Cross-process iframe accessibility.

content/browser/accessibility/frame_tree_accessibility_browsertest.cc

+// Copyright (c) 2014 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 "base/command_line.h"
+#include "base/logging.h"
+#include "content/browser/accessibility/browser_accessibility.h"
+#include "content/browser/accessibility/browser_accessibility_manager.h"
+#include "content/browser/frame_host/frame_tree.h"
+#include "content/browser/renderer_host/render_view_host_impl.h"
+#include "content/browser/web_contents/web_contents_impl.h"
+#include "content/port/browser/render_widget_host_view_port.h"
+#include "content/public/browser/browser_accessibility_state.h"
+#include "content/public/browser/notification_observer.h"
+#include "content/public/browser/notification_service.h"
+#include "content/public/browser/notification_types.h"
+#include "content/public/browser/web_contents.h"
+#include "content/public/browser/web_contents_observer.h"
+#include "content/public/common/content_switches.h"
+#include "content/public/common/url_constants.h"
+#include "content/public/test/browser_test_utils.h"
+#include "content/public/test/content_browser_test.h"
+#include "content/public/test/content_browser_test_utils.h"
+#include "content/public/test/test_utils.h"
+#include "content/shell/browser/shell.h"
+#include "content/test/accessibility_browser_test_utils.h"
+#include "net/dns/mock_host_resolver.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "url/gurl.h"
+
+namespace content {
+
+namespace {
+
+// TODO: share this with site_per_process_browsertest.cc
+class SitePerProcessWebContentsObserver: public WebContentsObserver {
+ public:
+  explicit SitePerProcessWebContentsObserver(WebContents* web_contents)
+      : WebContentsObserver(web_contents),
+        navigation_succeeded_(false) {}
+  virtual ~SitePerProcessWebContentsObserver() {}
+
+  virtual void DidStartProvisionalLoadForFrame(
+      int64 frame_id,
+      int64 parent_frame_id,
+      bool is_main_frame,
+      const GURL& validated_url,
+      bool is_error_page,
+      bool is_iframe_srcdoc,
+      RenderViewHost* render_view_host) OVERRIDE {
+    navigation_succeeded_ = false;
+  }
+
+  virtual void DidFailProvisionalLoad(
+      int64 frame_id,
+      const base::string16& frame_unique_name,
+      bool is_main_frame,
+      const GURL& validated_url,
+      int error_code,
+      const base::string16& error_description,
+      RenderViewHost* render_view_host) OVERRIDE {
+    navigation_url_ = validated_url;
+    navigation_succeeded_ = false;
+  }
+
+  virtual void DidCommitProvisionalLoadForFrame(
+      int64 frame_id,
+      const base::string16& frame_unique_name,
+      bool is_main_frame,
+      const GURL& url,
+      PageTransition transition_type,
+      RenderViewHost* render_view_host) OVERRIDE{
+    navigation_url_ = url;
+    navigation_succeeded_ = true;
+  }
+
+  const GURL& navigation_url() const {
+    return navigation_url_;
+  }
+
+  int navigation_succeeded() const { return navigation_succeeded_; }
+
+ private:
+  GURL navigation_url_;
+  bool navigation_succeeded_;
+
+  DISALLOW_COPY_AND_ASSIGN(SitePerProcessWebContentsObserver);
+};
+
+}  // namespace.
+
+class SitePerProcessAccessibilityBrowserTest : public ContentBrowserTest {
+ public:
+  SitePerProcessAccessibilityBrowserTest() {}
+
+ protected:
+  // Start at a data URL so each extra navigation creates a navigation entry.
+  // (The first navigation will silently be classified as AUTO_SUBFRAME.)
+  // TODO(creis): This won't be necessary when we can wait for LOAD_STOP.
+  void StartFrameAtDataURL() {
+    std::string data_url_script =
+      "var iframes = document.getElementById('test');iframes.src="
+      "'data:text/html,dataurl';";
+    ASSERT_TRUE(ExecuteScript(shell()->web_contents(), data_url_script));
+  }
+
+  // TODO: share this with site_per_process_browsertest.cc
+  bool NavigateIframeToURL(Shell* window,

