Add translate client mock.

components/translate/core/browser/mock_translate_client.cc

Index: components/translate/core/browser/mock_translate_client.cc
diff --git a/components/translate/core/browser/mock_translate_client.cc b/components/translate/core/browser/mock_translate_client.cc
new file mode 100644
index 0000000000000000000000000000000000000000..f517155a41a149cc7110129a996429e203b5b7fd
--- /dev/null
+++ b/components/translate/core/browser/mock_translate_client.cc
@@ -0,0 +1,41 @@
+// 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 <memory>
+
+#include "components/translate/core/browser/mock_translate_client.h"
+#include "components/translate/core/browser/translate_prefs.h"
+
+namespace translate {
+
+namespace testing {
+
+#if defined(OS_CHROMEOS)
+const char* preferred_languages_prefs = "settings.language.preferred_languages";
+#else
+const char* preferred_languages_prefs = nullptr;
+#endif
+const char* accept_languages_prefs = "intl.accept_languages";
+
+MockTranslateClient::MockTranslateClient(TranslateDriver* driver,
+                                         PrefService* prefs)
+    : driver_(driver), prefs_(prefs) {}
+
+MockTranslateClient::~MockTranslateClient() {}
+
+TranslateDriver* MockTranslateClient::GetTranslateDriver() {
+  return driver_;
+}
+
+PrefService* MockTranslateClient::GetPrefs() {
+  return prefs_;
+}
+
+std::unique_ptr<TranslatePrefs> MockTranslateClient::GetTranslatePrefs() {
+  return base::MakeUnique<TranslatePrefs>(prefs_, accept_languages_prefs,
+                                          preferred_languages_prefs);
+}
+
+}  // namespace testing
+}  // namespace translate