[Android] Upstream the WebView find-in-page API implementation.

android_webview/javatests/src/org/chromium/android_webview/test/WebViewMixedFindApisTest.java

+// 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.android_webview.test;
+
+import android.test.suitebuilder.annotation.SmallTest;
+
+import org.chromium.base.test.Feature;
+
+/**
+ * Tests the mixed use of synchronous and asynchronous find-in-page APIs in WebView.
+ * Helps to spot race conditions or potential deadlocks caused by the renderer receiving
+ * asynchronous messages while synchronous requests are being processed.
+ */
+public class WebViewMixedFindApisTest extends WebViewFindApisTestBase {
+
+    @SmallTest
+    @Feature({"Android-WebView", "FindInPage"})
+    public void testAsyncFindOperationsMixedWithSyncFind() throws Throwable {
+        clearMatchesOnUiThread();
+        assertEquals(4, findAllSyncOnUiThread("wood"));
+        assertEquals(4, findAllSyncOnUiThread("wood"));
+        clearMatchesOnUiThread();
+        assertEquals(4, findAllAsyncOnUiThread("wood"));
+        assertEquals(3, findNextOnUiThread(true));
+        clearMatchesOnUiThread();
+        assertEquals(4, findAllSyncOnUiThread("wood"));
+    }
+
+    @SmallTest
+    @Feature({"Android-WebView", "FindInPage"})
+    public void testInterleavedFinds() throws Throwable {
+        assertEquals(4, findAllSyncOnUiThread("wood"));
+        assertEquals(4, findAllAsyncOnUiThread("wood"));
+        assertEquals(4, findAllSyncOnUiThread("wood"));
+        assertEquals(3, findNextOnUiThread(true));
+        assertEquals(4, findAllAsyncOnUiThread("wood"));
+        assertEquals(1, findNextOnUiThread(true));
+        assertEquals(4, findAllSyncOnUiThread("wood"));
+    }
+}