Add NativePixmapHandle type & interface for exporting them

ui/gfx/BUILD.gn

 # 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.
 
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 
 if (is_android) {
   import("//build/config/android/config.gni")
   import("//build/config/android/rules.gni")
@@ skipping 124 matching lines @@
     "image/image_util_ios.mm",
     "interpolated_transform.cc",
     "interpolated_transform.h",
     "linux_font_delegate.cc",
     "linux_font_delegate.h",
     "mac/coordinate_conversion.h",
     "mac/coordinate_conversion.mm",
     "mac/nswindow_frame_controls.h",
     "mac/nswindow_frame_controls.mm",
     "mac/scoped_cocoa_disable_screen_updates.h",
+    "native_pixmap_handle_ozone.h",
     "native_widget_types.h",
     "nine_image_painter.cc",
     "nine_image_painter.h",
     "paint_throbber.cc",
     "paint_throbber.h",
     "path.cc",
     "path.h",
     "path_win.cc",
     "path_win.h",
     "path_x11.cc",
@@ skipping 464 matching lines @@
 if (is_android) {
   generate_jni("gfx_jni_headers") {
     sources = [
       "../android/java/src/org/chromium/ui/gfx/BitmapHelper.java",
       "../android/java/src/org/chromium/ui/gfx/DeviceDisplayInfo.java",
       "../android/java/src/org/chromium/ui/gfx/ViewConfigurationHelper.java",
     ]
     jni_package = "gfx"
   }
 }