[remoting][FTL] Implement FtlDeviceIdProviderIos

This CL provides an FtlDeviceIdProvider implementation for the iOS
client, which generates the device ID from identifierForVendor:

https://developer.apple.com/documentation/uikit/uidevice/1620059-identifierforvendor?language=objc

Bug: 954594
Change-Id: Ieb5c373d66d17751294754c1674e86b8c7cb4ed3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1575116
Commit-Queue: Yuwei Huang <yuweih@chromium.org>
Reviewed-by: Joe Downing <joedow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#652671}

remoting/ios/facade/BUILD.gn

@@ -8,6 +8,8 @@ import("//remoting/build/config/remoting_build.gni")
 
 source_set("facade") {
   sources = [
+    "ftl_device_id_provider_ios.h",
+    "ftl_device_id_provider_ios.mm",
     "host_info.cc",
     "host_info.h",
     "host_list_fetcher.cc",
@@ -33,6 +35,7 @@ source_set("facade") {
     "//remoting/ios/domain",
     "//remoting/ios/persistence",
     "//remoting/resources",
+    "//remoting/signaling",
     "//ui/base",
   ]
 

remoting/ios/facade/ftl_device_id_provider_ios.h

+// Copyright 2019 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.
+
+#ifndef REMOTING_IOS_FACADE_FTL_DEVICE_ID_PROVIDER_IOS_H_
+#define REMOTING_IOS_FACADE_FTL_DEVICE_ID_PROVIDER_IOS_H_
+
+#include <string>
+
+#include "base/macros.h"
+#include "remoting/signaling/ftl_device_id_provider.h"
+
+namespace remoting {
+
+class FtlDeviceIdProviderIos final : public FtlDeviceIdProvider {
+ public:
+  FtlDeviceIdProviderIos();
+  ~FtlDeviceIdProviderIos() override;
+
+  ftl::DeviceId GetDeviceId() override;
+
+ private:
+  ftl::DeviceId device_id_;
+
+  DISALLOW_COPY_AND_ASSIGN(FtlDeviceIdProviderIos);
+};
+
+}  // namespace remoting
+
+#endif  // REMOTING_IOS_FACADE_FTL_DEVICE_ID_PROVIDER_IOS_H_

remoting/ios/facade/ftl_device_id_provider_ios.mm

+// Copyright 2019 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.
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+#include "remoting/ios/facade/ftl_device_id_provider_ios.h"
+
+#import <UIKit/UIKit.h>
+
+#include "base/strings/sys_string_conversions.h"
+
+namespace remoting {
+
+FtlDeviceIdProviderIos::FtlDeviceIdProviderIos() {
+  std::string vendor_id = base::SysNSStringToUTF8(
+      UIDevice.currentDevice.identifierForVendor.UUIDString);
+  device_id_.set_type(ftl::DeviceIdType_Type_IOS_VENDOR_ID);
+  device_id_.set_id(vendor_id);
+}
+
+FtlDeviceIdProviderIos::~FtlDeviceIdProviderIos() = default;
+
+ftl::DeviceId FtlDeviceIdProviderIos::GetDeviceId() {
+  return device_id_;
+}
+
+}  // namespace remoting