Add basic support for accessibility hit testing within web contents....

chrome/browser/accessibility/browser_accessibility_manager.cc

 // Copyright (c) 2010 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 "chrome/browser/accessibility/browser_accessibility_manager.h"
 
 #include "chrome/browser/accessibility/browser_accessibility.h"
 
 using webkit_glue::WebAccessibility;
 
@@ skipping 208 matching lines @@
   if (delegate_)
     delegate_->SetAccessibilityFocus(node.renderer_id());
 }
 
 void BrowserAccessibilityManager::DoDefaultAction(
     const BrowserAccessibility& node) {
   if (delegate_)
     delegate_->AccessibilityDoDefaultAction(node.renderer_id());
 }
 
+gfx::Rect BrowserAccessibilityManager::GetViewBounds(){
+  if (delegate_)
+    return delegate_->GetViewBounds();
+  return gfx::Rect();
+}
+
 bool BrowserAccessibilityManager::CanModifyTreeInPlace(
     BrowserAccessibility* current_root,
     const WebAccessibility& new_root) {
   if (current_root->renderer_id() != new_root.id)
     return false;
   if (current_root->GetChildCount() != new_root.children.size())
     return false;
   for (unsigned int i = 0; i < current_root->GetChildCount(); i++) {
     if (!CanModifyTreeInPlace(current_root->GetChild(i),
                               new_root.children[i])) {
@@ skipping 70 matching lines @@
   if ((src.state >> WebAccessibility::STATE_FOCUSED) & 1)
     focus_ = instance;
   for (int i = 0; i < static_cast<int>(src.children.size()); ++i) {
     BrowserAccessibility* child = CreateAccessibilityTree(
         instance, GetNextChildID(), src.children[i], i);
     instance->AddChild(child);
   }
 
   return instance;
 }