ozone: Implement zero/one-copy texture for Ozone GBM.

ui/ozone/public/native_pixmap.h

Index: ui/ozone/public/native_pixmap.h
diff --git a/ui/ozone/public/native_pixmap.h b/ui/ozone/public/native_pixmap.h
index d3369c0b3a9f0f4049d0760c8abdd0bce73153de..9cd124c217e6f3022770cd42090cdc45ec7d09dc 100644
--- a/ui/ozone/public/native_pixmap.h
+++ b/ui/ozone/public/native_pixmap.h
@@ -19,6 +19,12 @@ class NativePixmap : public base::RefCountedThreadSafe<NativePixmap> {
   virtual int GetDmaBufFd() = 0;
   virtual int GetDmaBufPitch() = 0;
 
+  enum BufferUsage {
+    MAP,
+    SCANOUT,
+  };
+  virtual BufferUsage GetBufferUsage() const = 0;
+
  protected:
   virtual ~NativePixmap() {}