Add support for startup data (snapshot) compression.

src/snapshot.h

Index: src/snapshot.h
diff --git a/src/snapshot.h b/src/snapshot.h
index bedd186e507118f568b7a534669fc81cd0046203..0a07046a504f2237b4368e51cf448940a528d2f0 100644
--- a/src/snapshot.h
+++ b/src/snapshot.h
@@ -50,9 +50,25 @@ STATIC_CLASS Snapshot {
   // successfully.
   static bool WriteToFile(const char* snapshot_file);
 
+  static const byte* data() { return data_; }
+  static int size() { return size_; }
+  static int decompressed_size() { return decompressed_size_; }
+  static void set_decompressed_data(const byte* decompressed_data) {
+    decompressed_data_ = decompressed_data;
+  }
+  static const byte* context_data() { return context_data_; }
+  static int context_size() { return context_size_; }
+  static int context_decompressed_size() { return context_decompressed_size_; }
+  static void set_context_decompressed_data(
+      const byte* context_decompressed_data) {
+    context_decompressed_data_ = context_decompressed_data;
+  }
+
  private:
   static const byte data_[];
+  static const byte* decompressed_data_;
   static const byte context_data_[];
+  static const byte* context_decompressed_data_;
   static const int new_space_used_;
   static const int pointer_space_used_;
   static const int data_space_used_;
@@ -61,7 +77,9 @@ STATIC_CLASS Snapshot {
   static const int cell_space_used_;
   static const int large_space_used_;
   static const int size_;
+  static const int decompressed_size_;
   static const int context_size_;
+  static const int context_decompressed_size_;
 
   static bool Deserialize(const byte* content, int len);