Moving gRPC support interfaces out of cronet and into a new component.

net/url_request/url_request_context.h

 // 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.
 
 // This class represents contextual information (cookies, cache, etc.)
 // that's necessary when processing resource requests.
 
 #ifndef NET_URL_REQUEST_URL_REQUEST_CONTEXT_H_
 #define NET_URL_REQUEST_URL_REQUEST_CONTEXT_H_
 
@@ skipping 220 matching lines @@
   bool enable_brotli() const { return enable_brotli_; }
 
   void set_enable_referrer_policy_header(bool enable_referrer_policy_header) {
     enable_referrer_policy_header_ = enable_referrer_policy_header;
   }
 
   bool enable_referrer_policy_header() const {
     return enable_referrer_policy_header_;
   }
 
+  void DetachFromThread();
+
  private:
   // ---------------------------------------------------------------------------
   // Important: When adding any new members below, consider whether they need to
   // be added to CopyFrom.
   // ---------------------------------------------------------------------------
 
   // Ownership for these members are not defined here. Clients should either
   // provide storage elsewhere or have a subclass take ownership.
   NetLog* net_log_;
   HostResolver* host_resolver_;
@@ skipping 30 matching lines @@
   // following redirects. TODO(estark): remove this flag once
   // Referrer-Policy ships (https://crbug.com/619228).
   bool enable_referrer_policy_header_;
 
   DISALLOW_COPY_AND_ASSIGN(URLRequestContext);
 };
 
 }  // namespace net
 
 #endif  // NET_URL_REQUEST_URL_REQUEST_CONTEXT_H_