MacViews/a11y: Allow accessibility clients to update the selected text.

ui/accessibility/platform/ax_platform_node_win.cc

 // Copyright 2015 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 <atlbase.h>
 #include <atlcom.h>
 #include <limits.h>
 #include <oleacc.h>
 #include <stdint.h>
 
@@ skipping 436 matching lines @@
 }
 
 STDMETHODIMP AXPlatformNodeWin::get_accValue(VARIANT var_id, BSTR* value) {
   COM_OBJECT_VALIDATE_VAR_ID_1_ARG(var_id, value);
   return GetStringAttributeAsBstr(ui::AX_ATTR_VALUE, value);
 }
 
 STDMETHODIMP AXPlatformNodeWin::put_accValue(VARIANT var_id,
                                              BSTR new_value) {
   COM_OBJECT_VALIDATE_VAR_ID(var_id);
-  if (delegate_->SetStringValue(new_value))
+  if (delegate_->SetStringValue(new_value, false))

[tapted, 2016/10/27 02:09:56]

should this be 'true' to preserve existing behaviour?

[Patti Lor, 2016/10/31 00:35:05]

Yes, thank you! Fixed now.

     return S_OK;
   return E_FAIL;
 }
 
 // IAccessible functions not supported.
 
 STDMETHODIMP AXPlatformNodeWin::get_accSelection(VARIANT* selected) {
   COM_OBJECT_VALIDATE_1_ARG(selected);
   if (selected)
     selected->vt = VT_EMPTY;
@@ skipping 679 matching lines @@
     ui::TextBoundaryDirection direction) {
   HandleSpecialTextOffset(text, &start_offset);
   ui::TextBoundaryType boundary = IA2TextBoundaryToTextBoundary(ia2_boundary);
   std::vector<int32_t> line_breaks;
   return static_cast<LONG>(ui::FindAccessibleTextBoundary(
       text, line_breaks, boundary, start_offset, direction,
       AX_TEXT_AFFINITY_DOWNSTREAM));
 }
 
 }  // namespace ui