NotForReview: Implement zero/one-copy texture for ozone freon using Intel DRM

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

Index: ui/ozone/platform/drm/gpu/gbm_surface_factory.cc
diff --git a/ui/ozone/platform/drm/gpu/gbm_surface_factory.cc b/ui/ozone/platform/drm/gpu/gbm_surface_factory.cc
index c3952bddc6c3ead34a6e08b1b9e7cd2abb0ba722..c4d41b6fe8cbffa0c58d006d15498b4a39824149 100644
--- a/ui/ozone/platform/drm/gpu/gbm_surface_factory.cc
+++ b/ui/ozone/platform/drm/gpu/gbm_surface_factory.cc
@@ -21,6 +21,12 @@
 #include "ui/ozone/public/surface_ozone_canvas.h"
 #include "ui/ozone/public/surface_ozone_egl.h"
 
+#if defined(OZONE_USE_VGEM_MAP)
+#include "base/command_line.h"
+#include "ui/ozone/platform/drm/gpu/intel_drm_pixmap.h"
+#include "ui/ozone/public/ozone_switches.h"
+#endif
+
 namespace ui {
 
 GbmSurfaceFactory::GbmSurfaceFactory(bool allow_surfaceless)
@@ -118,6 +124,18 @@ scoped_refptr<ui::NativePixmap> GbmSurfaceFactory::CreateNativePixmap(
   scoped_refptr<GbmDevice> gbm = GetGbmDevice(widget);
   DCHECK(gbm);
 
+#if defined(OZONE_USE_VGEM_MAP)
+  bool enable_intel_drm = base::CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kOzoneUseIntelDrm);
+  if (enable_intel_drm && usage == gfx::BufferUsage::MAP) {
+    scoped_refptr<IntelDrmPixmap> pixmap = IntelDrmPixmap::Create(
+        base::FileDescriptor(gbm->get_fd(), false), format, size);
+    if (!pixmap.get())
+      return nullptr;
+    return pixmap;
+  }
+#endif
+
   scoped_refptr<GbmBuffer> buffer =
       GbmBuffer::CreateBuffer(gbm, format, size, usage);
   if (!buffer.get())