Allow chromecast to use 420V images

Bug: b/158233592
Test: None
Change-Id: I2cb9df2c01e15be5202a2d905c211490d916b814
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2257746
Auto-Submit: Albert Chaulk <achaulk@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Commit-Queue: Albert Chaulk <achaulk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#792367}

gpu/command_buffer/service/feature_info.cc

@@ -193,7 +193,7 @@ FeatureInfo::FeatureInfo(
           .status_values[GPU_FEATURE_TYPE_ANDROID_SURFACE_CONTROL] ==
       gpu::kGpuFeatureStatusEnabled;
 
-#if defined(OS_CHROMEOS)
+#if defined(OS_CHROMEOS) || defined(IS_CHROMECAST)
   feature_flags_.chromium_image_ycbcr_420v = base::Contains(
       gpu_feature_info.supported_buffer_formats_for_allocation_and_texturing,
       gfx::BufferFormat::YUV_420_BIPLANAR);