Merge Chromium src@r53293

Change-Id: Ia79acf8670f385cee48c45b0a75371d8e950af34

1 files changed, 56 insertions, 0 deletions

diff --git a/chrome/browser/cross_site_request_manager.h b/chrome/browser/cross_site_request_manager.h
new file mode 100644
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--- /dev/null
+++ b/chrome/browser/cross_site_request_manager.h
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+// Copyright (c) 2010 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_CROSS_SITE_REQUEST_MANAGER_H__
+#define CHROME_BROWSER_CROSS_SITE_REQUEST_MANAGER_H__
+
+#include <set>
+#include <utility>
+
+#include "base/basictypes.h"
+#include "base/lock.h"
+#include "base/singleton.h"
+
+// CrossSiteRequestManager is used to handle bookkeeping for cross-site
+// requests and responses between the UI and IO threads.  Such requests involve
+// a transition from one RenderViewHost to another within TabContents, and
+// involve coordination with ResourceDispatcherHost.
+//
+// CrossSiteRequestManager is a singleton that may be used on any thread.
+//
+class CrossSiteRequestManager {
+ public:
+  // Returns whether the RenderViewHost specified by the given IDs currently
+  // has a pending cross-site request.  If so, we will have to delay the
+  // response until the previous RenderViewHost runs its onunload handler.
+  // Called by ResourceDispatcherHost on the IO thread.
+  bool HasPendingCrossSiteRequest(int renderer_id, int render_view_id);
+
+  // Sets whether the RenderViewHost specified by the given IDs currently has a
+  // pending cross-site request.  Called by RenderViewHost on the UI thread.
+  void SetHasPendingCrossSiteRequest(int renderer_id,
+                                     int render_view_id,
+                                     bool has_pending);
+
+ private:
+  friend struct DefaultSingletonTraits<CrossSiteRequestManager>;
+  typedef std::set<std::pair<int, int> > RenderViewSet;
+
+  // Obtain an instance of CrossSiteRequestManager via
+  // Singleton<CrossSiteRequestManager>().
+  CrossSiteRequestManager() {}
+
+  // You must acquire this lock before reading or writing any members of this
+  // class.  You must not block while holding this lock.
+  Lock lock_;
+
+  // Set of (render_process_host_id, render_view_id) pairs of all
+  // RenderViewHosts that have pending cross-site requests.  Used to pass
+  // information about the RenderViewHosts between the UI and IO threads.
+  RenderViewSet pending_cross_site_views_;
+
+  DISALLOW_COPY_AND_ASSIGN(CrossSiteRequestManager);
+};
+
+#endif  // CHROME_BROWSER_CROSS_SITE_REQUEST_MANAGER_H__