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diff --git a/chrome/renderer/greasemonkey_slave.h b/chrome/renderer/greasemonkey_slave.h
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+++ b/chrome/renderer/greasemonkey_slave.h
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+// Copyright (c) 2008 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.
+
+#ifndef CHROME_RENDERER_GREASEMONKEY_SLAVE_H__
+#define CHROME_RENDERER_GREASEMONKEY_SLAVE_H__
+
+#include <vector>
+
+#include "base/scoped_ptr.h"
+#include "base/shared_memory.h"
+#include "base/string_piece.h"
+#include "webkit/glue/webframe.h"
+
+// Parsed representation of a Greasemonkey script.
+class GreasemonkeyScript {
+ public:
+  // TODO(aa): Pass in filename script came from, for errors. Needs to be in
+  // shared memory.
+  GreasemonkeyScript() {}
+
+  const StringPiece& GetBody() const {
+    return body_;
+  }
+
+  bool Parse(const StringPiece& script_text) {
+    // TODO(aa): Parse out includes, convert to regexes.
+    body_ = script_text;
+    return true;
+  }
+
+ private:
+  // References the body of the script in shared memory. The underlying memory
+  // is valid until shared_memory_ is either deleted or Unmap()'d.
+  StringPiece body_;
+};
+
+
+// Manages installed GreasemonkeyScripts for a render process.
+class GreasemonkeySlave {
+ public:
+  GreasemonkeySlave();
+
+  // Update the parsed scripts from shared memory.
+  bool UpdateScripts(SharedMemoryHandle shared_memory);
+
+  // Inject the appropriate scripts into a frame based on its URL.
+  // TODO(aa): Extract a GreasemonkeyFrame interface out of this to improve
+  // testability.
+  bool InjectScripts(WebFrame* frame);
+
+ private:
+  // Shared memory containing raw script data.
+  scoped_ptr<SharedMemory> shared_memory_;
+
+  // Parsed script data.
+  std::vector<GreasemonkeyScript> scripts_;
+
+  DISALLOW_COPY_AND_ASSIGN(GreasemonkeySlave);
+};
+
+#endif // CHROME_RENDERER_GREASEMONKEY_SLAVE_H__