views: Moves TextfieldController/TextRange into their own headers.

views/controls/textfield/text_range.cc

+// Copyright (c) 2011 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 "views/controls/textfield/text_range.h"
+
+#include <algorithm>
+
+namespace views {
+
+TextRange::TextRange()
+    : start_(0), end_(0) {
+}
+
+TextRange::TextRange(size_t start, size_t end)
+    : start_(start), end_(end) {
+}
+
+TextRange::TextRange(const TextRange& range)
+    : start_(range.start_), end_(range.end_) {
+}
+
+size_t TextRange::GetMin() const {
+  return std::min(start_, end_);
+}
+
+size_t TextRange::GetMax() const {
+  return std::max(start_, end_);
+}
+bool TextRange::EqualsIgnoringDirection(const TextRange& range) const {
+  return GetMin() == range.GetMin() && GetMax() == range.GetMax();
+}
+
+void TextRange::SetRange(size_t start, size_t end) {
+  start_ = start;
+  end_ = end;
+}
+
+}  // namespace views