Introduce ThreadedInputConnection behind a switch

content/public/android/java/src/org/chromium/content/browser/input/Range.java

+// Copyright 2016 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.
+
+package org.chromium.content.browser.input;
+
+import org.chromium.base.VisibleForTesting;
+
+/**
+ * A simple class to set start and end in int type.
+ * TODO(changwan): replace this with android.util.Range when the default SDK
+ * version becomes 21 or higher.
+ */
+public class Range {
+    private int mStart;
+    private int mEnd;
+
+    public Range(int start, int end) {
+        set(start, end);
+    }
+
+    public int start() {
+        return mStart;
+    }
+
+    public int end() {
+        return mEnd;
+    }
+
+    @VisibleForTesting
+    public void set(int start, int end) {
+        mStart = Math.min(start, end);
+        mEnd = Math.max(start, end);
+    }
+
+    public void clamp(int start, int end) {
+        mStart = Math.min(Math.max(mStart, start), end);
+        mEnd = Math.max(Math.min(mEnd, end), start);
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (!(o instanceof Range)) return false;
+        if (o == this) return true;
+        Range r = (Range) o;
+        return mStart == r.mStart && mEnd == r.mEnd;
+    }
+
+    @Override
+    public int hashCode() {
+        return 11 * mStart + 31 * mEnd;
+    }
+
+    @Override
+    public String toString() {
+        return "[ " + mStart + ", " + mEnd + " ]";
+    }
+}