Enable YUV biplanar support for chromecast

Required for supporting GpuMemoryBuffer backed by NV12 dmabuf.

Bug: b/166284508
Test: Manually on cast device
Change-Id: I18201b53fbd77e0f1e4c4947a346b68ee6895eb0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2417508
Commit-Queue: Michael Spang <spang@chromium.org>
Reviewed-by: Daniel Nicoara <dnicoara@chromium.org>
Reviewed-by: Michael Spang <spang@chromium.org>
Reviewed-by: Albert Chaulk <achaulk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809332}

ui/gfx/linux/client_native_pixmap_dmabuf.cc

@@ -104,7 +104,7 @@ bool ClientNativePixmapDmaBuf::IsConfigurationSupported(
 #endif
 
   bool disable_yuv_biplanar = true;
-#if defined(OS_CHROMEOS)
+#if defined(OS_CHROMEOS) || BUILDFLAG(IS_CHROMECAST)
   // IsConfigurationSupported(SCANOUT_CPU_READ_WRITE) is used by the renderer
   // to tell whether the platform supports sampling a given format. Zero-copy
   // video capture and encoding requires gfx::BufferFormat::YUV_420_BIPLANAR to