Add a UI test for "Encoding" menu

chrome/browser/download/save_page_uitest.cc

Index: chrome/browser/download/save_page_uitest.cc
===================================================================
--- chrome/browser/download/save_page_uitest.cc	(revision 10924)
+++ chrome/browser/download/save_page_uitest.cc	(working copy)
@@ -20,35 +20,16 @@
  protected:
   SavePageTest() : UITest() {}
 
-  void CheckFile(const std::wstring& client_file,
-                 const std::wstring& server_file,
+  void CheckFile(const std::wstring& generated_file,
+                 const std::wstring& expect_result_file,
                  bool check_equal) {
-    bool exist = false;
-    for (int i = 0; i < 20; ++i) {
-      if (file_util::PathExists(client_file)) {
-        exist = true;
-        break;
-      }
-      Sleep(sleep_timeout_ms());
-    }
-    EXPECT_TRUE(exist);
+    std::wstring expect_result_filepath =
+        UITest::GetTestFilePath(kTestDir, expect_result_file);
 
-    if (check_equal) {
-      std::wstring server_file_name;
-      ASSERT_TRUE(PathService::Get(chrome::DIR_TEST_DATA,
-                                   &server_file_name));
-      server_file_name += L"\\" + kTestDir + L"\\" + server_file;
-      ASSERT_TRUE(file_util::PathExists(server_file_name));
-
-      int64 client_file_size = 0;
-      int64 server_file_size = 0;
-      EXPECT_TRUE(file_util::GetFileSize(client_file, &client_file_size));
-      EXPECT_TRUE(file_util::GetFileSize(server_file_name, &server_file_size));
-      EXPECT_EQ(client_file_size, server_file_size);
-      EXPECT_TRUE(file_util::ContentsEqual(client_file, server_file_name));
-    }
-
-    EXPECT_TRUE(DieFileDie(client_file, false));
+    ASSERT_TRUE(file_util::PathExists(expect_result_filepath));
+    WaitForGeneratedFileAndCheck(generated_file,
+                                 expect_result_filepath,
+                                 check_equal, true);
   }
 
   virtual void SetUp() {