Enable SkTaskGroup threading in monobench.
Without this Enabler, SkTaskGroups all run serially.
BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2139423002
Review-Url: https://codereview.chromium.org/2139423002
diff --git a/tools/monobench.cpp b/tools/monobench.cpp
index 757e9d3..88a6cce 100644
--- a/tools/monobench.cpp
+++ b/tools/monobench.cpp
@@ -7,6 +7,7 @@
#include "Benchmark.h"
#include "SkGraphics.h"
+#include "SkTaskGroup.h"
#include <algorithm>
#include <chrono>
#include <regex>
@@ -16,6 +17,7 @@
int main(int argc, char** argv) {
SkGraphics::Init();
+ SkTaskGroup::Enabler enabled;
using clock = std::chrono::high_resolution_clock;
using ns = std::chrono::duration<double, std::nano>;