Pull IOThread out of BrowserProcessImpl. Move the dns prefetching initialization into IOThread.

The global host resolver and dns master have changed to be member variables of IOThread.
BUG=26156,26159

Review URL: http://codereview.chromium.org/553026

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@36866 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 70 insertions, 0 deletions

diff --git a/chrome/browser/io_thread.h b/chrome/browser/io_thread.h
new file mode 100644
index 0000000..f93f748
--- /dev/null
+++ b/chrome/browser/io_thread.h
@@ -0,0 +1,70 @@
+// 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_IO_THREAD_H_
+#define CHROME_BROWSER_IO_THREAD_H_
+
+#include "base/basictypes.h"
+#include "base/task.h"
+#include "chrome/browser/browser_process_sub_thread.h"
+#include "chrome/common/net/dns.h"
+#include "net/base/host_resolver.h"
+
+class ListValue;
+
+namespace chrome_browser_net {
+class DnsMaster;
+}  // namespace chrome_browser_net
+
+class IOThread : public BrowserProcessSubThread {
+ public:
+  IOThread();
+
+  virtual ~IOThread();
+
+  net::HostResolver* host_resolver();
+
+  // Initializes the DnsMaster.  |prefetching_enabled| indicates whether or
+  // not dns prefetching should be enabled.  This should be called by the UI
+  // thread.  It will post a task to the IO thread to perform the actual
+  // initialization.
+  void InitDnsMaster(bool prefetching_enabled,
+                     base::TimeDelta max_queue_delay,
+                     size_t max_concurrent,
+                     const chrome_common_net::NameList& hostnames_to_prefetch,
+                     ListValue* referral_list);
+
+  // Handles changing to On The Record mode.  Posts a task for this onto the
+  // IOThread's message loop.
+  void ChangedToOnTheRecord();
+
+ protected:
+  virtual void Init();
+  virtual void CleanUp();
+
+ private:
+  void InitDnsMasterOnIOThread(
+      bool prefetching_enabled,
+      base::TimeDelta max_queue_delay,
+      size_t max_concurrent,
+      chrome_common_net::NameList hostnames_to_prefetch,
+      ListValue* referral_list);
+
+  void ChangedToOnTheRecordOnIOThread();
+
+  // These member variables are basically global, but their lifetimes are tied
+  // to the IOThread.  IOThread owns them all, despite not using scoped_ptr.
+  // This is because the destructor of IOThread runs on the wrong thread.  All
+  // member variables should be deleted in CleanUp().  Most of these will be
+  // initialized in Init().
+
+  net::HostResolver* host_resolver_;
+
+  net::HostResolver::Observer* prefetch_observer_;
+  chrome_browser_net::DnsMaster* dns_master_;
+
+  DISALLOW_COPY_AND_ASSIGN(IOThread);
+};
+
+#endif // CHROME_BROWSER_IO_THREAD_H_