Cross-process iframe accessibility.

content/browser/accessibility/site_per_process_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/strings/stringprintf.h"
+#include "content/browser/accessibility/browser_accessibility.h"
+#include "content/browser/accessibility/browser_accessibility_manager.h"
+#include "content/browser/accessibility/browser_accessibility_state_impl.h"
+#include "content/browser/frame_host/cross_process_frame_connector.h"
+#include "content/browser/frame_host/frame_tree.h"
+#include "content/browser/frame_host/render_frame_proxy_host.h"
+#include "content/browser/frame_host/render_widget_host_view_child_frame.h"
+#include "content/browser/renderer_host/render_view_host_impl.h"
+#include "content/browser/web_contents/web_contents_impl.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_observer.h"
+#include "content/public/common/content_switches.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 "content/test/content_browser_test_utils_internal.h"
+#include "net/dns/mock_host_resolver.h"
+#include "url/gurl.h"
+
+namespace content {
+
+// TODO(dmazzoni): share this with site_per_process_browsertest.cc

[Charlie Reis, 2014/08/21 19:23:27]

Can you subclass SitePerProcessBrowserTest, or is something like DEPS preventing
that?

We can abstract it out into useful test utilities if needed.

[dmazzoni, 2014/08/25 06:49:36]

Done.

+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));
+  }
+
+  bool NavigateIframeToURL(Shell* window,
+                           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 WebContents.
+  BrowserAccessibilityState::GetInstance()->EnableAccessibility();
+
+  AccessibilityNotificationWaiter main_frame_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);
+
+  // It is safe to obtain the root frame tree node here, as it doesn't change.
+  FrameTreeNode* root =
+      static_cast<WebContentsImpl*>(shell()->web_contents())->
+          GetFrameTree()->root();
+
+  // Load same-site page into iframe.
+  FrameTreeNode* child = root->child_at(0);
+  GURL http_url(test_server()->GetURL("files/title1.html"));
+  NavigateFrameToURL(child, http_url);
+  RenderFrameProxyHost* proxy_to_parent =
+      child->render_manager()->GetRenderFrameProxyHost(
+          shell()->web_contents()->GetSiteInstance());
+  EXPECT_FALSE(proxy_to_parent);
+
+  // 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);
+  NavigateFrameToURL(root->child_at(0), cross_site_url);
+
+  // Ensure that we have created a new process for the subframe.
+  ASSERT_EQ(1U, root->child_count());
+  SiteInstance* site_instance = child->current_frame_host()->GetSiteInstance();
+  RenderViewHost* rvh = child->current_frame_host()->render_view_host();
+  RenderProcessHost* rph = child->current_frame_host()->GetProcess();
+  EXPECT_NE(shell()->web_contents()->GetRenderViewHost(), rvh);

[Charlie Reis, 2014/08/21 19:23:27]

Many of these checks are redundant with the CrossSiteIframe test.  We can just
verify that the frame has a different SiteInstance and move on to the
interesting accessibility checks.

[dmazzoni, 2014/08/25 06:49:36]

Sounds good.

I deleted the ones that seemed the most redundant. Let me know if there's more
you think is unnecessary.

[Charlie Reis, 2014/08/25 20:58:43]

Looks good now, thanks.

+  EXPECT_NE(shell()->web_contents()->GetSiteInstance(), site_instance);
+  EXPECT_NE(shell()->web_contents()->GetRenderProcessHost(), rph);
+  proxy_to_parent = child->render_manager()->GetProxyToParent();
+  EXPECT_TRUE(proxy_to_parent);
+  EXPECT_TRUE(proxy_to_parent->cross_process_frame_connector());
+  EXPECT_EQ(
+      rvh->GetView(),
+      proxy_to_parent->cross_process_frame_connector()->get_view_for_testing());
+
+  // Wait until the accessibility tree from both the main frame and
+  // cross-process iframe load.
+  RenderFrameHostImpl* child_frame = static_cast<RenderFrameHostImpl*>(
+      child->current_frame_host());
+  AccessibilityNotificationWaiter child_frame_accessibility_waiter(
+      child_frame, ui::AX_EVENT_NONE);
+  main_frame_accessibility_waiter.WaitForNotification();
+  child_frame_accessibility_waiter.WaitForNotification();
+
+  RenderFrameHostImpl* main_frame = static_cast<RenderFrameHostImpl*>(
+      shell()->web_contents()->GetMainFrame());
+  BrowserAccessibilityManager* main_frame_manager =
+      main_frame->browser_accessibility_manager();
+  VLOG(1) << "Main frame accessibility tree:\n"
+          << main_frame_manager->SnapshotAXTreeForTesting().ToString();
+
+  BrowserAccessibilityManager* child_frame_manager =
+      child_frame->browser_accessibility_manager();
+  VLOG(1) << "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 = main_frame_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());
+
+  // Last, check that the parent of the child frame root is correct.
+  ASSERT_EQ(ax_child_frame_root->GetParent(), ax_scroll_area);
+}
+
+}  // namespace content