Support external startup data in V8.

src/snapshot.h

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "isolate.h"
 
 #ifndef V8_SNAPSHOT_H_
 #define V8_SNAPSHOT_H_
 
 namespace v8 {
 namespace internal {
 
 class Snapshot {
  public:
-  // Initialize the VM from the given snapshot file. If snapshot_file is
-  // NULL, use the internal snapshot instead. Returns false if no snapshot
+  // Initialize the VM from the internal snapshot. Returns false if no snapshot
   // could be found.
-  static bool Initialize(const char* snapshot_file = NULL);
+  static bool Initialize();
 
   static bool HaveASnapshotToStartFrom();
 
   // Create a new context using the internal partial snapshot.
   static Handle<Context> NewContextFromSnapshot(Isolate* isolate);
 
   // Returns whether or not the snapshot is enabled.
-  static bool IsEnabled() { return size_ != 0; }
+  static bool IsEnabled();
 
-  // Write snapshot to the given file. Returns true if snapshot was written
-  // successfully.
-  static bool WriteToFile(const char* snapshot_file);
-
+  // These methods support COMPRESS_STARTUP_DATA_BZ2.
   static const byte* data() { return data_; }
   static int size() { return size_; }
   static int raw_size() { return raw_size_; }
   static void set_raw_data(const byte* raw_data) {
     raw_data_ = raw_data;
   }
   static const byte* context_data() { return context_data_; }
   static int context_size() { return context_size_; }
   static int context_raw_size() { return context_raw_size_; }
   static void set_context_raw_data(
@@ skipping 23 matching lines @@
   static const int size_;
   static const int raw_size_;
   static const int context_size_;
   static const int context_raw_size_;
 
   static void ReserveSpaceForLinkedInSnapshot(Deserializer* deserializer);
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(Snapshot);
 };
 
+#ifdef V8_USE_EXTERNAL_STARTUP_DATA
+void SetSnapshotFromFile(StartupData* snapshot_blob);
+#endif
+
 } }  // namespace v8::internal
 
 #endif  // V8_SNAPSHOT_H_