Serializer: move to a subfolder and clean up includes.

src/snapshot/mksnapshot.cc

Index: src/snapshot/mksnapshot.cc
diff --git a/src/mksnapshot.cc b/src/snapshot/mksnapshot.cc
similarity index 97%
rename from src/mksnapshot.cc
rename to src/snapshot/mksnapshot.cc
index 450dfac8a94ee0ba01aa652044a0d7755824a3c8..79c1643fb810ed6d7f3eda64942b6d475ad93d33 100644
--- a/src/mksnapshot.cc
+++ b/src/snapshot/mksnapshot.cc
@@ -14,8 +14,8 @@
 #include "src/bootstrapper.h"
 #include "src/flags.h"
 #include "src/list.h"
-#include "src/natives.h"
-#include "src/serialize.h"
+#include "src/snapshot/natives.h"
+#include "src/snapshot/serialize.h"
 
 
 using namespace v8;
@@ -64,7 +64,7 @@ class SnapshotWriter {
     fprintf(fp_, "// Autogenerated snapshot file. Do not edit.\n\n");
     fprintf(fp_, "#include \"src/v8.h\"\n");
     fprintf(fp_, "#include \"src/base/platform/platform.h\"\n\n");
-    fprintf(fp_, "#include \"src/snapshot.h\"\n\n");
+    fprintf(fp_, "#include \"src/snapshot/snapshot.h\"\n\n");
     fprintf(fp_, "namespace v8 {\n");
     fprintf(fp_, "namespace internal {\n\n");
   }