Introduce ThreadedInputConnection behind a switch

content/public/android/junit/src/org/chromium/content/browser/input/TextInputStateTest.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 static org.junit.Assert.assertEquals;
+
+import org.chromium.base.test.util.Feature;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.BlockJUnit4ClassRunner;
+
+/**
+ * Unit tests for {@TextInputState}.
+ */
+@RunWith(BlockJUnit4ClassRunner.class)
+public class TextInputStateTest {
+    @Test
+    @Feature({"TextInput"})
+    public void testEmptySelection() {
+        TextInputState state =
+                new TextInputState("hello", new Range(3, 3), new Range(-1, -1), false, true);
+        assertEquals("lo", state.getTextAfterSelection(3));
+        assertEquals("lo", state.getTextAfterSelection(2));
+        assertEquals("", state.getTextAfterSelection(0));
+        assertEquals("hel", state.getTextBeforeSelection(3));
+        assertEquals("el", state.getTextBeforeSelection(2));
+        assertEquals("", state.getTextBeforeSelection(0));
+        assertEquals("", state.getSelectedText());
+    }
+
+    @Test
+    @Feature({"TextInput"})
+    public void testNonEmptySelection() {
+        TextInputState state =
+                new TextInputState("hello", new Range(3, 4), new Range(3, 4), false, true);
+        assertEquals("hel", state.getTextBeforeSelection(4));
+        assertEquals("hel", state.getTextBeforeSelection(3));
+        assertEquals("", state.getTextBeforeSelection(0));
+        assertEquals("o", state.getTextAfterSelection(2));
+        assertEquals("o", state.getTextAfterSelection(1));
+        assertEquals("", state.getTextAfterSelection(0));
+        assertEquals("l", state.getSelectedText());
+    }
+}