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

ui/ozone/platform/egltest/ozone_platform_egltest.cc

Index: ui/ozone/platform/egltest/ozone_platform_egltest.cc
diff --git a/ui/ozone/platform/egltest/ozone_platform_egltest.cc b/ui/ozone/platform/egltest/ozone_platform_egltest.cc
index 31f35a6e33f597ee27d6ba05ce9eaf9f9daef6c0..441d282605e775834dcb244007dea1dba07901c0 100644
--- a/ui/ozone/platform/egltest/ozone_platform_egltest.cc
+++ b/ui/ozone/platform/egltest/ozone_platform_egltest.cc
@@ -27,6 +27,7 @@
 #include "ui/ozone/public/cursor_factory_ozone.h"
 #include "ui/ozone/public/gpu_platform_support.h"
 #include "ui/ozone/public/gpu_platform_support_host.h"
+#include "ui/ozone/public/native_pixmap_client.h"
 #include "ui/ozone/public/ozone_platform.h"
 #include "ui/ozone/public/ozone_switches.h"
 #include "ui/ozone/public/surface_factory_ozone.h"
@@ -401,6 +402,15 @@ class OzonePlatformEgltest : public OzonePlatform {
   DISALLOW_COPY_AND_ASSIGN(OzonePlatformEgltest);
 };
 
+class NativePixmapClientEgltest : public NativePixmapClient {
+ public:
+  NativePixmapClientEgltest() {}
+  ~NativePixmapClientEgltest() override {}
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(NativePixmapClientEgltest);
+};
+
 }  // namespace
 
 OzonePlatform* CreateOzonePlatformEgltest() {
@@ -409,4 +419,8 @@ OzonePlatform* CreateOzonePlatformEgltest() {
   return platform;
 }
 
+NativePixmapClient* CreateNativePixmapClientEgltest() {
+  return new NativePixmapClientEgltest;
+}
+
 }  // namespace ui