Set up Finch trial for malware download warnings

chrome/browser/download/download_util.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.
 //
 // Download utilities.
 
 #ifndef CHROME_BROWSER_DOWNLOAD_DOWNLOAD_UTIL_H_
 #define CHROME_BROWSER_DOWNLOAD_DOWNLOAD_UTIL_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/files/file_path.h"
 #include "base/memory/ref_counted.h"
 #include "base/strings/string16.h"
+#include "base/strings/string_util.h"
 #include "ui/gfx/native_widget_types.h"
 
 #if defined(TOOLKIT_VIEWS)
 #include "ui/views/view.h"
 #endif
 
 class GURL;
 
 namespace base {
 class DictionaryValue;
@@ skipping 82 matching lines @@
 
   CHROME_DOWNLOAD_SOURCE_LAST_ENTRY,
 };
 
 // Increment one of the above counts.
 void RecordDownloadCount(ChromeDownloadCountTypes type);
 
 // Record initiation of a download from a specific source.
 void RecordDownloadSource(ChromeDownloadSource source);
 
+// Summer/Fall 2013 Finch experiment strings -----------------------------------
+// Only deployed to English speakers, don't need translation.
+
+// Study and condition names.
+extern const char kFinchTrialName[];
+extern const char kCondition1Control[];
+extern const char kCondition2Control[];
+extern const char kCondition3Malicious[];
+extern const char kCondition4Unsafe[];
+extern const char kCondition5Dangerous[];
+extern const char kCondition6Harmful[];
+extern const char kCondition7DiscardSecond[];
+extern const char kCondition8DiscardFirst[];
+extern const char kCondition9SafeDiscard[];
+extern const char kCondition10SafeDontRun[];
+
+// Helper for getting the appropriate message for a Finch trial.
+// You should only invoke this if you believe you're in the kFinchTrialName
+// finch trial; if you aren't, use the default string and don't invoke this.
+base::string16 AssembleMalwareFinchString(const std::string& trial_condition,
+                                          const string16& elided_filename);
+
 }  // namespace download_util
 
 #endif  // CHROME_BROWSER_DOWNLOAD_DOWNLOAD_UTIL_H_