Add missing MappedHostResolver overrides

Save for remapping hosts according to the rules, MappedHostResolver
should be a transparent wrapper around the "real" resolver.  Thus, it
must forward all HostResolver methods to the real resolver.

Change-Id: I34deed523b3cb690d450599c89bfd7f2184e843d
Reviewed-on: https://chromium-review.googlesource.com/1209402
Commit-Queue: Wojciech Dzierżanowski <wdzierzanowski@opera.com>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589150}

net/dns/mapped_host_resolver.cc

@@ -114,6 +114,24 @@ bool MappedHostResolver::GetNoIPv6OnWifi() {
   return impl_->GetNoIPv6OnWifi();
 }
 
+void MappedHostResolver::SetRequestContext(URLRequestContext* request_context) {
+  impl_->SetRequestContext(request_context);
+}
+
+void MappedHostResolver::AddDnsOverHttpsServer(std::string spec,
+                                               bool use_post) {
+  impl_->AddDnsOverHttpsServer(spec, use_post);
+}
+
+void MappedHostResolver::ClearDnsOverHttpsServers() {
+  impl_->ClearDnsOverHttpsServers();
+}
+
+const std::vector<DnsConfig::DnsOverHttpsServerConfig>*
+MappedHostResolver::GetDnsOverHttpsServersForTesting() const {
+  return impl_->GetDnsOverHttpsServersForTesting();
+}
+
 int MappedHostResolver::ApplyRules(RequestInfo* info) const {
   HostPortPair host_port(info->host_port_pair());
   if (rules_.RewriteHost(&host_port)) {

net/dns/mapped_host_resolver.h

@@ -7,6 +7,7 @@
 
 #include <memory>
 #include <string>
+#include <vector>
 
 #include "net/base/completion_once_callback.h"
 #include "net/base/host_mapping_rules.h"
@@ -65,15 +66,18 @@ class NET_EXPORT MappedHostResolver : public HostResolver {
                             HostCache::EntryStaleness* stale_info,
                             const NetLogWithSource& source_net_log) override;
   void SetDnsClientEnabled(bool enabled) override;
-
   HostCache* GetHostCache() override;
   bool HasCached(base::StringPiece hostname,
                  HostCache::Entry::Source* source_out,
                  HostCache::EntryStaleness* stale_out) const override;
-
   std::unique_ptr<base::Value> GetDnsConfigAsValue() const override;
   void SetNoIPv6OnWifi(bool no_ipv6_on_wifi) override;
   bool GetNoIPv6OnWifi() override;
+  void SetRequestContext(URLRequestContext* request_context) override;
+  void AddDnsOverHttpsServer(std::string spec, bool use_post) override;
+  void ClearDnsOverHttpsServers() override;
+  const std::vector<DnsConfig::DnsOverHttpsServerConfig>*
+  GetDnsOverHttpsServersForTesting() const override;
 
  private:
   class AlwaysErrorRequestImpl;