Add chrome-search: access from Instant overlay

chrome/browser/instant/instant_io_context.h

+// 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_IO_CONTEXT_
+#define CHROME_BROWSER_INSTANT_INSTANT_IO_CONTEXT_
+
+#include <set>
+
+#include "base/basictypes.h"
+#include "base/supports_user_data.h"
+
+namespace content {
+class ResourceContext;
+}
+
+namespace net {
+class URLRequest;
+}
+
+// IO thread data held for Instant.  This reflects the data held in
+// InstantService for use on the IO thread.  Owned by ResourceContext
+// as user data.
+class InstantIOContext : public base::SupportsUserData::Data {
+ public:
+  InstantIOContext();
+  virtual ~InstantIOContext();
+
+  // Add and remove RenderProcessHost IDs that are associated with Instant
+  // processes.  Used to keep process ids in sync with InstantService.
+  static void AddInstantProcessOnIO(content::ResourceContext* context,
+                                    int process_id);
+  static void RemoveInstantProcessOnIO(content::ResourceContext* context,
+                                       int process_id);
+  static void ClearInstantProcessesOnIO(content::ResourceContext* context);
+
+  // Determine if this chrome-search: request is coming from an Instant render
+  // process.
+  static bool ShouldServiceRequest(const net::URLRequest* request);
+
+ private:
+  // Check that |process_id| is in the known set of Instant processes, ie.
+  // |process_ids_|.
+  void AddInstantProcess(int process_id);
+  void RemoveInstantProcess(int process_id);
+  bool IsInstantProcess(int process_id) const;
+  void ClearInstantProcesses();
+
+  // The process ids associated with Instant processes.  Mirror of the process
+  // ids in InstantService.  Duplicated here for synchronous access on the IO
+  // thread.
+  std::set<int> process_ids_;
+
+  DISALLOW_COPY_AND_ASSIGN(InstantIOContext);
+};
+
+#endif  // CHROME_BROWSER_INSTANT_INSTANT_IO_CONTEXT_