Mac: Align SCANOUT{_CPU_READ_WRITE,} formats

This CL aligns the list of native gpu memory buffer formats supported
for the usages SCANOUT and SCANOUT_CPU_READ_WRITE, since all the
formats currently allowed for scanout can be memory mapped.

Bug: b/71837407
Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: Ie5864fd4db2133d0146ae9d0b9f1fa5896d9b802
Reviewed-on: https://chromium-review.googlesource.com/889863
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: David Reveman <reveman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532206}

gpu/ipc/common/gpu_memory_buffer_support.cc

@@ -40,6 +40,7 @@ bool IsNativeGpuMemoryBufferConfigurationSupported(gfx::BufferFormat format,
   switch (usage) {
     case gfx::BufferUsage::GPU_READ:
     case gfx::BufferUsage::SCANOUT:
+    case gfx::BufferUsage::SCANOUT_CPU_READ_WRITE:
       return format == gfx::BufferFormat::BGRA_8888 ||
              format == gfx::BufferFormat::RGBA_8888 ||
              format == gfx::BufferFormat::BGRX_8888 ||
@@ -47,10 +48,6 @@ bool IsNativeGpuMemoryBufferConfigurationSupported(gfx::BufferFormat format,
              format == gfx::BufferFormat::RGBA_F16 ||
              format == gfx::BufferFormat::UYVY_422 ||
              format == gfx::BufferFormat::YUV_420_BIPLANAR;
-    case gfx::BufferUsage::SCANOUT_CPU_READ_WRITE:
-      return format == gfx::BufferFormat::BGRA_8888 ||
-             format == gfx::BufferFormat::RGBA_8888 ||
-             format == gfx::BufferFormat::BGRX_8888;
     case gfx::BufferUsage::GPU_READ_CPU_READ_WRITE:
     case gfx::BufferUsage::GPU_READ_CPU_READ_WRITE_PERSISTENT:
       return format == gfx::BufferFormat::R_8 ||