Create a thermal manager class and wire it in to nanobench behind a flag

bench/nanobench.cpp

Index: bench/nanobench.cpp
diff --git a/bench/nanobench.cpp b/bench/nanobench.cpp
index c2bcb4950ac6b6ac6f5896412deb3cb8ccf44fee..2fafb27d2c7c143f0dc31b9b364a9ac1b0db00a4 100644
--- a/bench/nanobench.cpp
+++ b/bench/nanobench.cpp
@@ -38,6 +38,7 @@
 #include "SkSurface.h"
 #include "SkTaskGroup.h"
 #include "SkThreadUtils.h"
+#include "ThermalManager.h"
 
 #include <stdlib.h>
 
@@ -111,6 +112,7 @@ DEFINE_bool(resetGpuContext, true, "Reset the GrContext before running each test
 DEFINE_bool(gpuStats, false, "Print GPU stats after each gpu benchmark?");
 DEFINE_bool(gpuStatsDump, false, "Dump GPU states after each benchmark to json");
 DEFINE_bool(keepAlive, false, "Print a message every so often so that we don't time out");
+DEFINE_bool(useThermalManager, false, "Uses a thermal manager to prevent overheating\n");
 
 static double now_ms() { return SkTime::GetNSecs() * 1e-6; }
 
@@ -1050,6 +1052,10 @@ int nanobench_main() {
     SkTArray<Config> configs;
     create_configs(&configs);
 
+#if USE_THERMAL_MANAGER
+    ThermalManager tm;
+#endif
+
     if (FLAGS_keepAlive) {
         start_keepalive();
     }
@@ -1067,6 +1073,11 @@ int nanobench_main() {
             bench->delayedSetup();
         }
         for (int i = 0; i < configs.count(); ++i) {
+#if USE_THERMAL_MANAGER
+            if (FLAGS_useThermalManager && !tm.coolOffIfNecessary()) {
+                SkDebugf("Could not cool off, timings will be throttled\n");
+            }
+#endif
             Target* target = is_enabled(b, configs[i]);
             if (!target) {
                 continue;