Set up Finch trial for malware download warnings

chrome/browser/ui/webui/downloads_dom_handler.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/ui/webui/downloads_dom_handler.h"
 
 #include <algorithm>
 #include <functional>
 
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/i18n/rtl.h"
 #include "base/i18n/time_formatting.h"
 #include "base/memory/singleton.h"
+#include "base/metrics/field_trial.h"
 #include "base/metrics/histogram.h"
 #include "base/prefs/pref_service.h"
 #include "base/strings/string_piece.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/threading/thread.h"
 #include "base/value_conversions.h"
 #include "base/values.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/download/download_crx_util.h"
 #include "chrome/browser/download/download_danger_prompt.h"
@@ skipping 134 matching lines @@
   file_value->SetString("file_name", file_name);
   file_value->SetString("url", download_item->GetURL().spec());
   file_value->SetBoolean("otr", incognito);
   file_value->SetInteger("total", static_cast<int>(
       download_item->GetTotalBytes()));
   file_value->SetBoolean("file_externally_removed",
                          download_item->GetFileExternallyRemoved());
   file_value->SetBoolean("retry", false); // Overridden below if needed.
   file_value->SetBoolean("resume", download_item->CanResume());
 
+  std::string trial_condition =
+      base::FieldTrialList::FindFullName(download_util::kFinchTrialName);
+
   switch (download_item->GetState()) {
     case content::DownloadItem::IN_PROGRESS:
       if (download_item->IsDangerous()) {
         file_value->SetString("state", "DANGEROUS");
         // These are the only danger states that the UI is equipped to handle.
         DCHECK(download_item->GetDangerType() ==
                    content::DOWNLOAD_DANGER_TYPE_DANGEROUS_FILE ||
                download_item->GetDangerType() ==
                    content::DOWNLOAD_DANGER_TYPE_DANGEROUS_URL ||
                download_item->GetDangerType() ==
                    content::DOWNLOAD_DANGER_TYPE_DANGEROUS_CONTENT ||
                download_item->GetDangerType() ==
                    content::DOWNLOAD_DANGER_TYPE_UNCOMMON_CONTENT ||
                download_item->GetDangerType() ==
                    content::DOWNLOAD_DANGER_TYPE_DANGEROUS_HOST ||
                download_item->GetDangerType() ==
                    content::DOWNLOAD_DANGER_TYPE_POTENTIALLY_UNWANTED);
         const char* danger_type_value =
             GetDangerTypeString(download_item->GetDangerType());
         file_value->SetString("danger_type", danger_type_value);
+        if (!trial_condition.empty()) {
+          string16 finch_string;
+          content::DownloadDangerType danger_type =
+              download_item->GetDangerType();
+          if (danger_type == content::DOWNLOAD_DANGER_TYPE_DANGEROUS_URL ||
+              danger_type == content::DOWNLOAD_DANGER_TYPE_DANGEROUS_CONTENT ||
+              danger_type == content::DOWNLOAD_DANGER_TYPE_DANGEROUS_HOST) {
+            finch_string = download_util::AssembleMalwareFinchString(
+                trial_condition, file_name);
+          }
+          file_value->SetString("finch_string", finch_string);
+        }
       } else if (download_item->IsPaused()) {
         file_value->SetString("state", "PAUSED");
       } else {
         file_value->SetString("state", "IN_PROGRESS");
       }
 
       file_value->SetString("progress_status_text",
           download_util::GetProgressStatusText(download_item));
 
       file_value->SetInteger("percent",
@@ skipping 382 matching lines @@
 }
 
 void DownloadsDOMHandler::CallDownloadsList(const base::ListValue& downloads) {
   web_ui()->CallJavascriptFunction("downloadsList", downloads);
 }
 
 void DownloadsDOMHandler::CallDownloadUpdated(
     const base::ListValue& download_item) {
   web_ui()->CallJavascriptFunction("downloadUpdated", download_item);
 }