Escape backslash (\x5C) for string value of search query.

chrome/browser/google_apis/drive_api_util_unittest.cc

 // Copyright 2013 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 "chrome/browser/google_apis/drive_api_util.h"
 
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace google_apis {
 namespace drive {
 namespace util {
 
 TEST(DriveApiUtilTest, EscapeQueryStringValue) {
   EXPECT_EQ("abcde", EscapeQueryStringValue("abcde"));
   EXPECT_EQ("\\'", EscapeQueryStringValue("'"));
   EXPECT_EQ("\\'abcde\\'", EscapeQueryStringValue("'abcde'"));
+  EXPECT_EQ("\\\\", EscapeQueryStringValue("\\"));
+  EXPECT_EQ("\\\\\\'", EscapeQueryStringValue("\\'"));
 }
 
 }  // namespace util
 }  // namespace drive
 }  // namespace google_apis