Fixed compilation on mingw.

src/core/SkTime.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkOncePtr.h"
 #include "SkString.h"
 #include "SkTime.h"
@@ skipping 10 matching lines @@
                     static_cast<unsigned>(fDay), static_cast<unsigned>(fHour),
                     static_cast<unsigned>(fMinute),
                     static_cast<unsigned>(fSecond), timezoneSign, timeZoneHours,
                     timeZoneMinutes);
     }
 }
 
 
 #ifdef SK_BUILD_FOR_WIN32
 
-#include "Windows.h"
+#include "windows.h"
 void SkTime::GetDateTime(DateTime* dt) {
     if (dt) {
         SYSTEMTIME st;
         GetSystemTime(&st);
         dt->fTimeZoneMinutes = 0;
         dt->fYear       = st.wYear;
         dt->fMonth      = SkToU8(st.wMonth);
         dt->fDayOfWeek  = SkToU8(st.wDayOfWeek);
         dt->fDay        = SkToU8(st.wDay);
         dt->fHour       = SkToU8(st.wHour);
@@ skipping 50 matching lines @@
 #else
     // This std::chrono code looks great on Linux and Android,
     // but MSVC 2013 returned mostly garbage (0ns times, etc).
     #include <chrono>
     double SkTime::GetNSecs() {
         auto now = std::chrono::high_resolution_clock::now();
         std::chrono::duration<double, std::nano> ns = now.time_since_epoch();
         return ns.count();
     }
 #endif