IPC Fuzzer: Minor fuzz traits updates.

tools/ipc_fuzzer/fuzzer/fuzzer.cc

 // Copyright 2015 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 <iostream>
 #include <set>
 #include <string>
 #include <utility>
 #include <vector>
 
@@ skipping 1256 matching lines @@
       random_url = std::string("file://") + random_url;
     else if (selector == 2)
       random_url = std::string("javascript:") + random_url;
     else if (selector == 2)
       random_url = std::string("data:") + random_url;
     *p = GURL(random_url);
     return true;
   }
 };
 
+template <>
+struct FuzzTraits<HostID> {
+  static bool Fuzz(HostID* p, Fuzzer* fuzzer) {
+    HostID::HostType type = p->type();
+    std::string id = p->id();
+    if (!FuzzParam(&type, fuzzer))
+      return false;
+    if (!FuzzParam(&id, fuzzer))
+      return false;
+    *p = HostID(type, id);
+    return true;
+  }
+};
+
 #if defined(OS_WIN)
 template <>
 struct FuzzTraits<HWND> {
   static bool Fuzz(HWND* p, Fuzzer* fuzzer) {
     // TODO(aarya): This should actually do something.
     return true;
   }
 };
 #endif
 
@@ skipping 781 matching lines @@
 #include "ipc/ipc_message_null_macros.h"
 #undef IPC_MESSAGE_DECL
 #define IPC_MESSAGE_DECL(kind, type, name, in, out, ilist, olist) \
   (*map)[static_cast<uint32>(name::ID)] = fuzzer_for_##name;
 
 void PopulateFuzzerFunctionMap(FuzzerFunctionMap* map) {
 #include "tools/ipc_fuzzer/message_lib/all_messages.h"
 }
 
 }  // namespace ipc_fuzzer