[ncarter (slow), 2014/05/02 19:10:02]

One OKR we have for this quarter is to try to get to a world where a
same-process iframe test and a cross-process iframe tests only have to differ by
a couple lines of code. No doubt you can tell why this is a priority :)

The good news is that just this week, nasko landed
https://codereview.chromium.org/248963007 which has a NavigateFrameToURL method
that is used instead of this NavigateIFrameToURL -- you should just be able to
drop that in right now; it blocks until the load is complete, and I think it
should hopefully also make it so that you don't need the
SitePerProcessWebContentsObserver. Look at what happened to the browsertest in
that file, and I think you can just apply the same transformation here.

Another approach I hope to invest in (but haven't gotten to yet) is an easier,
redirect-based trick so that you can just specify cross-site frames in test
.html by tweaking the URL. That's detailed here:
https://groups.google.com/a/chromium.org/forum/#!topic/site-isolation-dev/VID...

+                           const GURL& url,
+                           std::string iframe_id) {
+    // TODO(creis): This should wait for LOAD_STOP, but cross-site subframe
+    // navigations generate extra DidStartLoading and DidStopLoading messages.
+    // Until we replace swappedout:// with frame proxies, we need to listen for
+    // something else.  For now, we trigger NEW_SUBFRAME navigations and listen
+    // for commit.
+    std::string script = base::StringPrintf(
+        "setTimeout(\""
+        "var iframes = document.getElementById('%s');iframes.src='%s';"
+        "\",0)",
+        iframe_id.c_str(), url.spec().c_str());
+    WindowedNotificationObserver load_observer(
+        NOTIFICATION_NAV_ENTRY_COMMITTED,
+        Source<NavigationController>(
+            &window->web_contents()->GetController()));
+    bool result = ExecuteScript(window->web_contents(), script);
+    load_observer.Wait();
+    return result;
+  }
+
+  virtual void SetUpCommandLine(CommandLine* command_line) OVERRIDE {
+    command_line->AppendSwitch(switches::kSitePerProcess);
+  }
+};
+
+IN_PROC_BROWSER_TEST_F(SitePerProcessAccessibilityBrowserTest,
+    CrossSiteIframeAccessibility) {
+  // Enable full accessibility for all current and future RenderWidgetHosts.
+  BrowserAccessibilityState::GetInstance()->EnableAccessibility();
+
+  AccessibilityNotificationWaiter accessibility_waiter(
+      shell(), AccessibilityModeComplete,
+      ui::AX_EVENT_LOAD_COMPLETE);
+
+  host_resolver()->AddRule("*", "127.0.0.1");
+  ASSERT_TRUE(test_server()->Start());
+  GURL main_url(test_server()->GetURL("files/site_per_process_main.html"));
+  NavigateToURL(shell(), main_url);
+
+  StartFrameAtDataURL();
+
+  SitePerProcessWebContentsObserver observer(shell()->web_contents());
+
+  // TODO: share this with site_per_process_browsertest.cc
+
+  // Load same-site page into iframe.
+  GURL http_url(test_server()->GetURL("files/title1.html"));
+  EXPECT_TRUE(NavigateIframeToURL(shell(), http_url, "test"));
+  EXPECT_EQ(http_url, observer.navigation_url());
+  EXPECT_TRUE(observer.navigation_succeeded());
+
+  // These must stay in scope with replace_host.
+  GURL::Replacements replace_host;
+  std::string foo_com("foo.com");
+
+  // Load cross-site page into iframe.
+  GURL cross_site_url(test_server()->GetURL("files/title2.html"));
+  replace_host.SetHostStr(foo_com);
+  cross_site_url = cross_site_url.ReplaceComponents(replace_host);
