UIA: Prevent AT from duplicating min/max/close

Chrome implements its own Minimize, Maximize, and Close buttons, and the
default buttons that UIA adds for all windows are therefore unnecessary.

Adding the `RefuseNonClientSupport` flag to ProviderOptions prevents UIA
from duplicating the window controls.

Bug: 928811
Change-Id: I1341b57b97a9f5a7131394bacb75dbec9f296676
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1747738
Commit-Queue: Ian Prest <iapres@microsoft.com>
Reviewed-by: Kevin Babbitt <kbabbitt@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#686208}

ui/accessibility/platform/ax_platform_node_win.cc

@@ -4096,7 +4096,8 @@ IFACEMETHODIMP AXPlatformNodeWin::get_ProviderOptions(ProviderOptions* ret) {
   WIN_ACCESSIBILITY_API_HISTOGRAM(UMA_API_GET_PROVIDER_OPTIONS);
   UIA_VALIDATE_CALL_1_ARG(ret);
 
-  *ret = ProviderOptions_ServerSideProvider | ProviderOptions_UseComThreading;
+  *ret = ProviderOptions_ServerSideProvider | ProviderOptions_UseComThreading |
+         ProviderOptions_RefuseNonClientSupport;
   return S_OK;
 }
 

ui/accessibility/platform/ax_platform_node_win_unittest.cc

@@ -4119,9 +4119,10 @@ TEST_F(AXPlatformNodeWinTest, TestUIAGetProviderOptions) {
 
   ProviderOptions provider_options = static_cast<ProviderOptions>(0);
   EXPECT_HRESULT_SUCCEEDED(root_node->get_ProviderOptions(&provider_options));
-  EXPECT_EQ(
-      ProviderOptions_ServerSideProvider | ProviderOptions_UseComThreading,
-      provider_options);
+  EXPECT_EQ(ProviderOptions_ServerSideProvider |
+                ProviderOptions_UseComThreading |
+                ProviderOptions_RefuseNonClientSupport,
+            provider_options);
 }
 
 TEST_F(AXPlatformNodeWinTest, TestUIAGetHostRawElementProvider) {