predictors: Add a origin for prefetch requests, remove the URL/host settings.

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"
 #include "build/build_config.h"
 #include "ppapi/features/features.h"
@@ skipping 875 matching lines @@
 // Speculative resource prefetching.
 const char kSpeculativeResourcePrefetching[] =
     "speculative-resource-prefetching";
 
 // Speculative resource prefetching is disabled.
 const char kSpeculativeResourcePrefetchingDisabled[] = "disabled";
 
 // Speculative resource prefetching is enabled.
 const char kSpeculativeResourcePrefetchingEnabled[] = "enabled";
 
+// Speculative resource prefetching is enabled for external requests.
+const char kSpeculativeResourcePrefetchingEnabledExternal[] =
+    "enabled-external-only";
+
 // Speculative resource prefetching will only learn about resources that need to
 // be prefetched but will not prefetch them.
 const char kSpeculativeResourcePrefetchingLearning[] = "learning";
 
 // Causes SSL key material to be logged to the specified file for debugging
 // purposes. See
 // https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/Key_Log_Format
 // for the format.
 const char kSSLKeyLogFile[]               = "ssl-key-log-file";
 
@@ skipping 410 matching lines @@
 
 // -----------------------------------------------------------------------------
 // DO NOT ADD YOUR VERY NICE FLAGS 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