Avoid SpdyHeaderBlock copy in SpdyStream::OnPushPromiseHeadersReceived().

net/spdy/buffered_spdy_framer.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/spdy/buffered_spdy_framer.h"
 
 #include <utility>
 
 #include "base/logging.h"
 #include "base/strings/string_util.h"
@@ skipping 96 matching lines @@
         break;
       case SYN_REPLY:
         NOTREACHED();
         break;
       case HEADERS:
         visitor_->OnHeaders(control_frame_fields_->stream_id,
                             control_frame_fields_->has_priority,
                             control_frame_fields_->weight,
                             control_frame_fields_->parent_stream_id,
                             control_frame_fields_->exclusive,
-                            control_frame_fields_->fin, headers);
+                            control_frame_fields_->fin, std::move(headers));
         break;
       case PUSH_PROMISE:
         visitor_->OnPushPromise(control_frame_fields_->stream_id,
                                 control_frame_fields_->promised_stream_id,
-                                headers);
+                                std::move(headers));
         break;
       default:
         DCHECK(false) << "Unexpect control frame type: "
                       << control_frame_fields_->type;
         break;
     }
     control_frame_fields_.reset(NULL);
     return true;
   }
 
@@ skipping 53 matching lines @@
   }
   DCHECK(control_frame_fields_.get());
   switch (control_frame_fields_->type) {
     case SYN_STREAM:
       NOTREACHED();
       break;
     case SYN_REPLY:
       NOTREACHED();
       break;
     case HEADERS:
-      visitor_->OnHeaders(control_frame_fields_->stream_id,
-                          control_frame_fields_->has_priority,
-                          control_frame_fields_->weight,
-                          control_frame_fields_->parent_stream_id,
-                          control_frame_fields_->exclusive,
-                          control_frame_fields_->fin, coalescer_->headers());
+      visitor_->OnHeaders(
+          control_frame_fields_->stream_id, control_frame_fields_->has_priority,
+          control_frame_fields_->weight,
+          control_frame_fields_->parent_stream_id,
+          control_frame_fields_->exclusive, control_frame_fields_->fin,
+          coalescer_->release_headers());
       break;
     case PUSH_PROMISE:
       visitor_->OnPushPromise(control_frame_fields_->stream_id,
                               control_frame_fields_->promised_stream_id,
-                              coalescer_->headers());
+                              coalescer_->release_headers());
       break;
     default:
       DCHECK(false) << "Unexpect control frame type: "
                     << control_frame_fields_->type;
       break;
   }
   control_frame_fields_.reset(NULL);
 }
 
 void BufferedSpdyFramer::OnSettings(bool clear_persisted) {
@@ skipping 197 matching lines @@
 }
 
 void BufferedSpdyFramer::InitHeaderStreaming(SpdyStreamId stream_id) {
   header_buffer_.clear();
   header_buffer_valid_ = true;
   header_stream_id_ = stream_id;
   DCHECK_NE(header_stream_id_, SpdyFramer::kInvalidStream);
 }
 
 }  // namespace net