chromeos: decode video into NV12 format instead of RGBA in vaapi decoder

ui/ozone/platform/drm/gpu/drm_thread.cc

Index: ui/ozone/platform/drm/gpu/drm_thread.cc
diff --git a/ui/ozone/platform/drm/gpu/drm_thread.cc b/ui/ozone/platform/drm/gpu/drm_thread.cc
index a4b9867c44fa78fe40c94d75948e3e5b16332665..4123664463672915739c82530b8bd1e245f21eea 100644
--- a/ui/ozone/platform/drm/gpu/drm_thread.cc
+++ b/ui/ozone/platform/drm/gpu/drm_thread.cc
@@ -114,23 +114,7 @@ void DrmThread::CreateBuffer(gfx::AcceleratedWidget widget,
       static_cast<GbmDevice*>(device_manager_->GetDrmDevice(widget).get());
   DCHECK(gbm);
 
-  uint32_t flags = 0;
-  switch (usage) {
-    case gfx::BufferUsage::GPU_READ:
-      flags = GBM_BO_USE_TEXTURING;
-      break;
-    case gfx::BufferUsage::SCANOUT:
-      flags = GBM_BO_USE_SCANOUT;
-      break;
-    case gfx::BufferUsage::SCANOUT_CPU_READ_WRITE:
-      flags = GBM_BO_USE_SCANOUT | GBM_BO_USE_LINEAR;
-      break;
-    case gfx::BufferUsage::GPU_READ_CPU_READ_WRITE:
-    case gfx::BufferUsage::GPU_READ_CPU_READ_WRITE_PERSISTENT:
-      flags = GBM_BO_USE_TEXTURING | GBM_BO_USE_LINEAR;
-      break;
-  }
-
+  uint32_t flags = GetGbmFlagsFromBufferUsage(usage);
   DrmWindow* window = screen_manager_->GetWindow(widget);
   std::vector<uint64_t> modifiers;