ozone: Introduce ClientPixmap and ClientPixmapFactory for non-GPU processes.

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

Index: ui/ozone/platform/drm/gpu/native_pixmap_client_gbm.h
diff --git a/ui/ozone/platform/drm/gpu/native_pixmap_client_gbm.h b/ui/ozone/platform/drm/gpu/native_pixmap_client_gbm.h
new file mode 100644
index 0000000000000000000000000000000000000000..9b830b5b42839a95a29dad5800d225c3a25c5ace
--- /dev/null
+++ b/ui/ozone/platform/drm/gpu/native_pixmap_client_gbm.h
@@ -0,0 +1,17 @@
+// Copyright 2015 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.
+
+#ifndef UI_OZONE_PLATFORM_DRM_GPU_NATIVE_PIXMAP_CLIENT_GBM_H_
+#define UI_OZONE_PLATFORM_DRM_GPU_NATIVE_PIXMAP_CLIENT_GBM_H_
+
+namespace ui {
+
+class NativePixmapClient;
+
+// Constructor hook for use in constructor_list.cc
+NativePixmapClient* CreateNativePixmapClientGbm();
+
+}  // namespace ui
+
+#endif  // UI_OZONE_PLATFORM_DRM_GPU_NATIVE_PIXMAP_CLIENT_GBM_H_