Mojo C++ bindings: support mapping T and T? differently.

components/arc/test/fake_app_instance.cc

 // 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.
 
 #include "components/arc/test/fake_app_instance.h"
 
 #include <stdint.h>
 
 #include <string>
 #include <vector>
@@ skipping 29 matching lines @@
 FakeAppInstance::FakeAppInstance(mojom::AppHost* app_host)
     : app_host_(app_host) {}
 FakeAppInstance::~FakeAppInstance() {}
 
 void FakeAppInstance::RefreshAppList() {
   ++refresh_app_list_count_;
 }
 
 void FakeAppInstance::LaunchApp(const mojo::String& package_name,
                                 const mojo::String& activity,
-                                const gfx::Rect& dimension) {
+                                const base::Optional<gfx::Rect>& dimension) {
   launch_requests_.push_back(new Request(package_name, activity));
 }
 
 void FakeAppInstance::RequestAppIcon(const mojo::String& package_name,
                                      const mojo::String& activity,
                                      mojom::ScaleFactor scale_factor) {
   icon_requests_.push_back(
       new IconRequest(package_name, activity, scale_factor));
 }
 
@@ skipping 139 matching lines @@
     const mojo::String& package_name,
     mojom::ShowPackageInfoPage page,
     const gfx::Rect& dimension_on_screen) {}
 
 void FakeAppInstance::SetNotificationsEnabled(const mojo::String& package_name,
                                               bool enabled) {
 }
 
 void FakeAppInstance::InstallPackage(mojom::ArcPackageInfoPtr arcPackageInfo) {}
 
-void FakeAppInstance::LaunchIntent(const mojo::String& intent_uri,
-                                   const gfx::Rect& dimension_on_screen) {
+void FakeAppInstance::LaunchIntent(
+    const mojo::String& intent_uri,
+    const base::Optional<gfx::Rect>& dimension_on_screen) {
   launch_intents_.push_back(new mojo::String(intent_uri));
 }
 
 void FakeAppInstance::RequestIcon(const mojo::String& icon_resource_id,
                                   arc::mojom::ScaleFactor scale_factor,
                                   const RequestIconCallback& callback) {
   shortcut_icon_requests_.push_back(
       new ShortcutIconRequest(icon_resource_id, scale_factor));
 
   std::string png_data_as_string;
   if (GetFakeIcon(scale_factor, &png_data_as_string)) {
     callback.Run(mojo::Array<uint8_t>::From(png_data_as_string));
   }
 }
 
 void FakeAppInstance::RemoveCachedIcon(const mojo::String& icon_resource_id) {}
 
 }  // namespace arc