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

ui/ozone/platform/drm/common/drm_util.cc

Index: ui/ozone/platform/drm/common/drm_util.cc
diff --git a/ui/ozone/platform/drm/common/drm_util.cc b/ui/ozone/platform/drm/common/drm_util.cc
index 97130378d930cbde9ac373a47185b4cdd6718632..21cfc1a72e2e0e85f24c79a3e4dc1da517cf19e2 100644
--- a/ui/ozone/platform/drm/common/drm_util.cc
+++ b/ui/ozone/platform/drm/common/drm_util.cc
@@ -5,6 +5,7 @@
 #include "ui/ozone/platform/drm/common/drm_util.h"
 
 #include <drm_fourcc.h>
+#include <gbm.h>
 #include <stdint.h>
 #include <stdlib.h>
 #include <sys/mman.h>
@@ -518,6 +519,36 @@ int GetFourCCFormatForOpaqueFramebuffer(gfx::BufferFormat format) {
   }
 }
 
+uint32_t GetGbmFlagsFromBufferUsage(gfx::BufferUsage usage) {
+  switch (usage) {
+    case gfx::BufferUsage::GPU_READ:
+      return GBM_BO_USE_TEXTURING;
+    case gfx::BufferUsage::SCANOUT:
+      return GBM_BO_USE_SCANOUT;
+    case gfx::BufferUsage::SCANOUT_CPU_READ_WRITE:
+      return GBM_BO_USE_SCANOUT | GBM_BO_USE_LINEAR;
+    case gfx::BufferUsage::GPU_READ_CPU_READ_WRITE:
+    case gfx::BufferUsage::GPU_READ_CPU_READ_WRITE_PERSISTENT:
+      return GBM_BO_USE_TEXTURING | GBM_BO_USE_LINEAR;
+  }
+}
+
+gfx::BufferUsage GetBufferUsageFromGbmFlags(int flags) {
+  switch (flags) {
+    case GBM_BO_USE_TEXTURING:

[gurchetansingh, 2017/06/28 20:59:18]

After the gbm.h change lands, you still have to roll minigbm in
~/src/third_party/minigbm/ in the Chrome tree before this can land.

+      return gfx::BufferUsage::GPU_READ;
+    case GBM_BO_USE_SCANOUT:
+      return gfx::BufferUsage::SCANOUT;
+    case GBM_BO_USE_SCANOUT | GBM_BO_USE_LINEAR:
+      return gfx::BufferUsage::SCANOUT_CPU_READ_WRITE;
+    case GBM_BO_USE_TEXTURING | GBM_BO_USE_LINEAR:
+      return gfx::BufferUsage::GPU_READ_CPU_READ_WRITE;
+    default:
+      NOTREACHED();
+      return gfx::BufferUsage::SCANOUT;
+  }
+}
+
 MovableDisplaySnapshots CreateMovableDisplaySnapshotsFromParams(
     const std::vector<DisplaySnapshot_Params>& displays) {
   MovableDisplaySnapshots snapshots;