android: Java-based launcher thread

base/test/android/java/src/org/chromium/base/JavaHandlerThreadTest.java

Index: base/test/android/java/src/org/chromium/base/JavaHandlerThreadTest.java
diff --git a/base/test/android/java/src/org/chromium/base/JavaHandlerThreadTest.java b/base/test/android/java/src/org/chromium/base/JavaHandlerThreadTest.java
new file mode 100644
index 0000000000000000000000000000000000000000..e516000b5e29e549af0d1233f8a4e508e1021537
--- /dev/null
+++ b/base/test/android/java/src/org/chromium/base/JavaHandlerThreadTest.java
@@ -0,0 +1,48 @@
+// Copyright 2017 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.base;
+
+import android.os.Handler;
+
+import org.chromium.base.annotations.CalledByNative;
+import org.chromium.base.annotations.JNINamespace;
+
+@JNINamespace("base")
+class JavaHandlerThreadTest {
+    private static boolean sTaskExecuted;
+    // This is executed as part of base_unittests. This tests that JavaHandlerThread can be used
+    // by itself without attaching to its native peer.
+    @CalledByNative
+    private static JavaHandlerThread testAndGetJavaHandlerThread() {
+        sTaskExecuted = false;
+        final Object lock = new Object();
+        Runnable runnable = new Runnable() {
+            @Override
+            public void run() {
+                synchronized (lock) {
+                    sTaskExecuted = true;
+                    lock.notifyAll();
+                }
+            }
+        };
+
+        JavaHandlerThread thread = new JavaHandlerThread("base_unittests_java");
+        thread.maybeStart();
+
+        Handler handler = new Handler(thread.getLooper());
+        handler.post(runnable);
+        synchronized (lock) {
+            while (!sTaskExecuted) {
+                try {
+                    lock.wait();
+                } catch (InterruptedException e) {
+                    // ignore interrupts
+                }
+            }
+        }
+
+        return thread;
+    }
+}