Suppress leak in WorkerScritController

BUG=403544
TBR=michaeln@chromium.org

Review URL: https://codereview.chromium.org/467373003

Cr-Commit-Position: refs/heads/master@{#289393}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@289393 0039d316-1c4b-4281-b951-d872f2087c98

tools/valgrind/drmemory/suppressions_full.txt

@@ -2209,3 +2209,14 @@ system call NtWriteFile parameter #5
 KERNELBASE.dll!WriteFile
 KERNEL32.dll!WriteFile
 mojo_system_impl.dll!mojo::system::`anonymous namespace'::RawChannelWin::WriteNoLock
+
+HANDLE LEAK
+name=bug_403544
+system call NtCreateSemaphore
+KERNELBASE.dll!CreateSemaphoreExW
+...
+v8.dll!v8::internal::SweeperThread::SweeperThread
+...
+blink_web.dll!blink::WorkerScriptController::WorkerScriptController
+blink_web.dll!blink::WorkerGlobalScope::WorkerGlobalScope
+blink_web.dll!blink::ServiceWorkerGlobalScope::ServiceWorkerGlobalScope