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diff --git a/toolkit/crashreporter/google-breakpad/src/google_breakpad/processor/stack_frame_symbolizer.h b/toolkit/crashreporter/google-breakpad/src/google_breakpad/processor/stack_frame_symbolizer.h
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+// -*- mode: C++ -*-
+
+// Copyright (c) 2012 Google Inc.
+// 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 Google Inc. 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.
+
+// Helper class that encapsulates the logic of how symbol supplier interacts
+// with source line resolver to fill stack frame information.
+
+#ifndef GOOGLE_BREAKPAD_PROCESSOR_STACK_FRAME_SYMBOLIZER_H__
+#define GOOGLE_BREAKPAD_PROCESSOR_STACK_FRAME_SYMBOLIZER_H__
+
+#include <set>
+#include <string>
+
+#include "common/using_std_string.h"
+#include "google_breakpad/common/breakpad_types.h"
+#include "google_breakpad/processor/code_module.h"
+
+namespace google_breakpad {
+class CFIFrameInfo;
+class CodeModules;
+class SymbolSupplier;
+class SourceLineResolverInterface;
+struct StackFrame;
+struct SystemInfo;
+struct WindowsFrameInfo;
+
+class StackFrameSymbolizer {
+ public:
+  enum SymbolizerResult {
+    // Symbol data was found and successfully loaded in resolver.
+    // This does NOT guarantee source line info is found within symbol file.
+    kNoError,
+    // This indicates non-critical error, such as, no code module found for
+    // frame's instruction, no symbol file, or resolver failed to load symbol.
+    kError,
+    // This indicates error for which stack walk should be interrupted
+    // and retried in future.
+    kInterrupt,
+    // Symbol data was found and loaded in resolver however some corruptions
+    // were detected.
+    kWarningCorruptSymbols,
+  };
+
+  StackFrameSymbolizer(SymbolSupplier* supplier,
+                       SourceLineResolverInterface* resolver);
+
+  virtual ~StackFrameSymbolizer() { }
+
+  // Encapsulate the step of resolving source line info for a stack frame.
+  // "frame" must not be NULL.
+  virtual SymbolizerResult FillSourceLineInfo(
+      const CodeModules* modules,
+      const CodeModules* unloaded_modules,
+      const SystemInfo* system_info,
+      StackFrame* stack_frame);
+
+  virtual WindowsFrameInfo* FindWindowsFrameInfo(const StackFrame* frame);
+
+  virtual CFIFrameInfo* FindCFIFrameInfo(const StackFrame* frame);
+
+  // Reset internal (locally owned) data as if the helper is re-instantiated.
+  // A typical case is to call Reset() after processing an individual report
+  // before start to process next one, in order to reset internal information
+  // about missing symbols found so far.
+  virtual void Reset() { no_symbol_modules_.clear(); }
+
+  // Returns true if there is valid implementation for stack symbolization.
+  virtual bool HasImplementation() { return resolver_ && supplier_; }
+
+  SourceLineResolverInterface* resolver() { return resolver_; }
+  SymbolSupplier* supplier() { return supplier_; }
+
+ protected:
+  SymbolSupplier* supplier_;
+  SourceLineResolverInterface* resolver_;
+  // A list of modules known to have symbols missing. This helps avoid
+  // repeated lookups for the missing symbols within one minidump.
+  std::set<string> no_symbol_modules_;
+};
+
+}  // namespace google_breakpad
+
+#endif  // GOOGLE_BREAKPAD_PROCESSOR_STACK_FRAME_SYMBOLIZER_H__