[Autofill/Autocomplete Feature] Substring matching instead of prefix matching.

components/autofill/core/common/autofill_util.h

Index: components/autofill/core/common/autofill_util.h
diff --git a/components/autofill/core/common/autofill_util.h b/components/autofill/core/common/autofill_util.h
new file mode 100644
index 0000000000000000000000000000000000000000..015c9b46cf3b7fa94a60865658ed673491a1c793
--- /dev/null
+++ b/components/autofill/core/common/autofill_util.h
@@ -0,0 +1,34 @@
+// Copyright 2015 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_AUTOFILL_CORE_COMMON_AUTOFILL_UTIL_H_
+#define COMPONENTS_AUTOFILL_CORE_COMMON_AUTOFILL_UTIL_H_
+
+#include "base/strings/string16.h"
+
+namespace autofill {
+
+// Returns |true| when command line switch
+// |kEnableSuggestionsWithSubStringMatch| is on; otherwise |false|.
+bool IsFeatureSubStringMatchEnabled();
+
+// Returns |true| if a token within |field_suggestion| starts with
+// |field_contents|; otherwise |false|. By default it performs case insensitive
+// search. Caller can perform case sensitive search by explicitly passing |true|
+// as |case_sensitive| parameter to this API.
+bool HasTokoneStartsWith(const base::string16& field_suggestion,

[vabr (Chromium), 2015/03/23 14:17:33]

Apart from the typo (Tokone), the name is still a bit cryptic -- it is not clear
what a token means in this context.

[Pritam Nikam, 2015/03/24 11:39:36]

Done.

+                         const base::string16& field_contents,
+                         bool case_sensitive = false);
+
+// Returns |field_contents|'s offset within the |field_suggestion| on successful
+// match and compute the selection range's |start| and |end| indices; otherwise
+// returns |base::string16::npos|.
+base::string16::size_type ComputeRange(const base::string16& field_suggestion,
+                                       const base::string16& field_contents,
+                                       size_t* start,
+                                       size_t* end);
+
+}  // namespace autofill
+
+#endif  // COMPONENTS_AUTOFILL_CORE_COMMON_AUTOFILL_UTIL_H_