Making a way to create thread with a Java Looper for Android

base/android/java/src/org/chromium/base/JavaHandlerThread.java

+// Copyright (c) 2013 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 android.os.HandlerThread;
+import android.os.Looper;
+import android.os.Message;
+
+/**
+ * This class is an internal detail of the native counterpart.
+ * It is instantiated and owned by the native object.
+ */
+@JNINamespace("base::android")
+class JavaHandlerThread {
+    final HandlerThread mThread;
+
+    private JavaHandlerThread(String name) {
+        mThread = new HandlerThread(name);
+    }
+
+    @CalledByNative
+    private static JavaHandlerThread create(String name) {
+        return new JavaHandlerThread(name);
+    }
+
+    @CalledByNative
+    private void start(final int nativeThread, final int nativeEvent) {
+        mThread.start();
+        new Handler(mThread.getLooper()).post(new Runnable() {
+            @Override
+            public void run() {
+                nativeInitializeThread(nativeThread, nativeEvent);
+            }
+        });
+    }
+
+    private native void nativeInitializeThread(int nativeJavaHandlerThread, int nativeEvent);
+}