Add a WebContentsImpl API to snapshot the accessibility tree.

content/renderer/render_frame_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/renderer/render_frame_impl.h"
 
 #include <map>
 #include <string>
 
 #include "base/auto_reset.h"
@@ skipping 1024 matching lines @@
                         OnHideTransitionElements)
     IPC_MESSAGE_HANDLER(FrameMsg_ShowTransitionElements,
                         OnShowTransitionElements)
     IPC_MESSAGE_HANDLER(FrameMsg_Reload, OnReload)
     IPC_MESSAGE_HANDLER(FrameMsg_TextSurroundingSelectionRequest,
                         OnTextSurroundingSelectionRequest)
     IPC_MESSAGE_HANDLER(FrameMsg_AddStyleSheetByURL,
                         OnAddStyleSheetByURL)
     IPC_MESSAGE_HANDLER(FrameMsg_SetAccessibilityMode,
                         OnSetAccessibilityMode)
+    IPC_MESSAGE_HANDLER(AccessibilityMsg_SnapshotTree,
+                        OnSnapshotAccessibilityTree)
     IPC_MESSAGE_HANDLER(FrameMsg_DisownOpener, OnDisownOpener)
     IPC_MESSAGE_HANDLER(FrameMsg_CommitNavigation, OnCommitNavigation)
     IPC_MESSAGE_HANDLER(FrameMsg_DidUpdateSandboxFlags, OnDidUpdateSandboxFlags)
 #if defined(OS_ANDROID)
     IPC_MESSAGE_HANDLER(FrameMsg_SelectPopupMenuItems, OnSelectPopupMenuItems)
 #elif defined(OS_MACOSX)
     IPC_MESSAGE_HANDLER(FrameMsg_SelectPopupMenuItem, OnSelectPopupMenuItem)
     IPC_MESSAGE_HANDLER(InputMsg_CopyToFindPboard, OnCopyToFindPboard)
 #endif
   IPC_END_MESSAGE_MAP()
@@ skipping 501 matching lines @@
     delete renderer_accessibility_;
     renderer_accessibility_ = NULL;
   }
   if (accessibility_mode_ == AccessibilityModeOff)
     return;
 
   if (accessibility_mode_ & AccessibilityModeFlagFullTree)
     renderer_accessibility_ = new RendererAccessibility(this);
 }
 
+void RenderFrameImpl::OnSnapshotAccessibilityTree(int token) {
+  ui::AXTreeUpdate response;
+  RendererAccessibility::SnapshotAccessibilityTree(this, &response);
+  Send(new AccessibilityHostMsg_SnapshotResponse(routing_id_, token, response));
+}
+
 void RenderFrameImpl::OnDisownOpener() {
   // TODO(creis): We should only see this for main frames for now.  To support
   // disowning the opener on subframes, we will need to move WebContentsImpl's
   // opener_ to FrameTreeNode.
   CHECK(!frame_->parent());
 
   if (frame_->opener())
     frame_->setOpener(NULL);
 }
 
@@ skipping 3116 matching lines @@
 
 #if defined(ENABLE_BROWSER_CDMS)
 RendererCdmManager* RenderFrameImpl::GetCdmManager() {
   if (!cdm_manager_)
     cdm_manager_ = new RendererCdmManager(this);
   return cdm_manager_;
 }
 #endif  // defined(ENABLE_BROWSER_CDMS)
 
 }  // namespace content