content_shell: Move BrowserTestSystemMessageHandler and use it in layout tests for Android

content/shell/android/browsertests_apk/src/org/chromium/content_browsertests_apk/BrowserTestSystemMessageHandler.java

Index: content/shell/android/browsertests_apk/src/org/chromium/content_browsertests_apk/BrowserTestSystemMessageHandler.java
diff --git a/content/shell/android/browsertests_apk/src/org/chromium/content_browsertests_apk/BrowserTestSystemMessageHandler.java b/content/shell/android/browsertests_apk/src/org/chromium/content_browsertests_apk/BrowserTestSystemMessageHandler.java
deleted file mode 100644
index 2ba7e9435c86bc67615bda67095797f6d32b4551..0000000000000000000000000000000000000000
--- a/content/shell/android/browsertests_apk/src/org/chromium/content_browsertests_apk/BrowserTestSystemMessageHandler.java
+++ /dev/null
@@ -1,128 +0,0 @@
-// 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.content_browsertests_apk;
-
-import android.os.Handler;
-import android.os.Looper;
-import android.os.Message;
-import android.os.MessageQueue;
-import android.util.Log;
-
-import org.chromium.base.CalledByNative;
-import org.chromium.base.JNINamespace;
-import java.lang.reflect.Method;
-import java.lang.reflect.Field;
-import java.lang.reflect.InvocationTargetException;
-
-/**
- * Handles processing messages in nested run loops.
- *
- * Android does not support nested message loops by default. While running
- * in nested mode, we use reflection to retreive messages from the MessageQueue
- * and dispatch them.
- */
-@JNINamespace("content")
-class BrowserTestSystemMessageHandler {
-    // See org.chromium.base.SystemMessageHandler for more message ids.
-    // The id here should not conflict with the ones in SystemMessageHandler.
-    private static final int QUIT_MESSAGE = 10;
-    private static final Handler mHandler = new Handler();
-
-    private BrowserTestSystemMessageHandler() {
-    }
-
-    /**
-     * Processes messages from the current MessageQueue till the queue becomes idle.
-     */
-    @SuppressWarnings("unused")
-    @CalledByNative
-    private boolean runNestedLoopTillIdle() {
-        boolean quitLoop = false;
-
-        MessageQueue queue = Looper.myQueue();
-        queue.addIdleHandler(new MessageQueue.IdleHandler() {
-            @Override
-            public boolean queueIdle() {
-                mHandler.sendMessage(mHandler.obtainMessage(QUIT_MESSAGE));
-                return false;
-            }
-        });
-
-        Class<?> messageQueueClazz = queue.getClass();
-        Method nextMethod = null;
-        try {
-            nextMethod = messageQueueClazz.getDeclaredMethod("next");
-        } catch (SecurityException e) {
-            e.printStackTrace();
-            return false;
-        } catch (NoSuchMethodException e) {
-            e.printStackTrace();
-            return false;
-        }
-        nextMethod.setAccessible(true);
-
-        while (!quitLoop) {
-            Message msg = null;
-            try {
-                msg = (Message)nextMethod.invoke(queue);
-            } catch (IllegalArgumentException e) {
-                e.printStackTrace();
-                return false;
-            } catch (IllegalAccessException e) {
-                e.printStackTrace();
-                return false;
-            } catch (InvocationTargetException e) {
-                e.printStackTrace();
-                return false;
-            }
-
-            if (msg != null) {
-                if (msg.what == QUIT_MESSAGE) {
-                    quitLoop = true;
-                }
-                Class messageClazz = msg.getClass();
-                Field targetFiled = null;
-                try {
-                    targetFiled = messageClazz.getDeclaredField("target");
-                } catch (SecurityException e) {
-                    e.printStackTrace();
-                    return false;
-                } catch (NoSuchFieldException e) {
-                    e.printStackTrace();
-                    return false;
-                }
-                targetFiled.setAccessible(true);
-
-                Handler target = null;
-                try {
-                    target = (Handler) targetFiled.get(msg);
-                } catch (IllegalArgumentException e) {
-                    e.printStackTrace();
-                    return false;
-                } catch (IllegalAccessException e) {
-                    e.printStackTrace();
-                    return false;
-                }
-
-                if (target == null) {
-                    // No target is a magic identifier for the quit message.
-                    quitLoop = true;
-                }
-
-                target.dispatchMessage(msg);
-                msg.recycle();
-            } else {
-                quitLoop = true;
-            }
-        }
-        return true;
-    }
-
-    @SuppressWarnings("unused")
-    @CalledByNative
-    private static BrowserTestSystemMessageHandler create() {
-        return new BrowserTestSystemMessageHandler();
-    }
-}