HTTP retry support.

net/http/http_stream_base.h

Index: net/http/http_stream_base.h
diff --git a/net/http/http_stream_base.h b/net/http/http_stream_base.h
index 76e57ef8ff883bba74882792597f4b934116e67f..c6a99056a60e104715537f71a0c5df40b795365d 100644
--- a/net/http/http_stream_base.h
+++ b/net/http/http_stream_base.h
@@ -122,6 +122,9 @@ class NET_EXPORT_PRIVATE HttpStreamBase {
   // Get the total number of bytes received from network for this stream.
   virtual int64 GetTotalReceivedBytes() const = 0;
 
+  // Get the total number of body bytes received from network for this stream.
+  virtual int64 GetReceivedBodyLength() const = 0;

[mmenke, 2014/07/22 14:57:41]

Why are these in the HttpStreamBase class, and not in HttpNetworkTransaction? 
Then you get QUIC and SPDY support for free, if we want them.

[jonnyr, 2014/07/23 08:43:05]

I could not do this in HttpNetworkTransaction since io_callback_ is used for
returning data. No actual data passes through HttpNetworkTransaction as far as I
can see.

[mmenke, 2014/07/23 15:08:40]

I'm not following why this doesn't work.  In
HttpNetworkTransaction::DoReadBodyComplete, we have result, which is the number
of body bytes read (or an error), and we have |read_buf_|.  Am I missing
something?

+
   // Populates the connection establishment part of |load_timing_info|, and
   // socket ID.  |load_timing_info| must have all null times when called.
   // Returns false and does nothing if there is no underlying connection, either
@@ -156,6 +159,16 @@ class NET_EXPORT_PRIVATE HttpStreamBase {
   // Called when the priority of the parent transaction changes.
   virtual void SetPriority(RequestPriority priority) = 0;
 
+  // If restarting a request where a part of the body has already been
+  // received, set where we should start reading from, previous content length
+  // and hash of previous response.
+  virtual void SetRestartInfo(int64 read_offset, const void* hash,
+                              size_t hash_length) = 0;
+
+  // If restarting a request where a part of the body has already been received,
+  // retrieve the hash so that this can be verified on retry.
+  virtual void GetHash(void* output, size_t hash_length) = 0;
+
  private:
   DISALLOW_COPY_AND_ASSIGN(HttpStreamBase);
 };