Set up Finch trial for malware download warnings

chrome/browser/download/download_util.h

Index: chrome/browser/download/download_util.h
diff --git a/chrome/browser/download/download_util.h b/chrome/browser/download/download_util.h
index 60288a31007a692d4728603f20904f2f23b1419d..36a92f0b36d08cf2d9efd57c8f20953e8075a409 100644
--- a/chrome/browser/download/download_util.h
+++ b/chrome/browser/download/download_util.h
@@ -13,6 +13,7 @@
 #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)
@@ -115,6 +116,28 @@ 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_