Move EnableSpdy from HttpNetworkLayer to IOThread.

chrome/browser/io_thread.h

 // Copyright (c) 2012 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 <string>
 
 #include "base/basictypes.h"
@@ skipping 152 matching lines @@
   friend class SystemURLRequestContextGetter;
 
   // BrowserThreadDelegate implementation, runs on the IO thread.
   // This handles initialization and destruction of state that must
   // live on the IO thread.
   virtual void Init() OVERRIDE;
   virtual void CleanUp() OVERRIDE;
 
   void InitializeNetworkOptions(const CommandLine& parsed_command_line);
 
+  // Enable the spdy protocol.
+  // Without calling this function, SPDY is disabled.  The mode can be:

[Ryan Sleevi, 2012/11/27 20:06:38]

This is... an odd default.

Why is SPDY disabled by default?

[Ryan Hamilton, 2012/11/27 20:52:53]

That comment appears to be incorrect.  I've revamped it.

+  //   ""            : (default) SSL and compression are enabled, flow
+  //                   control disabled.
+  //   "no-ssl"      : disables SSL.
+  //   "no-compress" : disables compression.
+  //   "flow-control": enables flow control.
+  //   "none"        : disables both SSL and compression.
+  void EnableSpdy(const std::string& mode);
+
   // Global state must be initialized on the IO thread, then this
   // method must be invoked on the UI thread.
   void InitSystemRequestContext();
 
   // Lazy initialization of system request context for
   // SystemURLRequestContextGetter. To be called on IO thread only
   // after global state has been initialized on the IO thread, and
   // SystemRequestContext state has been initialized on the UI thread.
   void InitSystemRequestContextOnIOThread();
 
@@ skipping 57 matching lines @@
 
   // True if SPDY is disabled by policy.
   bool is_spdy_disabled_by_policy_;
 
   base::WeakPtrFactory<IOThread> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(IOThread);
 };
 
 #endif  // CHROME_BROWSER_IO_THREAD_H_