Refactor ScriptData class for cached compile data.

src/snapshot-source-sink.h

Index: src/snapshot-source-sink.h
diff --git a/src/snapshot-source-sink.h b/src/snapshot-source-sink.h
index eae8606fbed11f31ff124b66518a9ff19d083292..f98b5d0a4e0283ab1d717ecde0ac4227c6bf66f2 100644
--- a/src/snapshot-source-sink.h
+++ b/src/snapshot-source-sink.h
@@ -71,9 +71,10 @@ class SnapshotByteSource V8_FINAL {
 class SnapshotByteSink {
  public:
   virtual ~SnapshotByteSink() { }
-  virtual void Put(int byte, const char* description) = 0;
-  virtual void PutSection(int byte, const char* description) {
-    Put(byte, description);
+  virtual void Put(byte b, const char* description) = 0;
+  virtual void PutSection(int b, const char* description) {
+    ASSERT_LE(b, kMaxUInt8);
+    Put(static_cast<byte>(b), description);
   }
   void PutInt(uintptr_t integer, const char* description);
   void PutRaw(byte* data, int number_of_bytes, const char* description);
@@ -86,7 +87,7 @@ class DummySnapshotSink : public SnapshotByteSink {
  public:
   DummySnapshotSink() : length_(0) {}
   virtual ~DummySnapshotSink() {}
-  virtual void Put(int byte, const char* description) { length_++; }
+  virtual void Put(byte b, const char* description) { length_++; }
   virtual int Position() { return length_; }
 
  private:
@@ -98,7 +99,7 @@ class DummySnapshotSink : public SnapshotByteSink {
 class DebugSnapshotSink : public SnapshotByteSink {
  public:
   explicit DebugSnapshotSink(SnapshotByteSink* chained) : sink_(chained) {}
-  virtual void Put(int byte, const char* description) V8_OVERRIDE;
+  virtual void Put(byte b, const char* description) V8_OVERRIDE;
   virtual int Position() V8_OVERRIDE { return sink_->Position(); }
 
  private:
@@ -108,14 +109,14 @@ class DebugSnapshotSink : public SnapshotByteSink {
 
 class ListSnapshotSink : public i::SnapshotByteSink {
  public:
-  explicit ListSnapshotSink(i::List<char>* data) : data_(data) {}
-  virtual void Put(int byte, const char* description) V8_OVERRIDE {
-    data_->Add(byte);
+  explicit ListSnapshotSink(i::List<byte>* data) : data_(data) {}
+  virtual void Put(byte b, const char* description) V8_OVERRIDE {
+    data_->Add(b);
   }
   virtual int Position() V8_OVERRIDE { return data_->length(); }
 
  private:
-  i::List<char>* data_;
+  i::List<byte>* data_;
 };
 
 }  // namespace v8::internal