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 372 matching lines @@
     }
   }
 
   if (use_x11) {
     deps += [ "//ui/gfx/x" ]
     configs += [ "//build/config/linux:x11" ]
   } else {
     sources -= [ "path_x11.cc" ]
   }
 
+  if (use_ozone) {
+    sources += [ "native_pixmap_handle_ozone.h" ]
+  }
+
   if (use_cairo) {
     configs += [ "//build/config/linux:pangocairo" ]
   }
 }
 
 # GYP version: ui/gfx/gfx.gyp:aggregate_vector_icons
 action("aggregate_vector_icons") {
   script = "vector_icons/aggregate_vector_icons.py"
   sources = [
     "vector_icons/account_child_invert.icon",
@@ skipping 223 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"
   }
 }