Implement touch events for site-isolation.

chrome/browser/apps/guest_view/web_view_browsertest.cc

 // Copyright 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.
 
 #include <queue>
 #include <utility>
 
 #include "base/location.h"
 #include "base/macros.h"
 #include "base/path_service.h"
@@ skipping 873 matching lines @@
   // platform_app for this test.
   LoadAppWithGuest("web_view/visibility_changed");
 
   ExtensionTestMessageListener launched_again_listener("WebViewTest.LAUNCHED",
                                                        false);
   GetEmbedderWebContents()->GetController().Reload(false);
   ASSERT_TRUE(launched_again_listener.WaitUntilSatisfied());
 }
 
 IN_PROC_BROWSER_TEST_P(WebViewTest, AcceptTouchEvents) {
-  // TODO(lfg): Fix touch events for OOPIF-based webview.
-  // https://crbug.com/581892
+  // This test only makes sense for non-OOPIF WebView, since with
+  // UseCrossProcessFramesForGuests() events are routed directly to the
+  // guest, so the embedder does not need to know about the installation of
+  // touch handlers.
   if (content::BrowserPluginGuestMode::UseCrossProcessFramesForGuests())
     return;
 
   LoadAppWithGuest("web_view/accept_touch_events");
 
   content::RenderViewHost* embedder_rvh =
       GetEmbedderWebContents()->GetRenderViewHost();
 
   bool embedder_has_touch_handler =
       content::RenderViewHostTester::HasTouchEventHandler(embedder_rvh);
@@ skipping 2209 matching lines @@
   // 4 tasks expected. The order is arbitrary.
   // Tab: about:blank,
   // Background Page: <webview> task manager test,
   // App: <webview> task manager test,
   // Webview: WebViewed test content.
   EXPECT_EQ(4U, task_manager.tasks().size());
   EXPECT_TRUE(HasExpectedGuestTask(task_manager, guest_contents));
 }
 
 #endif  // defined(ENABLE_TASK_MANAGER)