Enable Windows to load V8's initial snapshot from external files.

gin/isolate_holder.cc

Index: gin/isolate_holder.cc
diff --git a/gin/isolate_holder.cc b/gin/isolate_holder.cc
index 38215b2c9b584b9a1e3a144cca3508e6eeef9f49..a88bbfa457c19528d44ef8108705ca204919438f 100644
--- a/gin/isolate_holder.cc
+++ b/gin/isolate_holder.cc
@@ -48,9 +48,13 @@ bool MapV8Files(base::FilePath* natives_path, base::FilePath* snapshot_path,
 
   g_mapped_natives = new base::MemoryMappedFile;
   if (!g_mapped_natives->IsValid()) {
+#ifndef OS_WIN

[jochen (gone - plz use gerrit), 2015/01/09 13:40:24]

#if !defined(OS_WIN)

[rmcilroy, 2015/01/09 14:16:33]

argh, that was the one thing I planned on changing from the original CL but
forgot to after I got a merge conflict :).  Done.

     if (natives_fd == -1
         ? !g_mapped_natives->Initialize(base::File(*natives_path, flags))
         : !g_mapped_natives->Initialize(base::File(natives_fd))) {
+#else
+    if (!g_mapped_natives->Initialize(base::File(*natives_path, flags))) {
+#endif  // OS_WIN
       delete g_mapped_natives;
       g_mapped_natives = NULL;
       LOG(FATAL) << "Couldn't mmap v8 natives data file";
@@ -60,9 +64,13 @@ bool MapV8Files(base::FilePath* natives_path, base::FilePath* snapshot_path,
 
   g_mapped_snapshot = new base::MemoryMappedFile;
   if (!g_mapped_snapshot->IsValid()) {
+#ifndef OS_WIN
     if (snapshot_fd == -1
         ? !g_mapped_snapshot->Initialize(base::File(*snapshot_path, flags))
         : !g_mapped_snapshot->Initialize(base::File(snapshot_fd))) {
+#else
+    if (!g_mapped_snapshot->Initialize(base::File(*snapshot_path, flags))) {
+#endif  // OS_WIN
       delete g_mapped_snapshot;
       g_mapped_snapshot = NULL;
       LOG(ERROR) << "Couldn't mmap v8 snapshot data file";
@@ -91,6 +99,8 @@ const int v8_snapshot_dir =
     base::DIR_ANDROID_APP_DATA;
 #elif defined(OS_POSIX)
     base::DIR_EXE;
+#elif defined(OS_WIN)
+    base::DIR_MODULE;
 #endif  // OS_ANDROID
 #endif  // !OS_MACOSX