Add a Dns preresolve interface in //content

chrome/browser/net/predictor.h

Index: chrome/browser/net/predictor.h
diff --git a/chrome/browser/net/predictor.h b/chrome/browser/net/predictor.h
index 78348757f3461ffee28a6a258b9efa6a81acc602..214f36cb0141df78647636e5807cef3953426bd8 100644
--- a/chrome/browser/net/predictor.h
+++ b/chrome/browser/net/predictor.h
@@ -25,7 +25,6 @@
 #include <map>
 #include <memory>
 #include <queue>
-#include <set>
 #include <string>
 #include <vector>
 
@@ -277,10 +276,6 @@ class Predictor {
   static GURL CanonicalizeUrl(const GURL& url);
 
   // Used for testing.
-  void SetHostResolver(net::HostResolver* host_resolver) {
-    host_resolver_ = host_resolver;
-  }
-  // Used for testing.
   void SetTransportSecurityState(
       net::TransportSecurityState* transport_security_state) {
     transport_security_state_ = transport_security_state;
@@ -316,6 +311,11 @@ class Predictor {
     return url_request_context_getter_.get();
   }
 
+  void set_url_request_context_getter_for_test(
+      scoped_refptr<net::URLRequestContextGetter> getter) {
+    url_request_context_getter_.swap(getter);
+  }
+
  private:
   FRIEND_TEST_ALL_PREFIXES(PredictorBrowserTest,
                            ShutdownWhenResolutionIsPendingTest);
@@ -335,8 +335,6 @@ class Predictor {
   friend class WaitForResolutionHelper;  // For testing.
   friend class PredictorBrowserTest;
 
-  class LookupRequest;
-
   // A simple priority queue for handling host names.
   // Some names that are queued up have |motivation| that requires very rapid
   // handling.  For example, a sub-resource name lookup MUST be done before the
@@ -457,11 +455,10 @@ class Predictor {
                                 const GURL& first_party_for_cookies);
 
   // Access method for use by async lookup request to pass resolution result.
-  void OnLookupFinished(LookupRequest* request, const GURL& url, bool found);
+  void OnLookupFinished(const GURL& url, int result);
 
   // Underlying method for both async and synchronous lookup to update state.
-  void LookupFinished(LookupRequest* request,
-                      const GURL& url, bool found);
+  void LookupFinished(const GURL& url, bool found);
 
   // Queue hostname for resolution.  If queueing was done, return the pointer
   // to the queued instance, otherwise return NULL. If the proxy advisor is
@@ -539,7 +536,7 @@ class Predictor {
   // results_ contains information for existing/prior prefetches.
   Results results_;
 
-  std::set<LookupRequest*> pending_lookups_;
+  size_t num_pending_lookups_;
 
   // For testing, to verify that we don't exceed the limit.
   size_t peak_pending_lookups_;
@@ -557,9 +554,6 @@ class Predictor {
   // reduction mode, and discard all queued (but not yet assigned) resolutions.
   const base::TimeDelta max_dns_queue_delay_;
 
-  // The host resolver we warm DNS entries for.
-  net::HostResolver* host_resolver_;
-
   // The TransportSecurityState instance we query HSTS redirects from.
   net::TransportSecurityState* transport_security_state_;