Revert CL 117933003. Re-add resource speculative prefetching code.

chrome/common/chrome_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 "chrome/common/chrome_switches.h"
 
 #include "base/base_switches.h"
 #include "base/command_line.h"
 
 namespace switches {
@@ skipping 1070 matching lines @@
 
 // Simulates a critical update being available.
 const char kSimulateCriticalUpdate[]        = "simulate-critical-update";
 
 // Simulates that current version is outdated.
 const char kSimulateOutdated[]               = "simulate-outdated";
 
 // Simulates that current version is outdated and auto-update is off.
 const char kSimulateOutdatedNoAU[]           = "simulate-outdated-no-au";
 
+// Speculative resource prefetching.
+const char kSpeculativeResourcePrefetching[] =
+    "speculative-resource-prefetching";
+
+// Speculative resource prefetching is disabled.
+const char kSpeculativeResourcePrefetchingDisabled[] = "disabled";
+
+// Speculative resource prefetching will only learn about resources that need to
+// be prefetched but will not prefetch them.
+const char kSpeculativeResourcePrefetchingLearning[] = "learning";
+
+// Speculative resource prefetching is enabled.
+const char kSpeculativeResourcePrefetchingEnabled[] = "enabled";
+
 // Specifies the URL where spelling service feedback data will be sent instead
 // of the default URL. This switch is for temporary testing only.
 // TODO(rouslan): Remove this flag when feedback testing is complete. Revisit by
 // August 2013.
 const char kSpellingServiceFeedbackUrl[] = "spelling-service-feedback-url";
 
 // Specifies the number of seconds between sending batches of feedback to
 // spelling service. The default is 30 minutes. The minimum is 5 seconds. This
 // switch is for temporary testing only.
 // TODO(rouslan): Remove this flag when feedback testing is complete. Revisit by
@@ skipping 255 matching lines @@
 
 // -----------------------------------------------------------------------------
 // DO NOT ADD YOUR CRAP TO THE BOTTOM OF THIS FILE.
 //
 // You were going to just dump your switches here, weren't you? Instead, please
 // put them in alphabetical order above, or in order inside the appropriate
 // ifdef at the bottom. The order should match the header.
 // -----------------------------------------------------------------------------
 
 }  // namespace switches