Create a class to represent a DOM Storage Database.

sql/statement.h

Index: sql/statement.h
diff --git a/sql/statement.h b/sql/statement.h
index c7e2c40542f90f00b71c5a84d31ea5a89e4c82d4..2d285925bb7f13f9a204a9a11adb49bfbf30cc19 100644
--- a/sql/statement.h
+++ b/sql/statement.h
@@ -126,6 +126,7 @@ class SQL_EXPORT Statement {
   // where that type is not the native type. For safety, call ColumnType only
   // on a column before getting the value out in any way.
   ColType ColumnType(int col) const;
+  ColType DeclaredColumnType(int col) const;
 
   // These all take a 0-based argument index.
   bool ColumnBool(int col) const;
@@ -141,6 +142,7 @@ class SQL_EXPORT Statement {
   int ColumnByteLength(int col) const;
   const void* ColumnBlob(int col) const;
   bool ColumnBlobAsString(int col, std::string* blob);
+  bool ColumnBlobAsString16(int col, string16* val) const;
   bool ColumnBlobAsVector(int col, std::vector<char>* val) const;
   bool ColumnBlobAsVector(int col, std::vector<unsigned char>* val) const;