Added a class acting as a fake caret for accessibility.

content/browser/accessibility/browser_accessibility_manager_win.cc

Index: content/browser/accessibility/browser_accessibility_manager_win.cc
diff --git a/content/browser/accessibility/browser_accessibility_manager_win.cc b/content/browser/accessibility/browser_accessibility_manager_win.cc
index 1b66a0a3c56ab6c2ed1fcc7e81b072c165f869e3..50208c428672aadf9ec252d98ec4ed612661b9f2 100644
--- a/content/browser/accessibility/browser_accessibility_manager_win.cc
+++ b/content/browser/accessibility/browser_accessibility_manager_win.cc
@@ -204,8 +204,12 @@ BrowserAccessibilityEvent::Result
   // on the HWND's accessibility object and pass it that same id, which
   // we can use to retrieve the IAccessible for this node.
   LONG child_id = -target->unique_id();
-  ::NotifyWinEvent(win_event_type, hwnd, OBJID_CLIENT, child_id);
+  if (event_type == ui::AX_EVENT_DOCUMENT_SELECTION_CHANGED) {
+    // We also need to fire an older MSAA event used by some assistive software.

[dougt, 2017/03/28 15:23:44]

This change seems unrelated to the fake caret.


Nit:  The comment here says "also", but it happens before the event
EVENT_OBJECT_LOCATIONCHANGE.

[dmazzoni, 2017/03/28 15:41:20]

This is definitely related to the fake caret, since the fake caret
moves anytime we get a selection changed event

+    ::NotifyWinEvent(EVENT_OBJECT_LOCATIONCHANGE, hwnd, OBJID_CARET, child_id);
+  }
 
+  ::NotifyWinEvent(win_event_type, hwnd, OBJID_CLIENT, child_id);
   return BrowserAccessibilityEvent::Sent;
 }