Introduce ThreadedInputConnection behind a switch

content/public/android/javatests/src/org/chromium/content/browser/input/ImeTestUtils.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 android.os.Handler;
+import android.os.Looper;
+
+import java.util.concurrent.Callable;
+import java.util.concurrent.FutureTask;
+import java.util.concurrent.TimeUnit;
+
+/**
+ * Utilities for testing IME (input method editor).
+ */
+public class ImeTestUtils {
+    private static final long MAX_WAIT_TIME_MILLIS = 5000;
+
+    public static <T> T runBlockingOnHandlerNoException(Handler handler, Callable<T> callable) {
+        try {
+            return runBlockingOnHandler(handler, callable, MAX_WAIT_TIME_MILLIS);
+        } catch (Exception e) {
+            throw new RuntimeException("Error occured waiting for callable", e);
+        }
+    }
+
+    public static <T> T runBlockingOnHandler(Handler handler, Callable<T> callable)
+            throws Exception {
+        return runBlockingOnHandler(handler, callable, MAX_WAIT_TIME_MILLIS);
+    }
+
+    public static <T> T runBlockingOnHandler(
+            Handler handler, Callable<T> callable, long waitTimeMillis) throws Exception {
+        if (handler.getLooper() == Looper.myLooper()) {
+            return callable.call();
+        } else {
+            FutureTask<T> task = new FutureTask<T>(callable);
+            handler.post(task);
+            return task.get(waitTimeMillis, TimeUnit.MILLISECONDS);
+        }
+    }
+}