Use a valid /prefetch argument when launching a process.

content/public/browser/content_browser_client.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 CONTENT_PUBLIC_BROWSER_CONTENT_BROWSER_CLIENT_H_
 #define CONTENT_PUBLIC_BROWSER_CONTENT_BROWSER_CLIENT_H_
 
 #include <stddef.h>
 
 #include <map>
@@ skipping 733 matching lines @@
   // This is called on the PROCESS_LAUNCHER thread before the renderer process
   // is launched. It gives the embedder a chance to add loosen the sandbox
   // policy.
   virtual bool PreSpawnRenderer(sandbox::TargetPolicy* policy);
 
   // Returns the AppContainer SID for the specified sandboxed process type, or
   // empty string if this sandboxed process type does not support living inside
   // an AppContainer.
   virtual base::string16 GetAppContainerSidForSandboxType(
       int sandbox_type) const;
+
+  // Returns true if processes should be launched with a /prefetch:# argument.

[gab, 2016/01/26 21:40:26]

Also refer to a place where you explain the details of /prefetch (e.g.
kPrefetchArgument* section of the switches.cc file?) -- i.e. think of any
content embedder seeing this new API and wondering what to do with it.

[fdoray, 2016/01/27 20:12:19]

Done.

+  virtual bool ShouldUseWindowsPrefetchArgument() const;
 #endif
 
 #if defined(VIDEO_HOLE)
   // Allows an embedder to provide its own ExternalVideoSurfaceContainer
   // implementation.  Return nullptr to disable external surface video.
   virtual ExternalVideoSurfaceContainer*
   OverrideCreateExternalVideoSurfaceContainer(WebContents* web_contents);
 #endif
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_CONTENT_BROWSER_CLIENT_H_