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diff --git a/chrome/browser/ui/search/instant_overlay.h b/chrome/browser/ui/search/instant_overlay.h
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+++ b/chrome/browser/ui/search/instant_overlay.h
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+// Copyright 2013 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_BROWSER_UI_SEARCH_INSTANT_OVERLAY_H_
+#define CHROME_BROWSER_UI_SEARCH_INSTANT_OVERLAY_H_
+
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "base/gtest_prod_util.h"
+#include "base/memory/scoped_ptr.h"
+#include "chrome/browser/history/history_types.h"
+#include "chrome/browser/ui/search/instant_controller.h"
+#include "chrome/browser/ui/search/instant_loader.h"
+#include "chrome/browser/ui/search/instant_page.h"
+
+class Profile;
+
+namespace content {
+class WebContents;
+}
+
+// InstantOverlay is used to communicate with an overlay WebContents that it
+// owns and loads the "Instant URL" into. This overlay can appear and disappear
+// at will as the user types in the omnibox.
+class InstantOverlay : public InstantPage,
+                       public InstantLoader::Delegate {
+ public:
+  // Returns the InstantOverlay for |contents| if it's used for Instant.
+  static InstantOverlay* FromWebContents(const content::WebContents* contents);
+
+  InstantOverlay(InstantController* controller,
+                 const std::string& instant_url);
+  virtual ~InstantOverlay();
+
+  // Creates a new WebContents and loads |instant_url_| into it. Uses
+  // |active_tab|, if non-NULL, to initialize the size of the WebContents.
+  void InitContents(Profile* profile,
+                    const content::WebContents* active_tab);
+
+  // Releases the overlay WebContents. This should be called when the overlay
+  // is committed.
+  scoped_ptr<content::WebContents> ReleaseContents() WARN_UNUSED_RESULT;
+
+  // Returns the URL that we're loading.
+  const std::string& instant_url() const { return instant_url_; }
+
+  // Returns whether the underlying contents is stale (i.e. was loaded too long
+  // ago).
+  bool is_stale() const { return is_stale_; }
+
+  // Returns true if the mouse or a touch pointer is down due to activating the
+  // overlay contents.
+  bool is_pointer_down_from_activate() const {
+    return is_pointer_down_from_activate_;
+  }
+
+  // Returns info about the last navigation by the Instant page. If the page
+  // hasn't navigated since the last Update(), the URL is empty.
+  const history::HistoryAddPageArgs& last_navigation() const {
+    return last_navigation_;
+  }
+
+  // Called by the history tab helper with information that it would have added
+  // to the history service had this WebContents not been used for Instant.
+  void DidNavigate(const history::HistoryAddPageArgs& add_page_args);
+
+  // Returns true if the overlay is using
+  // InstantController::kLocalOmniboxPopupURL as the |instant_url_|.
+  bool IsUsingLocalOverlay() const;
+
+  // Overridden from InstantPage:
+  virtual void Update(const string16& text,
+                      size_t selection_start,
+                      size_t selection_end,
+                      bool verbatim) OVERRIDE;
+
+ private:
+  FRIEND_TEST_ALL_PREFIXES(InstantTest, InstantOverlayRefresh);
+
+  // Helper to access delegate() as an InstantController object.
+  InstantController* instant_controller() const {
+    return static_cast<InstantController*>(delegate());
+  }
+
+  // Overridden from InstantPage:
+  virtual bool ShouldProcessRenderViewCreated() OVERRIDE;
+  virtual bool ShouldProcessRenderViewGone() OVERRIDE;
+  virtual bool ShouldProcessAboutToNavigateMainFrame() OVERRIDE;
+  virtual bool ShouldProcessSetSuggestions() OVERRIDE;
+  virtual bool ShouldProcessShowInstantOverlay() OVERRIDE;
+  virtual bool ShouldProcessNavigateToURL() OVERRIDE;
+
+  // Overriden from InstantLoader::Delegate:
+  virtual void OnSwappedContents() OVERRIDE;
+  virtual void OnFocus() OVERRIDE;
+  virtual void OnMouseDown() OVERRIDE;
+  virtual void OnMouseUp() OVERRIDE;
+  virtual content::WebContents* OpenURLFromTab(
+      content::WebContents* source,
+      const content::OpenURLParams& params) OVERRIDE;
+  virtual void LoadCompletedMainFrame() OVERRIDE;
+
+  // Called when the underlying page becomes stale.
+  void HandleStalePage();
+
+  InstantLoader loader_;
+  const std::string instant_url_;
+  bool is_stale_;
+  bool is_pointer_down_from_activate_;
+  history::HistoryAddPageArgs last_navigation_;
+
+  DISALLOW_COPY_AND_ASSIGN(InstantOverlay);
+};
+
+#endif  // CHROME_BROWSER_UI_SEARCH_INSTANT_OVERLAY_H_