Added an internal mapping from roles to UI Automation control types

R=nektar@chromium.org,dmazzoni@chromium.org

Bug: 845474
Change-Id: I77f6dd6ef5c51ecbba2684c14c0680d0366ce6e3
Reviewed-on: https://chromium-review.googlesource.com/1108571
Commit-Queue: Nektarios Paisios <nektar@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Nektarios Paisios <nektar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569306}

ui/accessibility/platform/ax_platform_node_win.h

@@ -690,6 +690,8 @@ class AX_EXPORT __declspec(uuid("26f5641a-246d-457b-a96d-07f3fae6acf2"))
 
   base::string16 ComputeUIAProperties();
 
+  long ComputeUIAControlType();
+
   AXHypertext ComputeHypertext();
 
   // AXPlatformNodeBase overrides.