Don't cap num_cores at 32 on 32-bit Windows.

src/core/SkTaskGroup.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkOnce.h"
 #include "SkRunnable.h"
 #include "SkSemaphore.h"
 #include "SkSpinlock.h"
 #include "SkTDArray.h"
 #include "SkTaskGroup.h"
 #include "SkThreadUtils.h"
 
 #if defined(SK_BUILD_FOR_WIN32)
     static void query_num_cores(int* num_cores) {
         SYSTEM_INFO sysinfo;
-        GetSystemInfo(&sysinfo);
+        GetNativeSystemInfo(&sysinfo);
         *num_cores = sysinfo.dwNumberOfProcessors;
     }
 #else
     #include <unistd.h>
     static void query_num_cores(int* num_cores) {
         *num_cores = (int)sysconf(_SC_NPROCESSORS_ONLN);
     }
 #endif
 
 // We cache sk_num_cores() so we only query the OS once.
@@ skipping 184 matching lines @@
 
 SkTaskGroup::SkTaskGroup() : fPending(0) {}
 
 void SkTaskGroup::wait()                            { ThreadPool::Wait(&fPending); }
 void SkTaskGroup::add(SkRunnable* task)             { ThreadPool::Add(task, &fPending); }
 void SkTaskGroup::add(void (*fn)(void*), void* arg) { ThreadPool::Add(fn, arg, &fPending); }
 void SkTaskGroup::batch (void (*fn)(void*), void* args, int N, size_t stride) {
     ThreadPool::Batch(fn, args, N, stride, &fPending);
 }