One accessibility tree per frame.

content/browser/frame_host/render_frame_host_impl.h

 // 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.
 
 #ifndef CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_IMPL_H_
 #define CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 449 matching lines @@
   // Resets the accessibility serializer in the renderer.
   void AccessibilityReset();
 
   // Turn on accessibility testing. The given callback will be run
   // every time an accessibility notification is received from the
   // renderer process, and the accessibility tree it sent can be
   // retrieved using GetAXTreeForTesting().
   void SetAccessibilityCallbackForTesting(
       const base::Callback<void(ui::AXEvent, int)>& callback);
 
+  // Called when the metadata about the accessibility tree for this frame
+  // changes due to a browser-side change, as opposed to due to an IPC from
+  // a renderer.
+  void UpdateAXTreeData();
+
   // Send a message to the render process to change text track style settings.
   void SetTextTrackSettings(const FrameMsg_TextTrackSettings_Params& params);
 
   // Returns a snapshot of the accessibility tree received from the
   // renderer as of the last time an accessibility notification was
   // received.
   const ui::AXTree* GetAXTreeForTesting();
 
   // Access the BrowserAccessibilityManager if it already exists.
   BrowserAccessibilityManager* browser_accessibility_manager() const {
@@ skipping 220 matching lines @@
   // main frame.
   AXTreeIDRegistry::AXTreeID BrowserPluginInstanceIDToAXTreeID(int routing_id);
 
   // Convert the content-layer-specific AXContentNodeData to a general-purpose
   // AXNodeData structure.
   void AXContentNodeDataToAXNodeData(const AXContentNodeData& src,
                                      ui::AXNodeData* dst);
 
   // Convert the content-layer-specific AXContentTreeData to a general-purpose
   // AXTreeData structure.
-  void AXContentTreeDataToAXTreeData(const AXContentTreeData& src,
-                                     ui::AXTreeData* dst);
+  void AXContentTreeDataToAXTreeData(ui::AXTreeData* dst);
 
   // Returns the RenderWidgetHostView used for accessibility. For subframes,
   // this function will return the platform view on the main frame; for main
   // frames, it will return the current frame's view.
   RenderWidgetHostViewBase* GetViewForAccessibility();
 
   // Sends a navigate message to the RenderFrame and notifies DevTools about
   // navigation happening. Should be used instead of sending the message
   // directly.
   void SendNavigateMessage(
@@ skipping 152 matching lines @@
 
   // This is nonzero if we sent an accessibility reset to the renderer and
   // we're waiting for an IPC containing this reset token (sequentially
   // assigned) and a complete replacement accessibility tree.
   int accessibility_reset_token_;
 
   // A count of the number of times we needed to reset accessibility, so
   // we don't keep trying to reset forever.
   int accessibility_reset_count_;
 
+  // The last AXContentTreeData for this frame received from the RenderFrame.
+  AXContentTreeData ax_content_tree_data_;
+
   // The mapping from callback id to corresponding callback for pending
   // accessibility tree snapshot calls created by RequestAXTreeSnapshot.
   std::map<int, AXTreeSnapshotCallback> ax_tree_snapshot_callbacks_;
 
   // Callback when an event is received, for testing.
   base::Callback<void(ui::AXEvent, int)> accessibility_testing_callback_;
   // The most recently received accessibility tree - for testing only.
   scoped_ptr<ui::AXTree> ax_tree_for_testing_;
   // Flag to not create a BrowserAccessibilityManager, for testing. If one
   // already exists it will still be used.
@@ skipping 37 matching lines @@
 
   // NOTE: This must be the last member.
   base::WeakPtrFactory<RenderFrameHostImpl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderFrameHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_IMPL_H_