLandscapePrimary);
+
+  // Should not enter fullscreen since video is too small.
+  EXPECT_FALSE(GetVideo().IsFullscreen());
+}
+
+TEST_F(MediaControlsRotateToFullscreenDelegateTest,
+       EnterFailDocumentFullscreen) {
+  // Portrait screen, landscape video.
+  InitScreenAndVideo(kWebScreenOrientationPortraitPrimary, WebSize(640, 480));
+  EXPECT_EQ(SimpleOrientation::kPortrait, ObservedScreenOrientation());
+  EXPECT_EQ(SimpleOrientation::kLandscape, ComputeVideoOrientation());
+
+  // Simulate the webpage requesting fullscreen on some other element than the
+  // video (in this case document.body).
+  {
+    UserGestureIndicator gesture(
+        DocumentUserGestureToken::Create(&GetDocument()));
+    Fullscreen::RequestFullscreen(*GetDocument().body());
+  }
+  testing::RunPendingTasks();
+  EXPECT_TRUE(Fullscreen::IsCurrentFullScreenElement(*GetDocument().body()));
+  EXPECT_FALSE(GetVideo().IsFullscreen());
+
+  // Play video.
+  PlayVideo();
+  UpdateVisibilityObserver();
+
+  EXPECT_TRUE(ObservedVisibility());
+
+  // Rotate screen to landscape.
+  RotateTo(kWebScreenOrientationLandscapePrimary);
+
+  // Should not enter fullscreen on video, since document is already fullscreen.
+  EXPECT_TRUE(Fullscreen::IsCurrentFullScreenElement(*GetDocument().body()));
+  EXPECT_FALSE(GetVideo().IsFullscreen());
+}
+
+TEST_F(MediaControlsRotateToFullscreenDelegateTest,
+       ExitSuccessLandscapeFullscreenToPortraitInline) {
+  // Landscape screen, landscape video.
+  InitScreenAndVideo(kWebScreenOrientationLandscapePrimary, WebSize(640, 480));
+  EXPECT_EQ(SimpleOrientation::kLandscape, ObservedScreenOrientation());
+  EXPECT_EQ(SimpleOrientation::kLandscape, ComputeVideoOrientation());
+
+  // Start in fullscreen.
+  {
+    UserGestureIndicator gesture(
+        DocumentUserGestureToken::Create(&GetDocument()));
+    GetMediaControls().EnterFullscreen();
+  }
+  testing::RunPendingTasks();
+  EXPECT_TRUE(GetVideo().IsFullscreen());
+
+  // Leave video paused (playing is not a requirement to exit fullscreen).
+  EXPECT_TRUE(GetVideo().paused());
+  EXPECT_FALSE(ObservedVisibility());
+
+  // Rotate screen to portrait.
+  RotateTo(kWebScreenOrientationPortraitPrimary);
+
+  // Should exit fullscreen.
+  EXPECT_FALSE(GetVideo().IsFullscreen());
+}
+
+TEST_F(MediaControlsRotateToFullscreenDelegateTest,
+       ExitSuccessPortraitFullscreenToLandscapeInline) {
+  // Portrait screen, portrait video.
+  InitScreenAndVideo(kWebScreenOrientationPortraitPrimary, WebSize(480, 640));
+  EXPECT_EQ(SimpleOrientation::kPortrait, ObservedScreenOrientation());
+  EXPECT_EQ(SimpleOrientation::kPortrait, ComputeVideoOrientation());
+
+  // Start in fullscreen.
+  {
+    UserGestureIndicator gesture(
+        DocumentUserGestureToken::Create(&GetDocument()));
+    GetMediaControls().EnterFullscreen();
+  }
+  testing::RunPendingTasks();
+  EXPECT_TRUE(GetVideo().IsFullscreen());
+
+  // Leave video paused (playing is not a requirement to exit fullscreen).
+  EXPECT_TRUE(GetVideo().paused());
+  EXPECT_FALSE(ObservedVisibility());
+
+  // Rotate screen to landscape.
+  RotateTo(kWebScreenOrientationLandscapePrimary);
+
+  // Should exit fullscreen.
+  EXPECT_FALSE(GetVideo().IsFullscreen());
+}
+
+TEST_F(MediaControlsRotateToFullscreenDelegateTest,
+       ExitFailDocumentFullscreen) {
+  // Landscape screen, landscape video.
+  InitScreenAndVideo(kWebScreenOrientationLandscapePrimary, WebSize(640, 480));
+  EXPECT_EQ(SimpleOrientation::kLandscape, ObservedScreenOrientation());
+  EXPECT_EQ(SimpleOrientation::kLandscape, ComputeVideoOrientation());
+
+  // Simulate the webpage requesting fullscreen on some other element than the
+  // video (in this case document.body).
+  {
+    UserGestureIndicator gesture(
+        DocumentUserGestureToken::Create(&GetDocument()));
+    Fullscreen::RequestFullscreen(*GetDocument().body());
+  }
+  testing::RunPendingTasks();
+  EXPECT_TRUE(Fullscreen::IsCurrentFullScreenElement(*GetDocument().body()));
+  EXPECT_FALSE(GetVideo().IsFullscreen());
+
+  // Leave video paused (playing is not a requirement to exit fullscreen).
+  EXPECT_TRUE(GetVideo().paused());
+  EXPECT_FALSE(ObservedVisibility());
+
+  // Rotate screen to portrait.
+  RotateTo(kWebScreenOrientationPortraitPrimary);
+
+  // Should not exit fullscreen, since video was not the fullscreen element.
+  EXPECT_TRUE(Fullscreen::IsCurrentFullScreenElement(*GetDocument().body()));
+  EXPECT_FALSE(GetVideo().IsFullscreen());
+}
+
+}  // namespace blink