Implement DRM Native Pixmap using prime buffer

ui/ozone/public/ozone_switches.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/ozone/public/ozone_switches.h"
 
 namespace switches {
 
 // Specify ozone platform implementation to use.
 const char kOzonePlatform[] = "ozone-platform";
 
 // Specify location for image dumps.
 const char kOzoneDumpFile[] = "ozone-dump-file";
 
 // Enable support for a single overlay plane.
 const char kOzoneTestSingleOverlaySupport[] =
     "ozone-test-single-overlay-support";
 
 // Specifies the size of the primary display at initialization.
 const char kOzoneInitialDisplayBounds[] = "ozone-initial-display-bounds";
 
 // Specifies the physical display size in millimeters.
 const char kOzoneInitialDisplayPhysicalSizeMm[] =
     "ozone-initial-display-physical-size-mm";
 
+// Use userspace dma-buf mmap() Linux implementation for native GPU memory
+// buffers.
+const char kOzoneUseDmaBufMmap[] = "ozone-use-dmabuf-mmap";
+
 }  // namespace switches