add paths_win.cc to FML (flutter#3563)

* add paths_win.cc to FML

* update licenses

fml/BUILD.gn

@@ -95,6 +95,7 @@ source_set("fml") {
     sources += [
       "platform/win/message_loop_win.cc",
       "platform/win/message_loop_win.h",
+      "platform/win/paths_win.cc",
     ]
   }
 }

fml/platform/win/paths_win.cc

@@ -0,0 +1,28 @@
+// Copyright 2017 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 "flutter/fml/paths.h"
+
+#include <windows.h>
+
+#include "lib/ftl/files/path.h"
+
+namespace fml {
+namespace paths {
+
+std::pair<bool, std::string> GetExecutableDirectoryPath() {
+  HMODULE module = GetModuleHandle(NULL);
+  if (module == NULL) {
+    return {false, ""};
+  }
+  char path[MAX_PATH];
+  DWORD read_size = GetModuleFileNameA(module, path, MAX_PATH);
+  if (read_size == 0 || read_size == MAX_PATH) {
+    return {false, ""};
+  }
+  return {true, files::GetDirectoryName(std::string{path, read_size})};
+}
+
+}  // namespace paths
+}  // namespace fml

travis/licenses_golden/licenses_flutter

@@ -1401,6 +1401,7 @@ FILE: ../../../flutter/fml/platform/linux/timerfd.cc
 FILE: ../../../flutter/fml/platform/linux/timerfd.h
 FILE: ../../../flutter/fml/platform/win/message_loop_win.cc
 FILE: ../../../flutter/fml/platform/win/message_loop_win.h
+FILE: ../../../flutter/fml/platform/win/paths_win.cc
 FILE: ../../../flutter/fml/task_observer.h
 FILE: ../../../flutter/fml/task_runner.cc
 FILE: ../../../flutter/fml/task_runner.h