Add a test runner for android_webview.

content/public/android/javatests/src/org/chromium/content/browser/test/CallbackHelper.java

Index: content/public/android/javatests/src/org/chromium/content/browser/test/CallbackHelper.java
diff --git a/content/public/android/javatests/src/org/chromium/content/browser/test/CallbackHelper.java b/content/public/android/javatests/src/org/chromium/content/browser/test/CallbackHelper.java
new file mode 100644
index 0000000000000000000000000000000000000000..dd734e611ffb848752de6f24801f0627fa7ac3dd
--- /dev/null
+++ b/content/public/android/javatests/src/org/chromium/content/browser/test/CallbackHelper.java
@@ -0,0 +1,93 @@
+// Copyright (c) 2012 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.test;
+
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.TimeoutException;
+
+/**
+ * A helper class for listening to callbacks.
+ */
+public class CallbackHelper {
+    private Object mLock = new Object();
+    protected int mCallCount = 0;
+
+    /**
+     * Gets the number of times the callback has been called.
+     *
+     * The call count can be used with the waitForCallback() method, indicating a point
+     * in time after which the caller wishes to record calls to the callback.
+     *
+     * In order to wait for a callback caused by X, the call count should be obtained
+     * before X occurs.
+     *
+     * NOTE: any call to the callback that occurs after the call count is obtained
+     * will result in the corresponding wait call to resume execution. The call count
+     * is intended to 'catch' callbacks that occur after X but before waitForCallback()
+     * is called.
+     */
+    public int getCallCount() {
+        synchronized(mLock) {
+            return mCallCount;
+        }
+    }
+
+    /**
+     * Blocks until the callback is called the specified number of
+     * times or throws an exception if we exceeded the specified time frame.
+     *
+     * This will wait for a callback to be called a specified number of times after
+     * the point in time at which the call count was obtained.  The method will return
+     * immediately if a call occurred the specified number of times after the
+     * call count was obtained but before the method was called, otherwise the method will
+     * block until the specified call count is reached.
+     *
+     * @param currentCallCount the value obtained by calling getCallCount().
+     * @param numberOfCallsToWaitFor number of calls (counting since
+     *                               currentCallCount was obtained) that we will wait for.
+     * @param timeout timeout value. We will wait the specified amount of time for a single
+     *                callback to occur so the method call may block up to
+     *                <code>numberOfCallsToWaitFor * timeout</code> units.
+     * @param unit timeout unit.
+     * @throws InterruptedException
+     * @throws TimeoutException Thrown if the method times out before onPageFinished is called.
+     */
+    public void waitForCallback(int currentCallCount, int numberOfCallsToWaitFor, long timeout,
+            TimeUnit unit) throws InterruptedException, TimeoutException {
+        assert mCallCount >= currentCallCount;
+        assert numberOfCallsToWaitFor > 0;
+        synchronized(mLock) {
+            int callCountWhenDoneWaiting = currentCallCount + numberOfCallsToWaitFor;
+            while (callCountWhenDoneWaiting > mCallCount) {
+                int callCountBeforeWait = mCallCount;
+                wait(unit.toMillis(timeout));
+                if (callCountBeforeWait == mCallCount) {
+                    throw new TimeoutException("waitForCallback timed out!");
+                }
+            }
+        }
+    }
+
+    public void waitForCallback(int currentCallCount, int numberOfCallsToWaitFor)
+            throws InterruptedException, TimeoutException {
+        waitForCallback(currentCallCount, numberOfCallsToWaitFor,
+                TestContentViewClient.WAIT_TIMEOUT_SECONDS, TimeUnit.SECONDS);
+    }
+
+    public void waitForCallback(int currentCallCount)
+            throws InterruptedException, TimeoutException {
+        waitForCallback(currentCallCount, 1);
+    }
+
+    /**
+     * Should be called when the callback associated with this helper object is called.
+     */
+    public void notifyCalled() {
+        synchronized(mLock) {
+            mCallCount++;
+            notifyAll();
+        }
+    }
+}