+  EXPECT_TRUE(NavigateIframeToURL(shell(), cross_site_url, "test"));
+  EXPECT_EQ(cross_site_url, observer.navigation_url());
+  EXPECT_TRUE(observer.navigation_succeeded());
+
+  // Ensure that we have created a new process for the subframe.
+  FrameTreeNode* root =
+      static_cast<WebContentsImpl*>(shell()->web_contents())->
+          GetFrameTree()->root();
+  ASSERT_EQ(1U, root->child_count());
+  FrameTreeNode* child = root->child_at(0);
+  EXPECT_NE(shell()->web_contents()->GetRenderViewHost(),
+            child->current_frame_host()->render_view_host());
+  EXPECT_NE(shell()->web_contents()->GetSiteInstance(),
+            child->current_frame_host()->render_view_host()->GetSiteInstance());
+  EXPECT_NE(shell()->web_contents()->GetRenderProcessHost(),
+            child->current_frame_host()->GetProcess());
+
+  RenderViewHostImpl* child_rvhi =
+      child->current_frame_host()->render_view_host();
+
+  AccessibilityNotificationWaiter accessibility_waiter2(
+      shell(), AccessibilityModeComplete, ui::AX_EVENT_LOAD_COMPLETE,
+      child_rvhi);
+
+  accessibility_waiter.WaitForNotification();
+  accessibility_waiter2.WaitForNotification();
+
+  RenderWidgetHostViewPort* host_view = RenderWidgetHostViewPort::FromRWHV(
+      shell()->web_contents()->GetRenderWidgetHostView());
+
+  BrowserAccessibilityManager* manager =
+      host_view->GetBrowserAccessibilityManager();
+  LOG(INFO) << "Main frame accessibility tree:\n"
+      << manager->SnapshotAXTreeForTesting().ToString();
+
+  BrowserAccessibilityManager* child_frame_manager =
+      RenderWidgetHostViewPort::FromRWHV(child_rvhi->GetView())->
+          GetBrowserAccessibilityManager();
+  LOG(INFO) << "Child frame accessibility tree:\n"
+      << child_frame_manager->SnapshotAXTreeForTesting().ToString();
+
+  // Assert that we can walk from the main frame down into the child frame
+  // directly, getting correct roles and data along the way.
+
+  BrowserAccessibility* ax_root = manager->GetRoot();
+  ASSERT_EQ(ui::AX_ROLE_ROOT_WEB_AREA, ax_root->GetRole());
+  ASSERT_EQ(1U, ax_root->PlatformChildCount());
+
+  BrowserAccessibility* ax_group = ax_root->PlatformGetChild(0);
+  ASSERT_EQ(ui::AX_ROLE_GROUP, ax_group->GetRole());
+  ASSERT_EQ(1U, ax_group->PlatformChildCount());
+
+  BrowserAccessibility* ax_iframe = ax_group->PlatformGetChild(0);
+  ASSERT_EQ(ui::AX_ROLE_IFRAME, ax_iframe->GetRole());
+  ASSERT_EQ(1U, ax_iframe->PlatformChildCount());
+
+  BrowserAccessibility* ax_scroll_area = ax_iframe->PlatformGetChild(0);
+  ASSERT_EQ(ui::AX_ROLE_SCROLL_AREA, ax_scroll_area->GetRole());
+  ASSERT_EQ(1U, ax_scroll_area->PlatformChildCount());
+
+  BrowserAccessibility* ax_child_frame_root =
+      ax_scroll_area->PlatformGetChild(0);
+  ASSERT_EQ(ui::AX_ROLE_ROOT_WEB_AREA, ax_child_frame_root->GetRole());
+  ASSERT_EQ(1U, ax_child_frame_root->PlatformChildCount());
+  ASSERT_EQ("Title Of Awesomeness", ax_child_frame_root->name());
+
+  BrowserAccessibility* ax_child_frame_group =
+      ax_child_frame_root->PlatformGetChild(0);
+  ASSERT_EQ(ui::AX_ROLE_GROUP, ax_child_frame_group->GetRole());
+  ASSERT_EQ(1U, ax_child_frame_group->PlatformChildCount());
+
+  BrowserAccessibility* ax_child_frame_static_text =
+      ax_child_frame_group->PlatformGetChild(0);
+  ASSERT_EQ(ui::AX_ROLE_STATIC_TEXT, ax_child_frame_static_text->GetRole());
+  ASSERT_EQ(0U, ax_child_frame_static_text->PlatformChildCount());
+}
+
+}  // namespace content