Patch for allowing several V8 instances in process:...

src/compilation-cache.h

Index: src/compilation-cache.h
===================================================================
--- src/compilation-cache.h	(revision 3427)
+++ src/compilation-cache.h	(working copy)
@@ -31,7 +31,20 @@
 namespace v8 {
 namespace internal {
 
+class CompilationCachePrivateData;
 
+class CompilationCacheData {
+ public:
+  CompilationCachePrivateData& private_data_;
+ private:
+  CompilationCacheData();
+  ~CompilationCacheData();
+
+  friend class V8Context;
+  friend class CompilationCache;
+  DISALLOW_COPY_AND_ASSIGN(CompilationCacheData);
+};
+
 // The compilation cache keeps function boilerplates for compiled
 // scripts and evals. The boilerplates are looked up using the source
 // string as the key. For regular expressions the compilation data is cached.