gen_snapshot now generates two snapshot buffers, one for the vm isolate

sky/engine/bindings/snapshot.cc.tmpl

Index: sky/engine/bindings/snapshot.cc.tmpl
diff --git a/sky/engine/bindings/snapshot.cc.tmpl b/sky/engine/bindings/snapshot.cc.tmpl
index f0da857d9e016b547c254e0ad4bb9dc50ea0a83a..74ca10e6cc17ceb88b2fe447d8c07b52ba1e7102 100644
--- a/sky/engine/bindings/snapshot.cc.tmpl
+++ b/sky/engine/bindings/snapshot.cc.tmpl
@@ -9,10 +9,17 @@
 namespace blink {
 
 // The string on the next line will be filled in with the contents of the
-// generated snapshot binary file.
-// This string forms the content of a snapshot which is loaded in by dart.
-static const uint8_t snapshot_buffer_[] = { % s};
+// generated snapshot binary file for the vm isolate.
+// This string forms the content of the dart vm isolate snapshot which
+// is loaded into the vm isolate.
+static const uint8_t vm_isolate_snapshot_buffer_[] = { % s};
+const uint8_t* kDartVmIsolateSnapshotBuffer = vm_isolate_snapshot_buffer_;
 
-const uint8_t* kDartSnapshotBuffer = snapshot_buffer_;
+// The string on the next line will be filled in with the contents of the
+// generated snapshot binary file for a regular dart isolate.
+// This string forms the content of a regular dart isolate snapshot which
+// is loaded into an isolate when it is created.
+static const uint8_t isolate_snapshot_buffer_[] = { % s};
+const uint8_t* kDartIsolateSnapshotBuffer = isolate_snapshot_buffer_;
 
 }  // namespace blink