Add an additional per-request DNS cache when executing FindProxyForURL() from...

net/proxy/proxy_resolver_js_bindings.h

 // Copyright (c) 2009 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.
 
-#ifndef NET_PROXY_PROXY_JS_BINDINGS_H
-#define NET_PROXY_PROXY_JS_BINDINGS_H
+#ifndef NET_PROXY_PROXY_RESOLVER_JS_BINDINGS_H_
+#define NET_PROXY_PROXY_RESOLVER_JS_BINDINGS_H_
 
 #include <string>
 
 class MessageLoop;
 
 namespace net {
 
 class HostResolver;
+struct ProxyResolverRequestContext;
 
 // Interface for the javascript bindings.
 class ProxyResolverJSBindings {
  public:
+  ProxyResolverJSBindings() : current_request_context_(NULL) {}
+
   virtual ~ProxyResolverJSBindings() {}
 
   // Handler for "alert(message)"
   virtual void Alert(const std::string& message) = 0;
 
   // Handler for "myIpAddress()". Returns empty string on failure.
   virtual std::string MyIpAddress() = 0;
 
   // Handler for "myIpAddressEx()". Returns empty string on failure.
   //
@@ skipping 14 matching lines @@
   // if a line number is not applicable to this error.
   virtual void OnError(int line_number, const std::string& error) = 0;
 
   // Creates a default javascript bindings implementation that will:
   //   - Send script error messages to LOG(INFO)
   //   - Send script alert()s to LOG(INFO)
   //   - Use the provided host resolver to service dnsResolve().
   //
   // Note that |host_resolver| will be used in sync mode mode.
   static ProxyResolverJSBindings* CreateDefault(HostResolver* host_resolver);
+
+  // Sets details about the currently executing FindProxyForURL() request.
+  void set_current_request_context(
+      ProxyResolverRequestContext* current_request_context) {
+    current_request_context_ = current_request_context;
+  }
+
+  // Retrieves details about the currently executing FindProxyForURL() request.
+  ProxyResolverRequestContext* current_request_context() {
+    return current_request_context_;
+  }
+
+ private:
+  ProxyResolverRequestContext* current_request_context_;
 };
 
 }  // namespace net
 
-#endif  // NET_PROXY_PROXY_JS_BINDINGS_H
+#endif  // NET_PROXY_PROXY_RESOLVER_JS_BINDINGS_H_