Implement put_accvalue for textfields and location bar.

ui/views/accessibility/native_view_accessibility_win.h

Index: ui/views/accessibility/native_view_accessibility_win.h
diff --git a/ui/views/accessibility/native_view_accessibility_win.h b/ui/views/accessibility/native_view_accessibility_win.h
index aff2a6f6e8725bd04a30ba1636e2c2da3a7ad653..e616551b9689793689ae5c8412eacc65dd065119 100644
--- a/ui/views/accessibility/native_view_accessibility_win.h
+++ b/ui/views/accessibility/native_view_accessibility_win.h
@@ -114,10 +114,11 @@ NativeViewAccessibilityWin
   // Retrieves the current state of the specified object.
   STDMETHODIMP get_accState(VARIANT var_id, VARIANT* state);
 
-  // Retrieves the current value associated with the specified object.
+  // Retrieve or set the string value associated with the specified object.
+  // Setting the value is not typically used by screen readers, but it's
+  // used frequently by automation software.
   STDMETHODIMP get_accValue(VARIANT var_id, BSTR* value);
-
-  // Non-supported IAccessible methods.
+  STDMETHODIMP put_accValue(VARIANT var_id, BSTR new_value);
 
   // Selections not applicable to views.
   STDMETHODIMP get_accSelection(VARIANT* selected);
@@ -131,7 +132,6 @@ NativeViewAccessibilityWin
 
   // Deprecated functions, not implemented here.
   STDMETHODIMP put_accName(VARIANT var_id, BSTR put_name);
-  STDMETHODIMP put_accValue(VARIANT var_id, BSTR put_val);
 
   //
   // IAccessible2