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

ui/ozone/platform/caca/ozone_platform_caca.cc

Index: ui/ozone/platform/caca/ozone_platform_caca.cc
diff --git a/ui/ozone/platform/caca/ozone_platform_caca.cc b/ui/ozone/platform/caca/ozone_platform_caca.cc
index fdfebe22402d4d149a200af974b1767513610402..728c66f5092da6dba9a25077171921a7029ad2a5 100644
--- a/ui/ozone/platform/caca/ozone_platform_caca.cc
+++ b/ui/ozone/platform/caca/ozone_platform_caca.cc
@@ -15,6 +15,7 @@
 #include "ui/ozone/public/gpu_platform_support.h"
 #include "ui/ozone/public/gpu_platform_support_host.h"
 #include "ui/ozone/public/input_controller.h"
+#include "ui/ozone/public/native_pixmap_manager.h"
 #include "ui/ozone/public/ozone_platform.h"
 #include "ui/ozone/public/system_input_injector.h"
 
@@ -95,4 +96,8 @@ OzonePlatform* CreateOzonePlatformCaca() {
   return new OzonePlatformCaca;
 }
 
+NativePixmapManager* CreateNativePixmapManagerCaca() {
+  return CreateStubNativePixmapManager();
+}
+
 }  // namespace ui