[wasm] Support recompilation if deserialization fails.

include/v8.h

 // Copyright 2012 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.
 
 /** \mainpage V8 API Reference Guide
  *
  * V8 is Google's open source JavaScript engine.
  *
  * This set of documents provides reference material generated from the
  * V8 header file, include/v8.h.
@@ skipping 3884 matching lines @@
   V8_INLINE static Proxy* Cast(Value* obj);
 
  private:
   Proxy();
   static void CheckCast(Value* obj);
 };
 
 class V8_EXPORT WasmCompiledModule : public Object {
  public:
   typedef std::pair<std::unique_ptr<const uint8_t[]>, size_t> SerializedModule;
+  // Get the uncompiled bytes that were used to compile this module.
+  Local<String> GetUncompiledBytes();
 
+  // Serialize the compiled module. The serialized data does not include the
+  // uncompiled bytes.
   SerializedModule Serialize();
-  static MaybeLocal<WasmCompiledModule> Deserialize(
-      Isolate* isolate, const SerializedModule& serialized_data);

[vogelheim, 2016/10/06 10:00:50]

This is an incompatible API change, and one of the bots is complaining that
Blink won't build. You'll briefly have to support both old + new API.

+
+  // If possible, deserialize the module, otherwise compile it from the provided
+  // uncompiled bytes.
+  static MaybeLocal<WasmCompiledModule> DeserializeOrCompile(
+      Isolate* isolate, const SerializedModule& serialized_data,
+      Local<String> uncompiled_bytes);
   V8_INLINE static WasmCompiledModule* Cast(Value* obj);
 
  private:
+  static MaybeLocal<WasmCompiledModule> Compile(Isolate* isolate,
+                                                Local<String> bytes);
   WasmCompiledModule();
   static void CheckCast(Value* obj);
 };
 
 #ifndef V8_ARRAY_BUFFER_INTERNAL_FIELD_COUNT
 // The number of required internal fields can be defined by embedder.
 #define V8_ARRAY_BUFFER_INTERNAL_FIELD_COUNT 2
 #endif
 
 
@@ skipping 5729 matching lines @@
  */
 
 
 }  // namespace v8
 
 
 #undef TYPE_CHECK
 
 
 #endif  // INCLUDE_V8_H_