Reports the position of the caret and current selection in content editables.

content/browser/accessibility/browser_accessibility.cc

 // Copyright (c) 2012 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/accessibility/browser_accessibility.h"
 
 #include <algorithm>
 
 #include "base/logging.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 50 matching lines @@
 
 uint32 BrowserAccessibility::PlatformChildCount() const {
   return PlatformIsLeaf() ? 0 : InternalChildCount();
 }
 
 bool BrowserAccessibility::IsNative() const {
   return false;
 }
 
 bool BrowserAccessibility::IsDescendantOf(
-    BrowserAccessibility* ancestor) {
+    const BrowserAccessibility* ancestor) const {
   if (this == ancestor) {
     return true;
   } else if (GetParent()) {
     return GetParent()->IsDescendantOf(ancestor);
   }
 
   return false;
 }
 
 BrowserAccessibility* BrowserAccessibility::PlatformGetChild(
@@ skipping 526 matching lines @@
 
 bool BrowserAccessibility::IsEditableText() const {
   // These roles don't have readonly set, but they're not editable text.
   if (GetRole() == ui::AX_ROLE_SCROLL_AREA ||
       GetRole() == ui::AX_ROLE_COLUMN ||
       GetRole() == ui::AX_ROLE_TABLE_HEADER_CONTAINER) {
     return false;
   }
 
   // Note: WebAXStateReadonly being false means it's either a text control,
-  // or contenteditable. We also check for editable text roles to cover
-  // another element that has role=textbox set on it.
+  // or contenteditable. We also check for the text field role to cover
+  // elements that have role=textbox set on it.
   return (!HasState(ui::AX_STATE_READ_ONLY) ||
           GetRole() == ui::AX_ROLE_TEXT_FIELD);
 }
 
 bool BrowserAccessibility::IsWebAreaForPresentationalIframe() const {
   if (GetRole() != ui::AX_ROLE_WEB_AREA &&
       GetRole() != ui::AX_ROLE_ROOT_WEB_AREA) {
     return false;
   }
 
@@ skipping 126 matching lines @@
       }
       need_to_offset_web_area = true;
     }
     parent = parent->GetParentForBoundsCalculation();
   }
 
   return bounds;
 }
 
 }  // namespace content