Add support to sha256 hash the downloaded file....

chrome/browser/safe_browsing/safe_browsing_service.cc

Index: chrome/browser/safe_browsing/safe_browsing_service.cc
===================================================================
--- chrome/browser/safe_browsing/safe_browsing_service.cc	(revision 70630)
+++ chrome/browser/safe_browsing/safe_browsing_service.cc	(working copy)
@@ -47,6 +47,7 @@
 const char* const kSbDefaultMacKeyURLPrefix =
     "https://sb-ssl.google.com/safebrowsing";
 
+// TODO(lzheng): Replace this with Profile* ProfileManager::GetDefaultProfile().
 Profile* GetDefaultProfile() {
   FilePath user_data_dir;
   PathService::Get(chrome::DIR_USER_DATA, &user_data_dir);
@@ -154,6 +155,20 @@
          url.SchemeIs(chrome::kHttpsScheme);
 }
 
+// Only report SafeBrowsing related stats when UMA is enabled and
+// safe browsing is enabled.
+bool SafeBrowsingService::CanReportStats() const {
+  const MetricsService* metrics = g_browser_process->metrics_service();
+  const PrefService* pref_service = GetDefaultProfile()->GetPrefs();
+  return metrics && metrics->reporting_active() &&
+      pref_service && pref_service->GetBoolean(prefs::kSafeBrowsingEnabled);
+}
+
+// Binhash verification is only enabled for UMA users for now.
+bool SafeBrowsingService::DownloadBinHashNeeded() const {
+  return enable_download_protection_ && CanReportStats();
+}
+
 void SafeBrowsingService::CheckDownloadUrlDone(
     SafeBrowsingCheck* check, UrlCheckResult result) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));