Fix ConsoleEncoding to delegate all virtuals

ConsoleEncoding is supposed to pass through all calls to the Encoding it wraps, replacing only GetPreamble, but it was missing several, as discovered while writing some new tests.  This just adds the missing overrides.

Author: stephentoub

src/System.Console/src/System/Text/ConsoleEncoding.cs

@@ -22,6 +22,21 @@ public override byte[] GetPreamble()
             return Array.Empty<byte>();
         }
 
+        public override int CodePage
+        {
+            get { return _encoding.CodePage; }
+        }
+
+        public override bool IsSingleByte
+        {
+            get { return _encoding.IsSingleByte; }
+        }
+
+        public override string EncodingName
+        {
+            get { return _encoding.EncodingName; }
+        }
+
         public override string WebName
         {
             get { return _encoding.WebName; }
@@ -32,6 +47,11 @@ public override int GetByteCount(char[] chars)
             return _encoding.GetByteCount(chars);
         }
 
+        public override unsafe int GetByteCount(char* chars, int count)
+        {
+            return _encoding.GetByteCount(chars, count);
+        }
+
         public override int GetByteCount(char[] chars, int index, int count)
         {
             return _encoding.GetByteCount(chars, index, count);
@@ -42,6 +62,11 @@ public override int GetByteCount(string s)
             return _encoding.GetByteCount(s);
         }
 
+        public override unsafe int GetBytes(char* chars, int charCount, byte* bytes, int byteCount)
+        {
+            return _encoding.GetBytes(chars, charCount, bytes, byteCount);
+        }
+
         public override byte[] GetBytes(char[] chars)
         {
             return _encoding.GetBytes(chars);
@@ -67,6 +92,11 @@ public override int GetBytes(string s, int charIndex, int charCount, byte[] byte
             return _encoding.GetBytes(s, charIndex, charCount, bytes, byteIndex);
         }
 
+        public override unsafe int GetCharCount(byte* bytes, int count)
+        {
+            return _encoding.GetCharCount(bytes, count);
+        }
+
         public override int GetCharCount(byte[] bytes)
         {
             return _encoding.GetCharCount(bytes);
@@ -77,6 +107,11 @@ public override int GetCharCount(byte[] bytes, int index, int count)
             return _encoding.GetCharCount(bytes, index, count);
         }
 
+        public override unsafe int GetChars(byte* bytes, int byteCount, char* chars, int charCount)
+        {
+            return _encoding.GetChars(bytes, byteCount, chars, charCount);
+        }
+
         public override char[] GetChars(byte[] bytes)
         {
             return _encoding.GetChars(bytes);
@@ -112,9 +147,14 @@ public override int GetMaxCharCount(int byteCount)
             return _encoding.GetMaxCharCount(byteCount);
         }
 
+        public override string GetString(byte[] bytes)
+        {
+            return _encoding.GetString(bytes);
+        }
+
         public override string GetString(byte[] bytes, int index, int count)
         {
             return _encoding.GetString(bytes, index, count);
         }
     }
-}
+}