Fix for mips build

tools/ThermalManager.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "ThermalManager.h"
 
 #include "SkOSFile.h"
 
 #include <stdio.h>
 
+#ifndef SK_BUILD_FOR_WIN32
+    #include <unistd.h>
+#endif
+
 #ifdef THERMAL_MANAGER_SUPPORTED
 
 /*
  * ThermalManager is completely dependent on sysfs to monitor thermal temperatures.  In sysfs
  * thermal management is controlled by a number of thermal zones.  They are laid out as follows:
  * /sys/class/thermal/thermal_zoneN where N is the number of the thermal zone starting at 0.
  *
  * Inside each thermal_zone folder is a file called 'temp,' which has the current temperature
  * reading from the sensor in that zone, as well as 0 or more files called 'trip_point_N_temp.'
  *
@@ skipping 80 matching lines @@
     bool wouldTrip = !fDisabled && currentTemp + fThreshold >= fPoint;
 
     if (wouldTrip) {
         SkDebugf("%s/%s would trip {%d,%d,%d,%d}\n", fThermalZoneRoot.c_str(),
                  fPointName.c_str(), fBase, currentTemp, fPoint, fThreshold);
     }
     return wouldTrip;
 }
 
 #endif