Set up Finch trial for malware download warnings

chrome/browser/download/download_item_model.cc

Index: chrome/browser/download/download_item_model.cc
diff --git a/chrome/browser/download/download_item_model.cc b/chrome/browser/download/download_item_model.cc
index b1c89fca2b294f477212fae55762f12646996472..83c62f9e0ae7a7ae0a91f144790027615a46ac92 100644
--- a/chrome/browser/download/download_item_model.cc
+++ b/chrome/browser/download/download_item_model.cc
@@ -6,12 +6,14 @@
 
 #include "base/i18n/number_formatting.h"
 #include "base/i18n/rtl.h"
+#include "base/metrics/field_trial.h"
 #include "base/strings/string16.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/supports_user_data.h"
 #include "base/time/time.h"
 #include "chrome/browser/download/download_crx_util.h"
+#include "chrome/browser/download/download_util.h"
 #include "chrome/browser/safe_browsing/download_feedback_service.h"
 #include "content/public/browser/download_danger_type.h"
 #include "content/public/browser/download_interrupt_reasons.h"
@@ -304,10 +306,15 @@ string16 DownloadItemModel::GetWarningText(const gfx::Font& font,
   string16 elided_filename =
       ui::ElideFilename(download_->GetFileNameToReportUser(), font, base_width);
   switch (download_->GetDangerType()) {
-    case content::DOWNLOAD_DANGER_TYPE_DANGEROUS_URL:
-      return l10n_util::GetStringUTF16(IDS_PROMPT_MALICIOUS_DOWNLOAD_URL);
-
-    case content::DOWNLOAD_DANGER_TYPE_DANGEROUS_FILE:
+    case content::DOWNLOAD_DANGER_TYPE_DANGEROUS_URL: {
+      std::string trial_condition =
+          base::FieldTrialList::FindFullName(download_util::kFinchTrialName);
+      if (trial_condition.empty())
+        return l10n_util::GetStringUTF16(IDS_PROMPT_MALICIOUS_DOWNLOAD_URL);
+      return download_util::AssembleMalwareFinchString(trial_condition,
+                                                       elided_filename);
+    }
+    case content::DOWNLOAD_DANGER_TYPE_DANGEROUS_FILE: {
       if (download_crx_util::IsExtensionDownload(*download_)) {
         return l10n_util::GetStringUTF16(
             IDS_PROMPT_DANGEROUS_DOWNLOAD_EXTENSION);
@@ -315,25 +322,32 @@ string16 DownloadItemModel::GetWarningText(const gfx::Font& font,
         return l10n_util::GetStringFUTF16(IDS_PROMPT_DANGEROUS_DOWNLOAD,
                                           elided_filename);
       }
-
+    }
     case content::DOWNLOAD_DANGER_TYPE_DANGEROUS_CONTENT:
-    case content::DOWNLOAD_DANGER_TYPE_DANGEROUS_HOST:
-      return l10n_util::GetStringFUTF16(IDS_PROMPT_MALICIOUS_DOWNLOAD_CONTENT,
-                                        elided_filename);
-
-    case content::DOWNLOAD_DANGER_TYPE_UNCOMMON_CONTENT:
+    case content::DOWNLOAD_DANGER_TYPE_DANGEROUS_HOST: {
+      std::string trial_condition =
+          base::FieldTrialList::FindFullName(download_util::kFinchTrialName);
+      if (trial_condition.empty()) {
+        return l10n_util::GetStringFUTF16(IDS_PROMPT_MALICIOUS_DOWNLOAD_CONTENT,
+                                          elided_filename);
+      }
+      return download_util::AssembleMalwareFinchString(trial_condition,
+                                                       elided_filename);
+    }
+    case content::DOWNLOAD_DANGER_TYPE_UNCOMMON_CONTENT: {
       return l10n_util::GetStringFUTF16(IDS_PROMPT_UNCOMMON_DOWNLOAD_CONTENT,
                                         elided_filename);
-
-    case content::DOWNLOAD_DANGER_TYPE_POTENTIALLY_UNWANTED:
+    }
+    case content::DOWNLOAD_DANGER_TYPE_POTENTIALLY_UNWANTED: {
       return l10n_util::GetStringFUTF16(
           IDS_PROMPT_DOWNLOAD_CHANGES_SEARCH_SETTINGS, elided_filename);
-
+    }
     case content::DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS:
     case content::DOWNLOAD_DANGER_TYPE_MAYBE_DANGEROUS_CONTENT:
     case content::DOWNLOAD_DANGER_TYPE_USER_VALIDATED:
-    case content::DOWNLOAD_DANGER_TYPE_MAX:
+    case content::DOWNLOAD_DANGER_TYPE_MAX: {
       break;
+    }
   }
   NOTREACHED();
   return string16();