Instant: Use only one hidden WebContents per profile.

chrome/browser/instant/instant_web_contents_container.h

Index: chrome/browser/instant/instant_web_contents_container.h
diff --git a/chrome/browser/instant/instant_web_contents_container.h b/chrome/browser/instant/instant_web_contents_container.h
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+++ b/chrome/browser/instant/instant_web_contents_container.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_INSTANT_INSTANT_WEB_CONTENTS_CONTAINER_H_
+#define CHROME_BROWSER_INSTANT_INSTANT_WEB_CONTENTS_CONTAINER_H_
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "base/memory/scoped_ptr.h"
+#include "chrome/browser/instant/instant_page.h"
+#include "chrome/browser/ui/tab_contents/core_tab_helper_delegate.h"
+#include "content/public/browser/web_contents_delegate.h"
+
+class InstantService;
+
+namespace content {
+class WebContents;
+}
+
+// InstantWebContentsContainer owns a WebContents that can be shown as an
+// overlay or merged into a tab. It can't be instantiated per se, but exists by
+// way of its derived classes (InstantPreloader and InstantOverlay). It
+// implements WebContentsDelegate methods that are common to the derived
+// classes. It also owns an InstantPage object that it uses to talk the
+// SearchBox API with its contents.
+class InstantWebContentsContainer : public CoreTabHelperDelegate,
+                                    public content::WebContentsDelegate {
+ public:
+  content::WebContents* contents() const { return contents_.get(); }
+
+ protected:
+  InstantWebContentsContainer(InstantPage::Delegate* delegate,
+                              InstantService* service);
+  virtual ~InstantWebContentsContainer();
+
+  // Overridden from CoreTabHelperDelegate:
+  virtual void SwapTabContents(content::WebContents* old_contents,
+                               content::WebContents* new_contents) OVERRIDE;
+
+  // Overriden from content::WebContentsDelegate:
+  virtual content::WebContents* OpenURLFromTab(
+      content::WebContents* source,
+      const content::OpenURLParams& params) OVERRIDE;
+  virtual bool ShouldFocusPageAfterCrash() OVERRIDE;
+  virtual bool CanDownload(content::RenderViewHost* render_view_host,
+                           int request_id,
+                           const std::string& request_method) OVERRIDE;
+  virtual bool OnGoToEntryOffset(int offset) OVERRIDE;
+
+  virtual void SetUpContents();
+  virtual void TearDownContents();
+
+  scoped_ptr<content::WebContents> contents_;
+  InstantPage page_;
+
+  DISALLOW_COPY_AND_ASSIGN(InstantWebContentsContainer);
+};
+
+#endif  // CHROME_BROWSER_INSTANT_INSTANT_WEB_CONTENTS_CONTAINER_H_