Allows prefetch requests to live beyond the renderer by delaying

content/public/common/content_switches.cc

 // 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.
 
 #include "content/public/common/content_switches.h"
 
 namespace switches {
 
 // By default, file:// URIs cannot read other file:// URIs. This is an
 // override for developers who need the old behavior for testing.
@@ skipping 45 matching lines @@
 // Path to the exe to run for the renderer and plugin subprocesses.
 const char kBrowserSubprocessPath[]         = "browser-subprocess-path";
 
 // Dumps extra logging about plugin loading to the log file.
 const char kDebugPluginLoading[] = "debug-plugin-loading";
 
 // Sets the tile size used by composited layers.
 const char kDefaultTileWidth[]              = "default-tile-width";
 const char kDefaultTileHeight[]             = "default-tile-height";
 
+// Delay canceling prefetches for a few seconds so that navigation events
+// don't immediately drop an in-flight prefetch.

[asanka, 2013/10/14 21:06:49]

Nit: Update comment. Probably want to explicitly mention the <a ping> case.

+const char kDelayDetachableCancellation[] = "delay-detachable-cancellation";
+
 // Disable antialiasing on 2d canvas.
 const char kDisable2dCanvasAntialiasing[]   = "disable-canvas-aa";
 
 // Disables client-visible 3D APIs, in particular WebGL and Pepper 3D.
 // This is controlled by policy and is kept separate from the other
 // enable/disable switches to avoid accidentally regressing the policy
 // support for controlling access to these APIs.
 const char kDisable3DAPIs[]                 = "disable-3d-apis";
 
 // Disable gpu-accelerated 2d canvas.
@@ skipping 906 matching lines @@
 #endif
 
 #if defined(USE_AURA)
 // Forces usage of the test compositor. Needed to run ui tests on bots.
 extern const char kTestCompositor[]         = "test-compositor";
 #endif
 
 // Don't dump stuff here, follow the same order as the header.
 
 }  // namespace switches