Instant: Use only one hidden WebContents per profile.

chrome/browser/ui/views/frame/instant_overlay_controller_views.h

Index: chrome/browser/ui/views/frame/instant_overlay_controller_views.h
diff --git a/chrome/browser/ui/views/frame/instant_overlay_controller_views.h b/chrome/browser/ui/views/frame/instant_overlay_controller_views.h
new file mode 100644
index 0000000000000000000000000000000000000000..47272ff91043cb4b5821ddb6cd8540c1bfd29bb6
--- /dev/null
+++ b/chrome/browser/ui/views/frame/instant_overlay_controller_views.h
@@ -0,0 +1,46 @@
+// Copyright 2012 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_VIEWS_FRAME_INSTANT_OVERLAY_CONTROLLER_VIEWS_H_
+#define CHROME_BROWSER_UI_VIEWS_FRAME_INSTANT_OVERLAY_CONTROLLER_VIEWS_H_
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "base/memory/scoped_ptr.h"
+#include "chrome/browser/instant/instant_overlay_controller.h"
+
+class Browser;
+class ContentsContainer;
+
+namespace views {
+class WebView;
+}
+
+// A controller that manages the Views-specific Instant overlay. Its primary
+// role is to respond to display-state changes from the Instant model and
+// reflect this in the visibility and layout of the overlay.
+class InstantOverlayControllerViews : public InstantOverlayController {
+ public:
+  InstantOverlayControllerViews(Browser* browser, ContentsContainer* contents);
+  virtual ~InstantOverlayControllerViews();
+
+  views::WebView* overlay() { return overlay_.get(); }
+
+  views::WebView* release_overlay() WARN_UNUSED_RESULT {
+    return overlay_.release();
+  }
+
+ private:
+  // Overridden from InstantOverlayController:
+  virtual void OverlayStateChanged(const InstantModel& model) OVERRIDE;
+
+  ContentsContainer* const contents_;
+
+  // The view that contains the Instant overlay web contents.
+  scoped_ptr<views::WebView> overlay_;
+
+  DISALLOW_COPY_AND_ASSIGN(InstantOverlayControllerViews);
+};
+
+#endif  // CHROME_BROWSER_UI_VIEWS_FRAME_INSTANT_OVERLAY_CONTROLLER_VIEWS_H_