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diff --git a/src/processor/stackwalker_address_list.cc b/src/processor/stackwalker_address_list.cc
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+// Copyright (c) 2013 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.
+
+// stackwalker_address_list.cc: a pseudo stack walker.
+//
+// See stackwalker_address_list.h for documentation.
+//
+// Author: Chris Hamilton <chrisha@chromium.org>
+
+#include <assert.h>
+
+#include <vector>
+
+#include "google_breakpad/processor/call_stack.h"
+#include "google_breakpad/processor/memory_region.h"
+#include "google_breakpad/processor/source_line_resolver_interface.h"
+#include "google_breakpad/processor/stack_frame.h"
+#include "processor/logging.h"
+#include "processor/stackwalker_address_list.h"
+
+namespace google_breakpad {
+
+StackwalkerAddressList::StackwalkerAddressList(
+    const uint64_t* frames,
+    size_t frame_count,
+    const CodeModules* modules,
+    StackFrameSymbolizer* frame_symbolizer)
+    : Stackwalker(NULL, NULL, modules, frame_symbolizer),
+      frames_(frames),
+      frame_count_(frame_count) {
+  assert(frames);
+  assert(frame_symbolizer);
+}
+
+StackFrame* StackwalkerAddressList::GetContextFrame() {
+  if (frame_count_ == 0)
+    return NULL;
+
+  StackFrame* frame = new StackFrame();
+  frame->instruction = frames_[0];
+  frame->trust = StackFrame::FRAME_TRUST_CONTEXT;
+  return frame;
+}
+
+StackFrame* StackwalkerAddressList::GetCallerFrame(const CallStack* stack,
+                                                   bool stack_scan_allowed) {
+  if (!stack) {
+    BPLOG(ERROR) << "Can't get caller frame without stack";
+    return NULL;
+  }
+
+  size_t frame_index = stack->frames()->size();
+
+  // There are no more frames to fetch.
+  if (frame_index >= frame_count_)
+    return NULL;
+
+  // All frames have the highest level of trust because they were
+  // explicitly provided.
+  StackFrame* frame = new StackFrame();
+  frame->instruction = frames_[frame_index];
+  frame->trust = StackFrame::FRAME_TRUST_CONTEXT;
+  return frame;
+}
+
+}  // namespace google_breakpad