Add methods to enable configuration of ResourceConstraints based on limits derived at runtime.

src/platform-win32.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1190 matching lines @@
   if (!LoadDbgHelpAndTlHelp32()) return;
   HANDLE process_handle = GetCurrentProcess();
   LoadSymbols(isolate, process_handle);
 }
 
 
 void OS::SignalCodeMovingGC() {
 }
 
 
+uint64_t OS::TotalPhysicalMemory() {
+  MEMORYSTATUSEX memory_info;
+  memory_info.dwLength = sizeof(memory_info);
+  if (!GlobalMemoryStatusEx(&memory_info)) {
+    UNREACHABLE();
+    return 0;
+  }
+
+  return static_cast<uint64_t>(memory_info.ullTotalPhys);
+}
+
+
 #else  // __MINGW32__
 void OS::LogSharedLibraryAddresses(Isolate* isolate) { }
 void OS::SignalCodeMovingGC() { }
 #endif  // __MINGW32__
 
 
 uint64_t OS::CpuFeaturesImpliedByPlatform() {
   return 0;  // Windows runs on anything.
 }
 
@@ skipping 224 matching lines @@
   ASSERT(result);
 }
 
 
 
 void Thread::YieldCPU() {
   Sleep(0);
 }
 
 } }  // namespace v8::internal