Revert removal of grammar checking and marking code

components/test_runner/mock_grammar_check.h

Index: components/test_runner/mock_grammar_check.h
diff --git a/components/test_runner/mock_grammar_check.h b/components/test_runner/mock_grammar_check.h
new file mode 100644
index 0000000000000000000000000000000000000000..2642141d99204289aef2e479a93b7b5f9ed641f2
--- /dev/null
+++ b/components/test_runner/mock_grammar_check.h
@@ -0,0 +1,30 @@
+// 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.
+
+#ifndef COMPONENTS_TEST_RUNNER_MOCK_GRAMMAR_CHECK_H_
+#define COMPONENTS_TEST_RUNNER_MOCK_GRAMMAR_CHECK_H_
+
+#include <vector>
+
+namespace blink {
+class WebString;
+struct WebTextCheckingResult;
+}
+
+namespace test_runner {
+
+// A mock implementation of a grammar-checker used for WebKit tests. This class
+// only implements the minimal functionarities required by WebKit tests, i.e.
+// this class just compares the given string with known grammar mistakes in
+// webkit tests and adds grammar markers on them. Even though this is sufficent
+// for webkit tests, this class is not suitable for any other usages.
+class MockGrammarCheck {
+ public:
+  static bool CheckGrammarOfString(const blink::WebString&,
+                                   std::vector<blink::WebTextCheckingResult>*);
+};
+
+}  // namespace test_runner
+
+#endif  // COMPONENTS_TEST_RUNNER_MOCK_GRAMMAR_CHECK_H_