Implement padding for SPDY4/HTTP2 DATA frames.

net/spdy/spdy_framer.h

Index: net/spdy/spdy_framer.h
diff --git a/net/spdy/spdy_framer.h b/net/spdy/spdy_framer.h
index f3cd98f9828b8f90bcf2014d21bbac62f36f97d4..44918e290c4a589ca9fd4a08d1bcf12d49ff781c 100644
--- a/net/spdy/spdy_framer.h
+++ b/net/spdy/spdy_framer.h
@@ -281,6 +281,8 @@ class NET_EXPORT_PRIVATE SpdyFramer {
     SPDY_AUTO_RESET,
     SPDY_READING_COMMON_HEADER,
     SPDY_CONTROL_FRAME_PAYLOAD,
+    SPDY_READ_PADDING_LENGTH,
+    SPDY_CONSUME_PADDING,
     SPDY_IGNORE_REMAINING_PAYLOAD,
     SPDY_FORWARD_STREAM_FRAME,
     SPDY_CONTROL_FRAME_BEFORE_HEADER_BLOCK,
@@ -544,6 +546,8 @@ class NET_EXPORT_PRIVATE SpdyFramer {
   size_t ProcessControlFrameHeaderBlock(const char* data,
                                         size_t len,
                                         bool is_hpack_header_block);
+  size_t ProcessFramePaddingLength(const char* data, size_t len);
+  size_t ProcessFramePadding(const char* data, size_t len);
   size_t ProcessDataFramePayload(const char* data, size_t len);
   size_t ProcessGoAwayFramePayload(const char* data, size_t len);
   size_t ProcessRstStreamFramePayload(const char* data, size_t len);
@@ -628,8 +632,18 @@ class NET_EXPORT_PRIVATE SpdyFramer {
   SpdyState state_;
   SpdyState previous_state_;
   SpdyError error_code_;
+
+  // Note that for DATA frame, remaining_data_length_ is sum of lengths of
+  // frame header, padding length field (optional), data payload (optional) and
+  // padding payload (optional).
   size_t remaining_data_length_;
 
+  // The length (in bytes) of the padding payload to be processed.
+  size_t remaining_padding_payload_length_;
+
+  // The length (in bytes) of the padding length field to be processed.
+  size_t remaining_padding_length_fields_;
+
   // The number of bytes remaining to read from the current control frame's
   // headers. Note that header data blocks (for control types that have them)
   // are part of the frame's payload, and not the frame's headers.