Reland Safebrowsing: allow sending enhanced download protection pings on OSX.

chrome/browser/safe_browsing/download_protection_service.cc

Index: chrome/browser/safe_browsing/download_protection_service.cc
diff --git a/chrome/browser/safe_browsing/download_protection_service.cc b/chrome/browser/safe_browsing/download_protection_service.cc
index a17daed873d442c687861883db4232a7f98c3ff5..bedb410f78e37d46c398c8c4deef340140d978b3 100644
--- a/chrome/browser/safe_browsing/download_protection_service.cc
+++ b/chrome/browser/safe_browsing/download_protection_service.cc
@@ -9,6 +9,7 @@
 #include "base/format_macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
+#include "base/metrics/field_trial.h"
 #include "base/metrics/histogram.h"
 #include "base/metrics/sparse_histogram.h"
 #include "base/sequenced_task_runner_helpers.h"
@@ -615,7 +616,15 @@ class DownloadProtectionService::CheckClientDownloadRequest
     // Currently, the UI only works on Windows so we don't even bother with
     // pinging the server if we're not on Windows.
     // TODO(noelutz): change this code once the UI is done for Linux and Mac.
-#if defined(OS_WIN)
+#if defined(OS_MACOSX)
+  // TODO(mattm): remove this (see crbug.com/414834).
+  if (base::FieldTrialList::FindFullName("SafeBrowsingOSXClientDownloadPings")
+      != "Enabled") {
+    PostFinishTask(UNKNOWN, REASON_OS_NOT_SUPPORTED);
+    return;
+  }
+#endif
+#if defined(OS_WIN) || defined(OS_MACOSX)
     // The URLFetcher is owned by the UI thread, so post a message to
     // start the pingback.
     BrowserThread::PostTask(
@@ -780,6 +789,13 @@ class DownloadProtectionService::CheckClientDownloadRequest
       UMA_HISTOGRAM_ENUMERATION("SBClientDownload.CheckDownloadStats",
                                 reason,
                                 REASON_MAX);
+#if defined(OS_MACOSX)
+      // OSX is currently sending pings only for evaluation purposes, ignore
+      // the result for now.
+      // TODO(mattm): remove this and update the ifdef in
+      // DownloadItemImpl::IsDangerous (see crbug.com/413968).
+      result = UNKNOWN;
+#endif
       callback_.Run(result);
       item_->RemoveObserver(this);
       item_ = NULL;
@@ -929,18 +945,17 @@ void DownloadProtectionService::CheckDownloadUrl(
 bool DownloadProtectionService::IsSupportedDownload(
     const content::DownloadItem& item,
     const base::FilePath& target_path) const {
-  // Currently, the UI only works on Windows.  On Linux and Mac we still
+  // Currently, the UI is only enabled on Windows.  On Mac we send the ping but
+  // ignore the result (see ifdef in FinishRequest).  On Linux we still
   // want to show the dangerous file type warning if the file is possibly
   // dangerous which means we have to always return false here.
 #if defined(OS_WIN)
   DownloadCheckResultReason reason = REASON_MAX;
   ClientDownloadRequest::DownloadType type =
       ClientDownloadRequest::WIN_EXECUTABLE;
-  return (CheckClientDownloadRequest::IsSupportedDownload(item, target_path,
-                                                          &reason, &type) &&
-          (ClientDownloadRequest::ANDROID_APK == type ||
-           ClientDownloadRequest::WIN_EXECUTABLE == type ||
-           ClientDownloadRequest::ZIPPED_EXECUTABLE == type));
+  return (CheckClientDownloadRequest::IsSupportedDownload(
+              item, target_path, &reason, &type) &&
+          (ClientDownloadRequest::CHROME_EXTENSION != type));
 #else
   return false;
 #endif