Cross-process iframe accessibility.

content/browser/frame_host/render_frame_host_impl.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 "content/browser/frame_host/render_frame_host_impl.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/containers/hash_tables.h"
 #include "base/lazy_instance.h"
 #include "base/metrics/histogram.h"
 #include "base/metrics/user_metrics_action.h"
 #include "base/time/time.h"
 #include "content/browser/accessibility/accessibility_mode_helper.h"
 #include "content/browser/accessibility/browser_accessibility_manager.h"
 #include "content/browser/accessibility/browser_accessibility_state_impl.h"
 #include "content/browser/child_process_security_policy_impl.h"
 #include "content/browser/frame_host/cross_process_frame_connector.h"
 #include "content/browser/frame_host/cross_site_transferring_request.h"
 #include "content/browser/frame_host/frame_tree.h"
 #include "content/browser/frame_host/frame_tree_node.h"
 #include "content/browser/frame_host/navigator.h"
 #include "content/browser/frame_host/render_frame_host_delegate.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/input/input_router.h"
 #include "content/browser/renderer_host/input/timeout_monitor.h"
 #include "content/browser/renderer_host/render_process_host_impl.h"
 #include "content/browser/renderer_host/render_view_host_delegate.h"
 #include "content/browser/renderer_host/render_view_host_delegate_view.h"
 #include "content/browser/renderer_host/render_view_host_impl.h"
 #include "content/browser/renderer_host/render_widget_host_impl.h"
 #include "content/browser/renderer_host/render_widget_host_view_base.h"
 #include "content/browser/transition_request_manager.h"
 #include "content/common/accessibility_messages.h"
@@ skipping 428 matching lines @@
 
 gfx::NativeViewAccessible
     RenderFrameHostImpl::AccessibilityGetNativeViewAccessible() {
   RenderWidgetHostViewBase* view = static_cast<RenderWidgetHostViewBase*>(
       render_view_host_->GetView());
   if (view)
     return view->AccessibilityGetNativeViewAccessible();
   return NULL;
 }
 
+BrowserAccessibilityManager* RenderFrameHostImpl::AccessibilityGetChildFrame(
+    int64 frame_tree_node_id) {
+  FrameTreeNode* child_node = FrameTree::GloballyFindByID(frame_tree_node_id);
+  if (!child_node)
+    return NULL;
+
+  // We should have gotten a node in the same frame tree.
+  CHECK(child_node->frame_tree() == frame_tree_node()->frame_tree());
+
+  RenderFrameHostImpl* child_rfhi = child_node->current_frame_host();
+
+  // Return NULL if this isn't an out-of-process iframe. Same-process iframes
+  // are already part of the accessibility tree.
+  if (child_rfhi->GetProcess()->GetID() == GetProcess()->GetID())
+    return NULL;
+
+  return child_rfhi->GetOrCreateBrowserAccessibilityManager();
+}
+
+BrowserAccessibilityManager*
+RenderFrameHostImpl::AccessibilityGetParentFrame() {
+  FrameTreeNode* parent_node = frame_tree_node()->parent();
+  if (!parent_node)
+    return NULL;
+
+  RenderFrameHostImpl* parent_frame = parent_node->current_frame_host();
+  if (!parent_frame)
+    return NULL;
+
+  return parent_frame->GetOrCreateBrowserAccessibilityManager();
+}
+
 bool RenderFrameHostImpl::CreateRenderFrame(int parent_routing_id) {
   TRACE_EVENT0("navigation", "RenderFrameHostImpl::CreateRenderFrame");
   DCHECK(!IsRenderFrameLive()) << "Creating frame twice";
 
   // The process may (if we're sharing a process with another host that already
   // initialized it) or may not (we have our own process or the old process
   // crashed) have been initialized. Calling Init multiple times will be
   // ignored, so this is safe.
   if (!GetProcess()->Init())
     return false;
@@ skipping 481 matching lines @@
 
