Avoid DCHECK failures from get_characterExtents and get_unclippedSubstrings

content/browser/accessibility/browser_accessibility_win.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_win.h"
 
 #include <UIAutomationClient.h>
 #include <UIAutomationCoreApi.h>
 
 #include "base/strings/string_number_conversions.h"
@@ skipping 1914 matching lines @@
 
   if (!out_x || !out_y || !out_width || !out_height)
     return E_INVALIDARG;
 
   const string16& text_str = TextForIAccessibleText();
   HandleSpecialTextOffset(text_str, &offset);
 
   if (offset < 0 || offset > static_cast<LONG>(text_str.size()))
     return E_INVALIDARG;
 
+  if (role_ != blink::WebAXRoleStaticText)
+    return E_FAIL;
+
   gfx::Rect character_bounds;
   if (coordinate_type == IA2_COORDTYPE_SCREEN_RELATIVE) {
     character_bounds = GetGlobalBoundsForRange(offset, 1);
   } else if (coordinate_type == IA2_COORDTYPE_PARENT_RELATIVE) {
     character_bounds = GetLocalBoundsForRange(offset, 1);
     character_bounds -= location().OffsetFromOrigin();
   } else {
     return E_INVALIDARG;
   }
 
@@ skipping 765 matching lines @@
   if (!out_x || !out_y || !out_width || !out_height)
     return E_INVALIDARG;
 
   const string16& text_str = TextForIAccessibleText();
   if (start_index > text_str.size() ||
       end_index > text_str.size() ||
       start_index > end_index) {
     return E_INVALIDARG;
   }
 
+  if (role_ != blink::WebAXRoleStaticText)
+    return E_FAIL;
+
   gfx::Rect bounds = GetGlobalBoundsForRange(
       start_index, end_index - start_index);
   *out_x = bounds.x();
   *out_y = bounds.y();
   *out_width = bounds.width();
   *out_height = bounds.height();
   return S_OK;
 }
 
 STDMETHODIMP BrowserAccessibilityWin::scrollToSubstring(
@@ skipping 1035 matching lines @@
   // The role should always be set.
   DCHECK(!role_name_.empty() || ia_role_);
 
   // If we didn't explicitly set the IAccessible2 role, make it the same
   // as the MSAA role.
   if (!ia2_role_)
     ia2_role_ = ia_role_;
 }
 
 }  // namespace content