FakeVideoCaptureDevice: support 4K capture resolution

This CL adds 4K resolution to the Fake Video Capture Device, a.k.a. the
rolling pacman.

TEST= unittests and
./out/desktop/chrome --use-fake-device-for-media-stream https://codepen.io/miguelao/full/bGNgOYq


Bug: 1010457
Change-Id: Ibcab5e83a8bb09dbf4f1e6866951f1ccb9e41f41
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1974995
Commit-Queue: Miguel Casas <mcasas@chromium.org>
Auto-Submit: Miguel Casas <mcasas@chromium.org>
Reviewed-by: Andres Calderon Jaramillo <andrescj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#726603}

media/capture/video/fake_video_capture_device_factory.cc

@@ -29,9 +29,9 @@ static const int kDefaultDeviceCount = 1;
 static const char* kDefaultDeviceIdMask = "/dev/video%d";
 static const media::FakeVideoCaptureDevice::DeliveryMode kDefaultDeliveryMode =
     media::FakeVideoCaptureDevice::DeliveryMode::USE_DEVICE_INTERNAL_BUFFERS;
-static constexpr std::array<gfx::Size, 5> kDefaultResolutions{
+static constexpr std::array<gfx::Size, 6> kDefaultResolutions{
     {gfx::Size(96, 96), gfx::Size(320, 240), gfx::Size(640, 480),
-     gfx::Size(1280, 720), gfx::Size(1920, 1080)}};
+     gfx::Size(1280, 720), gfx::Size(1920, 1080), gfx::Size(3840, 2160)}};
 static constexpr std::array<float, 1> kDefaultFrameRates{{20.0f}};
 
 static const double kInitialPan = 100.0;

media/capture/video/fake_video_capture_device_unittest.cc

@@ -147,6 +147,8 @@ TEST_P(FakeVideoCaptureDeviceTest, CaptureUsing) {
   resolutions_to_test.emplace_back(gfx::Size(0, 720), gfx::Size(96, 96));
   resolutions_to_test.emplace_back(gfx::Size(1920, 1080),
                                    gfx::Size(1920, 1080));
+  resolutions_to_test.emplace_back(gfx::Size(3840, 2160),
+                                   gfx::Size(3840, 2160));
 
   for (const auto& resolution : resolutions_to_test) {
     std::unique_ptr<MockVideoCaptureDeviceClient> client = CreateClient();
@@ -201,7 +203,7 @@ TEST_F(FakeVideoCaptureDeviceTest, GetDeviceSupportedFormats) {
     VideoCaptureFormats supported_formats;
     video_capture_device_factory_->GetSupportedFormats(descriptors_iterator,
                                                        &supported_formats);
-    ASSERT_EQ(5u, supported_formats.size());
+    ASSERT_EQ(6u, supported_formats.size());
     VideoPixelFormat expected_format =
         expected_format_by_device_index[device_index];
     EXPECT_EQ(96, supported_formats[0].frame_size.width());
@@ -224,6 +226,10 @@ TEST_F(FakeVideoCaptureDeviceTest, GetDeviceSupportedFormats) {
     EXPECT_EQ(1080, supported_formats[4].frame_size.height());
     EXPECT_EQ(expected_format, supported_formats[4].pixel_format);
     EXPECT_GE(supported_formats[4].frame_rate, 20.0);
+    EXPECT_EQ(3840, supported_formats[5].frame_size.width());
+    EXPECT_EQ(2160, supported_formats[5].frame_size.height());
+    EXPECT_EQ(expected_format, supported_formats[5].pixel_format);
+    EXPECT_GE(supported_formats[5].frame_rate, 20.0);
     device_index++;
   }
 }