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diff --git a/tools/crashreporter/minidump_stackwalk/http_symbol_supplier.h b/tools/crashreporter/minidump_stackwalk/http_symbol_supplier.h
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+// Copyright (c) 2011 The Mozilla Foundation
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of The Mozilla Foundation nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// A SymbolSupplier that can fetch symbols via HTTP from a symbol server
+// serving them at Microsoft symbol server-compatible paths.
+
+#include <map>
+#include <set>
+#include <string>
+
+#include "processor/simple_symbol_supplier.h"
+
+#ifdef _WIN32
+#  include <windows.h>
+#  include <wininet.h>
+#else
+typedef void CURL;
+#endif
+
+namespace google_breakpad {
+class CodeModule;
+struct SystemInfo;
+}  // namespace google_breakpad
+
+namespace breakpad_extra {
+
+using google_breakpad::CodeModule;
+using google_breakpad::SimpleSymbolSupplier;
+using google_breakpad::SymbolSupplier;
+using google_breakpad::SystemInfo;
+using std::string;
+using std::vector;
+
+class HTTPSymbolSupplier : public SimpleSymbolSupplier {
+ public:
+  // Construct an HTTPSymbolSupplier.
+  // |server_urls| contains URLs to query for symbols.
+  // |cache_path| is a directory in which to store downloaded symbols.
+  // |local_paths| are directories to query for symbols before checking URLs.
+  HTTPSymbolSupplier(const vector<string>& server_urls,
+                     const string& cache_path,
+                     const vector<string>& local_paths, const string& tmp_path);
+  virtual ~HTTPSymbolSupplier();
+
+  // Returns the path to the symbol file for the given module.  See the
+  // description above.
+  virtual SymbolSupplier::SymbolResult GetSymbolFile(
+      const CodeModule* module, const SystemInfo* system_info,
+      string* symbol_file);
+
+  virtual SymbolSupplier::SymbolResult GetSymbolFile(
+      const CodeModule* module, const SystemInfo* system_info,
+      string* symbol_file, string* symbol_data);
+
+  // Allocates data buffer on heap and writes symbol data into buffer.
+  // Symbol supplier ALWAYS takes ownership of the data buffer.
+  virtual SymbolSupplier::SymbolResult GetCStringSymbolData(
+      const CodeModule* module, const SystemInfo* system_info,
+      string* symbol_file, char** symbol_data, size_t* size);
+
+  struct SymbolStats {
+    // true if the symbol file was already cached on disk,
+    // false if a HTTP request was made to fetch it.
+    bool was_cached_on_disk;
+    // If was_cached_on_disk is false, the time in milliseconds
+    // that the full HTTP request to fetch the symbol file took.
+    float fetch_time_ms;
+  };
+
+  // Get stats on symbols for a module.
+  // Returns true if stats were found, false if not.
+  bool GetStats(const CodeModule* module, SymbolStats* stats) const;
+
+ private:
+  bool FetchSymbolFile(const CodeModule* module, const SystemInfo* system_info);
+
+  bool SymbolWasError(const CodeModule* module, const SystemInfo* system_info);
+  void StoreCacheHit(const CodeModule* Module);
+  void StoreCacheMiss(const CodeModule* module, float fetch_time);
+  void StoreSymbolStats(const CodeModule* module, const SymbolStats& stats);
+
+  vector<string> server_urls_;
+  string cache_path_;
+  string tmp_path_;
+  std::set<std::pair<string, string>> error_symbols_;
+  std::map<std::pair<string, string>, SymbolStats> symbol_stats_;
+#ifdef _WIN32
+  HINTERNET session_;
+#else
+  CURL* session_;
+#endif
+};
+
+}  // namespace breakpad_extra