hwui: add missing <mutex> include

Upgrading to clang-r522817's new libc++ requires that <mutex> be
included here.

Bug: 333165689
Test: treehugger
Flag: EXEMPT, fix build error
Change-Id: I14ff396b21feb4b569a3c8d967c8295a04005beb

parent d666832c

libs/hwui/pipeline/skia/ShaderCache.cpp

+4 −0

Original line number	Diff line number	Diff line
		@@ -15,14 +15,18 @@
		*/

		#include "ShaderCache.h"

		#include <GrDirectContext.h>
		#include <SkData.h>
		#include <gui/TraceUtils.h>
		#include <log/log.h>
		#include <openssl/sha.h>

		#include <algorithm>
		#include <array>
		#include <mutex>
		#include <thread>

		#include "FileBlobCache.h"
		#include "Properties.h"