Move platform abstraction to base library

src/base/platform/platform-cygwin.cc

Index: src/base/platform/platform-cygwin.cc
diff --git a/src/platform-cygwin.cc b/src/base/platform/platform-cygwin.cc
similarity index 98%
rename from src/platform-cygwin.cc
rename to src/base/platform/platform-cygwin.cc
index ac313b2a0348e16a78d672c5ba8b15cf686bba68..a351f13e67dd16d7a951e95b68f1743b8283dc1e 100644
--- a/src/platform-cygwin.cc
+++ b/src/base/platform/platform-cygwin.cc
@@ -18,12 +18,12 @@
 
 #undef MAP_TYPE
 
+#include "src/base/macros.h"
+#include "src/base/platform/platform.h"
 #include "src/base/win32-headers.h"
-#include "src/platform.h"
-#include "src/utils.h"
 
 namespace v8 {
-namespace internal {
+namespace base {
 
 
 const char* OS::LocalTimezone(double time, TimezoneCache* cache) {
@@ -328,4 +328,4 @@ bool VirtualMemory::HasLazyCommits() {
   return false;
 }
 
-} }  // namespace v8::internal
+} }  // namespace v8::base