Adds speculative prefetching of resources.

chrome/browser/prerender/prerender_field_trial.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/browser/prerender/prerender_field_trial.h"
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram.h"
@@ skipping 275 matching lines @@
             switches::kSpeculativeResourcePrefetching);
 
     return switch_value == switches::kSpeculativeResourcePrefetchingLearning;
   }
 
   const int group = FieldTrialList::FindValue(
       kSpeculativePrefetchingLearningTrialName);
   return group == g_speculative_prefetching_learning_default_group_number;
 }
 
+bool IsSpeculativeResourcePrefetchingEnabled(Profile* profile) {
+  if (!profile)
+    return false;
+
+  // Check if the user has set a command line flag.
+  if (CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kSpeculativeResourcePrefetching)) {
+    const std::string switch_value =
+        CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
+            switches::kSpeculativeResourcePrefetching);
+    return switch_value == switches::kSpeculativeResourcePrefetchingEnabled;
+  }
+
+  return false;
+}
+
 }  // namespace prerender