   AccessibilityMode accessibility_mode = delegate_->GetAccessibilityMode();
   if ((accessibility_mode != AccessibilityModeOff) && view &&
       RenderViewHostImpl::IsRVHStateActive(render_view_host_->rvh_state())) {
     if (accessibility_mode & AccessibilityModeFlagPlatform) {
       GetOrCreateBrowserAccessibilityManager();
       if (browser_accessibility_manager_)
         browser_accessibility_manager_->OnAccessibilityEvents(params);
     }
 
+    if (browser_accessibility_manager_) {
+      // Get the frame routing ids from out-of-process iframes and use them
+      // to notify our BrowserAccessibilityManager of the frame tree node id of
+      // any of its child frames.
+      for (unsigned int i = 0; i < params.size(); ++i) {

[nasko, 2014/09/05 16:29:02]

Let's use size_t instead of unsigned int here.

+        const AccessibilityHostMsg_EventParams& param = params[i];
+        std::map<int32, int>::const_iterator iter;
+        for (iter = param.node_to_frame_routing_id_map.begin();
+             iter != param.node_to_frame_routing_id_map.end();
+             ++iter) {
+          // This is the id of the accessibility node that has a child frame.
+          int32 node_id = iter->first;
+          // The routing id from either a RenderFrame or a RenderFrameProxy.
+          int frame_routing_id = iter->second;
+
+          FrameTree* frame_tree = frame_tree_node()->frame_tree();
+          FrameTreeNode* child_frame_tree_node = frame_tree->FindByRoutingID(
+              GetProcess()->GetID(), frame_routing_id);
+          if (child_frame_tree_node) {
+            browser_accessibility_manager_->SetChildFrameTreeNodeId(
+                 node_id, child_frame_tree_node->frame_tree_node_id());
+          }
+        }
+      }
+    }
+
+    // Send the updates to the automation extension API.
     std::vector<AXEventNotificationDetails> details;
     details.reserve(params.size());
     for (size_t i = 0; i < params.size(); ++i) {
       const AccessibilityHostMsg_EventParams& param = params[i];
       AXEventNotificationDetails detail(param.update.node_id_to_clear,
                                         param.update.nodes,
                                         param.event_type,
                                         param.id,
                                         GetProcess()->GetID(),
                                         routing_id_);
       details.push_back(detail);
     }
 
     delegate_->AccessibilityEventReceived(details);
   }
 
   // Always send an ACK or the renderer can be in a bad state.
   Send(new AccessibilityMsg_Events_ACK(routing_id_));
 
   // The rest of this code is just for testing; bail out if we're not
   // in that mode.
   if (accessibility_testing_callback_.is_null())
     return;
 
   for (size_t i = 0; i < params.size(); i++) {
     const AccessibilityHostMsg_EventParams& param = params[i];
     if (static_cast<int>(param.event_type) < 0)
       continue;
+
     if (!ax_tree_for_testing_) {
-      ax_tree_for_testing_.reset(new ui::AXTree(param.update));
+      if (browser_accessibility_manager_) {
+        ax_tree_for_testing_.reset(new ui::AXTree(
+            browser_accessibility_manager_->SnapshotAXTreeForTesting()));
+      } else {
+        ax_tree_for_testing_.reset(new ui::AXTree());
+        CHECK(ax_tree_for_testing_->Unserialize(param.update))
+            << ax_tree_for_testing_->error();
+      }
     } else {
       CHECK(ax_tree_for_testing_->Unserialize(param.update))
           << ax_tree_for_testing_->error();
     }
     accessibility_testing_callback_.Run(param.event_type, param.id);
   }
 }
 
 void RenderFrameHostImpl::OnAccessibilityLocationChanges(
     const std::vector<AccessibilityHostMsg_LocationChangeParams>& params) {
@@ skipping 322 matching lines @@
   // Clear any state if a pending navigation is canceled or preempted.
   if (suspended_nav_params_)
     suspended_nav_params_.reset();
 
   TRACE_EVENT_ASYNC_END0("navigation",
                          "RenderFrameHostImpl navigation suspended", this);
   navigations_suspended_ = false;
 }
 
 }  // namespace content