Wrap large IndexedDB values into Blobs before writing to LevelDB.

third_party/WebKit/Source/modules/indexeddb/IDBValue.h

Index: third_party/WebKit/Source/modules/indexeddb/IDBValue.h
diff --git a/third_party/WebKit/Source/modules/indexeddb/IDBValue.h b/third_party/WebKit/Source/modules/indexeddb/IDBValue.h
index a0be459aaa9be7b3c69a69b5be173627d230c28e..0cc0811085b72ab1209587dd2d79c8f0b2288f08 100644
--- a/third_party/WebKit/Source/modules/indexeddb/IDBValue.h
+++ b/third_party/WebKit/Source/modules/indexeddb/IDBValue.h
@@ -10,6 +10,7 @@
 #include "modules/indexeddb/IDBKey.h"
 #include "modules/indexeddb/IDBKeyPath.h"
 #include "platform/SharedBuffer.h"
+#include "platform/wtf/PassRefPtr.h"
 #include "platform/wtf/RefPtr.h"
 #include "public/platform/WebVector.h"
 
@@ -37,6 +38,8 @@ class MODULES_EXPORT IDBValue final : public RefCounted<IDBValue> {
   const IDBKeyPath& KeyPath() const { return key_path_; }
 
  private:
+  friend class IDBValueUnwrapper;
+
   IDBValue();
   IDBValue(const WebIDBValue&, v8::Isolate*);
   IDBValue(PassRefPtr<SharedBuffer>,
@@ -45,6 +48,11 @@ class MODULES_EXPORT IDBValue final : public RefCounted<IDBValue> {
            const IDBKeyPath&);
   IDBValue(const IDBValue*, IDBKey*, const IDBKeyPath&);
 
+  // Used by IDBValueUnwrapper.
+  IDBValue(PassRefPtr<SharedBuffer> unwrapped_data,
+           std::unique_ptr<Vector<RefPtr<BlobDataHandle>>>,
+           std::unique_ptr<Vector<WebBlobInfo>>);
+
   // Keep this private to prevent new refs because we manually bookkeep the
   // memory to V8.
   const RefPtr<SharedBuffer> data_;