PDF: Add UMA to track embedded PDF triggered drive-by downloads.

chrome/browser/download/chrome_download_manager_delegate.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/download/chrome_download_manager_delegate.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/callback.h"
 #include "base/files/file_util.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/rand_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/task_runner.h"
 #include "base/task_scheduler/post_task.h"
 #include "base/threading/sequenced_worker_pool.h"
 #include "base/time/time.h"
 #include "build/build_config.h"
+#include "chrome/common/pdf_uma.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/download/download_completion_blocker.h"
 #include "chrome/browser/download/download_core_service.h"
 #include "chrome/browser/download/download_core_service_factory.h"
 #include "chrome/browser/download/download_crx_util.h"
 #include "chrome/browser/download/download_file_picker.h"
 #include "chrome/browser/download/download_history.h"
 #include "chrome/browser/download/download_item_model.h"
 #include "chrome/browser/download/download_path_reservation_tracker.h"
 #include "chrome/browser/download/download_prefs.h"
@@ skipping 166 matching lines @@
 // On Android, Chrome wants to warn the user of file overwrites rather than
 // uniquify.
 #if defined(OS_ANDROID)
 const DownloadPathReservationTracker::FilenameConflictAction
     kDefaultPlatformConflictAction = DownloadPathReservationTracker::PROMPT;
 #else
 const DownloadPathReservationTracker::FilenameConflictAction
     kDefaultPlatformConflictAction = DownloadPathReservationTracker::UNIQUIFY;
 #endif
 
+constexpr char kPDFMimeType[] = "application/pdf";
+
 }  // namespace
 
 ChromeDownloadManagerDelegate::ChromeDownloadManagerDelegate(Profile* profile)
     : profile_(profile),
       next_download_id_(content::DownloadItem::kInvalidId),
       download_prefs_(new DownloadPrefs(profile)),
       weak_ptr_factory_(this) {
 }
 
 ChromeDownloadManagerDelegate::~ChromeDownloadManagerDelegate() {
@@ skipping 57 matching lines @@
     const content::DownloadIdCallback& callback) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   DCHECK(!profile_->IsOffTheRecord());
   DCHECK_NE(content::DownloadItem::kInvalidId, next_download_id_);
   callback.Run(next_download_id_++);
 }
 
 bool ChromeDownloadManagerDelegate::DetermineDownloadTarget(
     DownloadItem* download,
     const content::DownloadTargetCallback& callback) {
+  if (download->GetTargetFilePath().empty() &&
+      download->GetMimeType() == kPDFMimeType && !download->HasUserGesture()) {
+    ReportPDFLoadStatus(PDFLoadStatus::kTriggeredNoGestureDriveByDownload);
+  }
+
   DownloadTargetDeterminer::CompletionCallback target_determined_callback =
       base::Bind(&ChromeDownloadManagerDelegate::OnDownloadTargetDetermined,
                  weak_ptr_factory_.GetWeakPtr(),
                  download->GetId(),
                  callback);
   DownloadTargetDeterminer::Start(
       download,
       GetPlatformDownloadPath(profile_, download, PLATFORM_TARGET_PATH),
       kDefaultPlatformConflictAction, download_prefs_.get(), this,
       target_determined_callback);
@@ skipping 566 matching lines @@
       path.MatchesExtension(FILE_PATH_LITERAL(".xht")) ||
       path.MatchesExtension(FILE_PATH_LITERAL(".xhtm")) ||
       path.MatchesExtension(FILE_PATH_LITERAL(".xhtml")) ||
       path.MatchesExtension(FILE_PATH_LITERAL(".xsl")) ||
       path.MatchesExtension(FILE_PATH_LITERAL(".xslt"))) {
     return true;
   }
 #endif
   return false;
 }