Instant: Use only one hidden WebContents per profile.

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/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.
+// IO thread data held for Instant. This mirrors 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);
+  // Installs the |io_context| into the UserData of the |resource_context|.
+  static void SetUserDataOnIO(content::ResourceContext* resource_context,
+                              scoped_refptr<InstantIOContext> 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,
+  // processes. Used to keep process IDs in sync with InstantService.
+  static void AddInstantProcessOnIO(scoped_refptr<InstantIOContext> io_context,
+                                    int process_id);
+  static void RemoveInstantProcessOnIO(
+      scoped_refptr<InstantIOContext> 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.
+  // Determine if this chrome-search: request is 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_|.
+  virtual ~InstantIOContext();
+
+  // Check that |process_id| is in the set of known Instant processes.
   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.
+  // 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_