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..27c788d24e3c4a3d0c1f1e83b6a991d38be94bef 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"
@@ -301,12 +303,18 @@ string16 DownloadItemModel::GetWarningText(const gfx::Font& font,
                                            int base_width) const {
   // Should only be called if IsDangerous().
   DCHECK(IsDangerous());
+  std::string trialCondition =
+      base::FieldTrialList::FindFullName(download_util::kFinchTrialName);
   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);
-
+      if (trialCondition == "") {
+        return l10n_util::GetStringUTF16(IDS_PROMPT_MALICIOUS_DOWNLOAD_URL);
+      } else {
+        return download_util::AssembleMalwareFinchString(trialCondition,
+                                                         elided_filename);
+      }
     case content::DOWNLOAD_DANGER_TYPE_DANGEROUS_FILE:
       if (download_crx_util::IsExtensionDownload(*download_)) {
         return l10n_util::GetStringUTF16(
@@ -315,12 +323,15 @@ 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);
-
+      if (trialCondition == "") {
+        return l10n_util::GetStringFUTF16(IDS_PROMPT_MALICIOUS_DOWNLOAD_CONTENT,
+                                          elided_filename);
+      } else {
+        return download_util::AssembleMalwareFinchString(trialCondition,
+                                                         elided_filename);
+      }
     case content::DOWNLOAD_DANGER_TYPE_UNCOMMON_CONTENT:
       return l10n_util::GetStringFUTF16(IDS_PROMPT_UNCOMMON_DOWNLOAD_CONTENT,
                                         elided_filename);