Fix the MessageLoop type in case more than one ozone platform is built

ui/ozone/public/ozone_platform.cc

Index: ui/ozone/public/ozone_platform.cc
diff --git a/ui/ozone/public/ozone_platform.cc b/ui/ozone/public/ozone_platform.cc
index 6f25a1b12ead6e06b2230a137bee70503b79d28c..73d51c98cbde1b3685bde8af638403e7ad7c6e07 100644
--- a/ui/ozone/public/ozone_platform.cc
+++ b/ui/ozone/public/ozone_platform.cc
@@ -94,6 +94,7 @@ OzonePlatform* OzonePlatform::instance_;
 void OzonePlatform::InitializeUI(const InitParams& args) {
   InitializeUI();
 }
+
 void OzonePlatform::InitializeGPU(const InitParams& args) {
   InitializeGPU();
 }
@@ -101,6 +102,11 @@ void OzonePlatform::InitializeGPU(const InitParams& args) {
 IPC::MessageFilter* OzonePlatform::GetGpuMessageFilter() {
   return nullptr;
 }
+
+base::MessageLoop::Type OzonePlatform::GetMessageLoopTypeForGpu() {
+  return base::MessageLoop::TYPE_DEFAULT;
+}
+
 void OzonePlatform::AddInterfaces(
     service_manager::InterfaceRegistry* registry) {}