fuchsia: add base_paths_fuchsia.cc

base/base_paths_fuchsia.cc

+// 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 "base/base_paths.h"
+
+#include "base/files/file_path.h"
+
+namespace base {
+
+bool PathProviderFuchsia(int key, FilePath* result) {
+  switch (key) {
+    case FILE_EXE:
+    case FILE_MODULE: {
+      // TODO(fuchsia): There's no API to retrieve this on Fuchsia currently.
+      // See https://crbug.com/726124.
+      *result = FilePath("/system/chrome");
+      return true;
+    }
+  }
+
+  return false;
+}
+
+}  // namespace base