Add NativePixmapDmabufStub to finalize glCreateImageCHROMIUM on Linux.

ui/ozone/platform/drm/gpu/gbm_buffer.h

Index: ui/ozone/platform/drm/gpu/gbm_buffer.h
diff --git a/ui/ozone/platform/drm/gpu/gbm_buffer.h b/ui/ozone/platform/drm/gpu/gbm_buffer.h
index 2823243793ea49ed20ab8ef115bfa22d76bc25fb..067f5ae67cc56e30a21048a60d349ee373dc5b2d 100644
--- a/ui/ozone/platform/drm/gpu/gbm_buffer.h
+++ b/ui/ozone/platform/drm/gpu/gbm_buffer.h
@@ -11,7 +11,7 @@
 #include "base/macros.h"
 #include "ui/gfx/buffer_types.h"
 #include "ui/gfx/geometry/size.h"
-#include "ui/gfx/native_pixmap.h"
+#include "ui/gfx/linux/native_pixmap_dmabuf.h"
 #include "ui/ozone/platform/drm/gpu/gbm_buffer_base.h"
 
 struct gbm_bo;
@@ -49,8 +49,12 @@ class GbmBuffer : public GbmBufferBase {
   int GetOffset(size_t plane) const;
   size_t GetSize(size_t plane) const;
   uint64_t GetFormatModifier(size_t plane) const;
+
+  // GbmBufferBase
   gfx::Size GetSize() const override;
 
+  scoped_refptr<gfx::NativePixmapDmabufHelper> helper() { return helper_; }
+
  private:
   GbmBuffer(const scoped_refptr<GbmDevice>& gbm,
             gbm_bo* bo,
@@ -74,37 +78,26 @@ class GbmBuffer : public GbmBufferBase {
 
   uint32_t format_;
   uint32_t flags_;
-  std::vector<base::ScopedFD> fds_;
   gfx::Size size_;
 
-  std::vector<gfx::NativePixmapPlane> planes_;
+  scoped_refptr<gfx::NativePixmapDmabufHelper> helper_;
 
   DISALLOW_COPY_AND_ASSIGN(GbmBuffer);
 };
 
-class GbmPixmap : public gfx::NativePixmap {
+class GbmPixmap : public gfx::NativePixmapDmaBuf {
  public:
   GbmPixmap(GbmSurfaceFactory* surface_manager,
             const scoped_refptr<GbmBuffer>& buffer);
 
-  void SetProcessingCallback(
-      const ProcessingCallback& processing_callback) override;
-
-  // NativePixmap:
-  void* GetEGLClientBuffer() const override;
-  bool AreDmaBufFdsValid() const override;
-  size_t GetDmaBufFdCount() const override;
-  int GetDmaBufFd(size_t plane) const override;
-  int GetDmaBufPitch(size_t plane) const override;
-  int GetDmaBufOffset(size_t plane) const override;
-  uint64_t GetDmaBufModifier(size_t plane) const override;
-  gfx::BufferFormat GetBufferFormat() const override;
-  gfx::Size GetBufferSize() const override;
+  // NativePixmapDmabuf
   bool ScheduleOverlayPlane(gfx::AcceleratedWidget widget,
                             int plane_z_order,
                             gfx::OverlayTransform plane_transform,
                             const gfx::Rect& display_bounds,
                             const gfx::RectF& crop_rect) override;
+  void SetProcessingCallback(
+      const ProcessingCallback& processing_callback) override;
   gfx::NativePixmapHandle ExportHandle() override;
 
   scoped_refptr<GbmBuffer> buffer() { return buffer_; }