Add an interface to report the amount of data after a chunked encoding....

net/http/http_chunked_decoder.cc

Index: net/http/http_chunked_decoder.cc
===================================================================
--- net/http/http_chunked_decoder.cc	(revision 28152)
+++ net/http/http_chunked_decoder.cc	(working copy)
@@ -51,7 +51,8 @@
     : chunk_remaining_(0),
       chunk_terminator_remaining_(false),
       reached_last_chunk_(false),
-      reached_eof_(false) {
+      reached_eof_(false),
+      bytes_after_eof_(0) {
 }
 
 int HttpChunkedDecoder::FilterBuf(char* buf, int buf_len) {
@@ -72,6 +73,7 @@
         chunk_terminator_remaining_ = true;
       continue;
     } else if (reached_eof_) {
+      bytes_after_eof_ += buf_len;
       break;  // Done!
     }