Issue 172109: Enable scavenging in RenderThread::IdleHandler....

third_party/tcmalloc/config_win.h

 /* A manual version of config.h fit for windows machines. */
 
 /* Sometimes we accidentally #include this config.h instead of the one
    in .. -- this is particularly true for msys/mingw, which uses the
    unix config.h but also runs code in the windows directory.
    */
 #ifdef __MINGW32__
 #include "../config.h"
 #define GOOGLE_PERFTOOLS_WINDOWS_CONFIG_H_
 #endif
@@ skipping 47 matching lines @@
 #undef HAVE_DECL_UNAME
 
 /* Define to 1 if you have the declaration of `valloc', and to 0 if you don't.
    */
 #undef HAVE_DECL_VALLOC
 
 /* Define to 1 if you prefer to defer decommitting pages
    (on OSes which have ability) which could be performed offline
    (either by background thread or in idle time.)
    */
-#define DEFER_DECOMMIT 0
+#define DEFER_DECOMMIT 1
 
 /* Define to 1 if you have the <dlfcn.h> header file. */
 #undef HAVE_DLFCN_H
 
 /* Define to 1 if the system has the type `Elf32_Versym'. */
 #undef HAVE_ELF32_VERSYM
 
 /* Define to 1 if you have the <execinfo.h> header file. */
 #undef HAVE_EXECINFO_H
 
@@ skipping 185 matching lines @@
 // This must be defined before the windows.h is included.  It's needed
 // for mutex.h, to give access to the TryLock method.
 #ifndef _WIN32_WINNT
 # define _WIN32_WINNT 0x0400
 #endif
 
 // TODO(csilvers): include windows/port.h in every relevant source file instead?
 #include "windows/port.h"
 
 #endif  /* GOOGLE_PERFTOOLS_WINDOWS_CONFIG_H_ */