Enable ClangTidy guard bugprone-unused-raii.

https://clang.llvm.org/extra/clang-tidy/checks/bugprone-unused-raii.html
-------
Finds temporaries that look like RAII objects.

The canonical example for this is a scoped lock.

{
  scoped_lock(&global_mutex);
  critical_section();
}

The destructor of the scoped_lock is called before the critical_section
is entered, leaving it unprotected.
-------

Change-Id: I40394eb84e7e4ad0564c409ecb52df2ef5af35b6
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/306838
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>

Author: johnstiles-google

.clang-tidy

@@ -1 +1 @@
-Checks: '-*,bugprone-use-after-move,bugprone-undelegated-constructor,google-build-namespaces'
+Checks: '-*,bugprone-use-after-move,bugprone-unused-raii,bugprone-undelegated-constructor,google-build-namespaces'