[standalone] Automatically decompress gzip'd resources, including sources and script snapshots.

runtime/bin/snapshot_utils.cc

 // Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "bin/snapshot_utils.h"
 
 #include "bin/dartutils.h"
 #include "bin/error_exit.h"
 #include "bin/extensions.h"
 #include "bin/file.h"
@@ skipping 241 matching lines @@
                               const uint8_t* buffer,
                               const intptr_t size) {
   File* file = File::Open(filename, File::kWriteTruncate);
   if (file == NULL) {
     ErrorExit(kErrorExitCode, "Unable to open file %s for writing snapshot\n",
               filename);
   }
 
   if (write_magic_number) {
     // Write the magic number to indicate file is a script snapshot.
-    DartUtils::WriteMagicNumber(file);
+    DartUtils::WriteSnapshotMagicNumber(file);
   }
 
   if (!file->WriteFully(buffer, size)) {
     ErrorExit(kErrorExitCode, "Unable to write file %s for writing snapshot\n",
               filename);
   }
   file->Release();
 }
 
 static bool WriteInt64(File* file, int64_t size) {
@@ skipping 123 matching lines @@
   Dart_Handle result =
       Dart_CreateAppAOTSnapshotAsAssembly(&assembly_buffer, &assembly_size);
   if (Dart_IsError(result)) {
     ErrorExit(kErrorExitCode, "%s\n", Dart_GetError(result));
   }
   WriteSnapshotFile(snapshot_filename, false, assembly_buffer, assembly_size);
 }
 
 }  // namespace bin
 }  // namespace dart