Update Windows It2Me to allow remote users to interact with elevated windows

remoting/host/win/elevation_helpers.cc

Index: remoting/host/win/elevation_helpers.cc
diff --git a/remoting/host/win/elevation_helpers.cc b/remoting/host/win/elevation_helpers.cc
index 7e8fb76cd21168f98e8b362165291a7c7e091297..dee90162d9469f3a007957bfe2a8d3a85bc5f0f0 100644
--- a/remoting/host/win/elevation_helpers.cc
+++ b/remoting/host/win/elevation_helpers.cc
@@ -6,23 +6,52 @@
 
 #include <windows.h>
 
+#include "base/logging.h"
 #include "base/win/scoped_handle.h"
 
-namespace remoting {
+namespace {
+
+void GetCurrentProcessToken(base::win::ScopedHandle* scoped_handle) {
+  DCHECK(scoped_handle);
 
-bool IsProcessElevated() {
   HANDLE process_token;
   OpenProcessToken(GetCurrentProcess(), TOKEN_QUERY, &process_token);
+  scoped_handle->Set(process_token);
+  DCHECK(scoped_handle->IsValid());
+}
+
+}  // namespace
+
+namespace remoting {
 
-  base::win::ScopedHandle scoped_process_token(process_token);
+bool IsProcessElevated() {
+  base::win::ScopedHandle scoped_process_token;
+  GetCurrentProcessToken(&scoped_process_token);
 
   // Unlike TOKEN_ELEVATION_TYPE which returns TokenElevationTypeDefault when
-  // UAC is turned off, TOKEN_ELEVATION will tell you the process is elevated.
+  // UAC is turned off, TOKEN_ELEVATION returns whether the process is elevated.
   DWORD size;
   TOKEN_ELEVATION elevation;
-  GetTokenInformation(process_token, TokenElevation,
-                      &elevation, sizeof(elevation), &size);
+  if (!GetTokenInformation(scoped_process_token.Get(), TokenElevation,
+                           &elevation, sizeof(elevation), &size)) {
+    PLOG(ERROR) << "GetTokenInformation() failed";
+    return false;
+  }
   return elevation.TokenIsElevated != 0;
 }
 
+bool CurrentProcessHasUiAccess() {
+  base::win::ScopedHandle scoped_process_token;
+  GetCurrentProcessToken(&scoped_process_token);
+
+  DWORD size;
+  DWORD uiaccess_value = 0;
+  if (!GetTokenInformation(scoped_process_token.Get(), TokenUIAccess,
+                           &uiaccess_value, sizeof(uiaccess_value), &size)) {
+    PLOG(ERROR) << "GetTokenInformation() failed";
+    return false;
+  }
+  return uiaccess_value != 0;
+}
+
 }  // namespace remoting