check network connectivity in onPageTranslated callback.

components/translate/core/browser/mock_translate_driver.cc

Index: components/translate/core/browser/mock_translate_driver.cc
diff --git a/components/translate/core/browser/mock_translate_driver.cc b/components/translate/core/browser/mock_translate_driver.cc
index f537e77d6aa06e90eae1e34f97fbf78e5cf001b4..22de90a428ad49031b33e68669d2e69ef36dddf7 100644
--- a/components/translate/core/browser/mock_translate_driver.cc
+++ b/components/translate/core/browser/mock_translate_driver.cc
@@ -13,7 +13,14 @@ const std::string kHtmlMimeType = "text/html";
 MockTranslateDriver::MockTranslateDriver()
     : on_is_page_translated_changed_called_(false),
       on_translate_enabled_changed_called_(false),
-      language_state_(this) {
+      translate_page_is_called_(false),
+      language_state_(this) {}
+
+void MockTranslateDriver::TranslatePage(int page_seq_no,
+                                        const std::string& translate_script,
+                                        const std::string& source_lang,
+                                        const std::string& target_lang) {
+  translate_page_is_called_ = true;
 }
 
 void MockTranslateDriver::Reset() {