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

ui/ozone/platform/drm/ozone_platform_drm.cc

Index: ui/ozone/platform/drm/ozone_platform_drm.cc
diff --git a/ui/ozone/platform/drm/ozone_platform_drm.cc b/ui/ozone/platform/drm/ozone_platform_drm.cc
index c0a6ce7bcae579e54ea8533cc72fc9f8d09bc896..59170f100b4772f0e00927d6886edc66b0370281 100644
--- a/ui/ozone/platform/drm/ozone_platform_drm.cc
+++ b/ui/ozone/platform/drm/ozone_platform_drm.cc
@@ -28,6 +28,7 @@
 #include "ui/ozone/platform/drm/host/drm_overlay_manager.h"
 #include "ui/ozone/platform/drm/host/drm_window_host.h"
 #include "ui/ozone/platform/drm/host/drm_window_host_manager.h"
+#include "ui/ozone/public/native_pixmap_client.h"
 #include "ui/ozone/public/ozone_gpu_test_helper.h"
 #include "ui/ozone/public/ozone_platform.h"
 
@@ -154,6 +155,15 @@ class OzonePlatformDrm : public OzonePlatform {
   DISALLOW_COPY_AND_ASSIGN(OzonePlatformDrm);
 };
 
+class NativePixmapClientDrm : public NativePixmapClient {
+ public:
+  NativePixmapClientDrm() {}
+  ~NativePixmapClientDrm() override {}
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(NativePixmapClientDrm);
+};
+
 }  // namespace
 
 OzonePlatform* CreateOzonePlatformDri() {
@@ -164,4 +174,12 @@ OzonePlatform* CreateOzonePlatformDrm() {
   return new OzonePlatformDrm;
 }
 
+NativePixmapClient* CreateNativePixmapClientDri() {
+  return new NativePixmapClientDrm;
+}
+
+NativePixmapClient* CreateNativePixmapClientDrm() {
+  return new NativePixmapClientDrm;
+}
+
 }  // namespace ui