Add chrome-search: access from Instant overlay

chrome/browser/instant/instant_io_context.h

Index: chrome/browser/instant/instant_io_context.h
diff --git a/chrome/browser/instant/instant_io_context.h b/chrome/browser/instant/instant_io_context.h
new file mode 100644
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+++ b/chrome/browser/instant/instant_io_context.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_IO_CONTEXT_
+#define CHROME_BROWSER_INSTANT_INSTANT_IO_CONTEXT_
+
+#include <set>
+
+#include "base/basictypes.h"
+#include "base/memory/ref_counted.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::RefCountedThreadSafe<InstantIOContext> {
+ public:
+  InstantIOContext();
+
+  // Key name for context UserData.  UserData is created by InstantService
+  // but accessed by InstantIOContext.
+  static const char kInstantIOContextKeyName[];
+
+  // Installs the |instant_io_context| into the UserData of the
+  // |resource_context|.
+  static void SetUserDataOnIO(
+      content::ResourceContext* resource_context,
+      scoped_refptr<InstantIOContext> instant_io_context);
+
+  // Add and remove RenderProcessHost IDs that are associated with Instant
+  // processes.  Used to keep process IDs in sync with InstantService.
+  static void AddInstantProcessOnIO(
+      scoped_refptr<InstantIOContext> instant_io_context,
+      int process_id);
+  static void RemoveInstantProcessOnIO(
+      scoped_refptr<InstantIOContext> instant_io_context,
+      int process_id);
+  static void ClearInstantProcessesOnIO(
+      scoped_refptr<InstantIOContext> instant_io_context);
+
+  // Determine if this chrome-search: request is coming from an Instant render
+  // process.
+  static bool ShouldServiceRequest(const net::URLRequest* request);
+
+ protected:
+   virtual ~InstantIOContext();
+
+ private:
+  friend class base::RefCountedThreadSafe<InstantIOContext>;
+
+  // Check that |process_id| is in the known set of Instant processes, ie.
+  // |process_ids_|.
+  bool IsInstantProcess(int process_id) const;
+
+  // 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_