Revert removal of grammar checking and marking code

components/test_runner/mock_grammar_check.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 "components/test_runner/mock_grammar_check.h"
+
+#include <stddef.h>
+
+#include <algorithm>
+
+#include "base/logging.h"
+#include "base/macros.h"
+#include "components/test_runner/test_common.h"
+#include "third_party/WebKit/public/platform/WebString.h"
+#include "third_party/WebKit/public/web/WebTextCheckingResult.h"
+
+namespace test_runner {
+
+bool MockGrammarCheck::CheckGrammarOfString(
+    const blink::WebString& text,
+    std::vector<blink::WebTextCheckingResult>* results) {
+  DCHECK(results);
+  base::string16 string_text = text;
+  if (std::find_if(string_text.begin(), string_text.end(), IsASCIIAlpha) ==
+      string_text.end())
+    return true;
+
+  // Find matching grammatical errors from known ones. This function has to
+  // check all errors because the given text may consist of two or more
+  // sentences that have grammatical errors.
+  static const struct {
+    const char* text;
+    int location;
+    int length;
+  } kGrammarErrors[] = {
+        {"I have a issue.", 7, 1},
+        {"I have an grape.", 7, 2},
+        {"I have an kiwi.", 7, 2},
+        {"I have an muscat.", 7, 2},
+        {"You has the right.", 4, 3},
+        {"apple orange zz.", 0, 16},
+        {"apple zz orange.", 0, 16},
+        {"apple,zz,orange.", 0, 16},
+        {"orange,zz,apple.", 0, 16},
+        {"the the adlj adaasj sdklj. there there", 4, 3},
+        {"the the adlj adaasj sdklj. there there", 33, 5},
+        {"zz apple orange.", 0, 16},
+    };
+  for (size_t i = 0; i < arraysize(kGrammarErrors); ++i) {
+    size_t offset = 0;
+    base::string16 error(
+        kGrammarErrors[i].text,
+        kGrammarErrors[i].text + strlen(kGrammarErrors[i].text));
+    while ((offset = string_text.find(error, offset)) != base::string16::npos) {
+      results->push_back(
+          blink::WebTextCheckingResult(blink::WebTextDecorationTypeGrammar,
+                                       offset + kGrammarErrors[i].location,
+                                       kGrammarErrors[i].length));
+      offset += kGrammarErrors[i].length;
+    }
+  }
+  return false;
+}
+
+}  // namespace test_runner