This is the implementation of the primary and secondary blob journals for

content/browser/indexed_db/indexed_db_leveldb_coding.h

Index: content/browser/indexed_db/indexed_db_leveldb_coding.h
diff --git a/content/browser/indexed_db/indexed_db_leveldb_coding.h b/content/browser/indexed_db/indexed_db_leveldb_coding.h
index a86d53f77fc641c595e41a8b1faee0d038b6dafa..e796795d1b6e3d1397077d9a1e562debc905e532 100644
--- a/content/browser/indexed_db/indexed_db_leveldb_coding.h
+++ b/content/browser/indexed_db/indexed_db_leveldb_coding.h
@@ -23,6 +23,10 @@ CONTENT_EXPORT extern const unsigned char kMinimumIndexId;
 CONTENT_EXPORT std::string MaxIDBKey();
 CONTENT_EXPORT std::string MinIDBKey();
 
+// DatabaseId, BlobKey
+typedef std::pair<int64_t, int64_t> BlobJournalEntryType;
+typedef std::vector<BlobJournalEntryType> BlobJournalType;
+
 CONTENT_EXPORT void EncodeByte(unsigned char value, std::string* into);
 CONTENT_EXPORT void EncodeBool(bool value, std::string* into);
 CONTENT_EXPORT void EncodeInt(int64 value, std::string* into);
@@ -36,6 +40,8 @@ CONTENT_EXPORT void EncodeDouble(double value, std::string* into);
 CONTENT_EXPORT void EncodeIDBKey(const IndexedDBKey& value, std::string* into);
 CONTENT_EXPORT void EncodeIDBKeyPath(const IndexedDBKeyPath& value,
                                      std::string* into);
+CONTENT_EXPORT void EncodeBlobJournal(const BlobJournalType& journal,
+                                      std::string* into);
 
 CONTENT_EXPORT WARN_UNUSED_RESULT bool DecodeByte(base::StringPiece* slice,
                                                   unsigned char* value);
@@ -60,6 +66,9 @@ CONTENT_EXPORT WARN_UNUSED_RESULT bool DecodeIDBKey(
 CONTENT_EXPORT WARN_UNUSED_RESULT bool DecodeIDBKeyPath(
     base::StringPiece* slice,
     IndexedDBKeyPath* value);
+CONTENT_EXPORT WARN_UNUSED_RESULT bool DecodeBlobJournal(
+    base::StringPiece* slice,
+    BlobJournalType* journal);
 
 CONTENT_EXPORT int CompareEncodedStringsWithLength(base::StringPiece* slice1,
                                                    base::StringPiece* slice2,