Experience sampling instrumentation for dangerous downloads warnings

chrome/browser/ui/views/download/download_item_view.cc

Index: chrome/browser/ui/views/download/download_item_view.cc
diff --git a/chrome/browser/ui/views/download/download_item_view.cc b/chrome/browser/ui/views/download/download_item_view.cc
index d1f91a1e62d79c50c789a8be8cc63a18a74b932b..d62f89ec6cdb59fe9151c7834bec7dae080a1524 100644
--- a/chrome/browser/ui/views/download/download_item_view.cc
+++ b/chrome/browser/ui/views/download/download_item_view.cc
@@ -23,6 +23,7 @@
 #include "chrome/browser/download/download_item_model.h"
 #include "chrome/browser/download/download_stats.h"
 #include "chrome/browser/download/drag_download_item.h"
+#include "chrome/browser/extensions/api/experience_sampling_private/experience_sampling.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/safe_browsing/download_feedback_service.h"
 #include "chrome/browser/safe_browsing/download_protection_service.h"
@@ -54,6 +55,7 @@
 #include "ui/views/widget/widget.h"
 
 using content::DownloadItem;
+using extensions::ExperienceSamplingEvent;
 
 // TODO(paulg): These may need to be adjusted when download progress
 //              animation is added, and also possibly to take into account
@@ -92,6 +94,10 @@ static const int kDisabledOnOpenDuration = 3000;
 // light-on-dark themes.
 static const double kDownloadItemLuminanceMod = 0.8;
 
+// Constants for the Experience Sampling instrumentation.
+const char kEventNameMalicious[] = "download_warning_malicious";
+const char kEventNameDangerous[] = "download_warning_dangerous";
+
 namespace {
 
 // Callback for DownloadShelf paint functions to mirror the progress animation
@@ -230,6 +236,12 @@ DownloadItemView::DownloadItemView(DownloadItem* download_item,
 DownloadItemView::~DownloadItemView() {
   StopDownloadProgress();
   download()->RemoveObserver(this);
+
+  // Experience Sampling: If the user took no action to remove the warning
+  // before it disappeared, then the user effectively dismissed the download
+  // without keeping it.
+  if (mode_ == DANGEROUS_MODE || mode_ == MALICIOUS_MODE)
+    sampling_event_->CreateUserDecisionEvent(ExperienceSamplingEvent::kDeny);
 }
 
 // Progress animation handlers.
@@ -1127,6 +1139,9 @@ void DownloadItemView::ClearWarningDialog() {
   body_state_ = NORMAL;
   drop_down_state_ = NORMAL;
 
+  // ExperienceSampling: User proceeded through the warning.
+  sampling_event_->CreateUserDecisionEvent(ExperienceSamplingEvent::kProceed);
+
   // Remove the views used by the warning dialog.
   if (save_button_) {
     RemoveChildView(save_button_);
@@ -1170,6 +1185,17 @@ void DownloadItemView::ShowWarningDialog() {
 #endif
   mode_ = model_.MightBeMalicious() ? MALICIOUS_MODE : DANGEROUS_MODE;
 
+  // ExperienceSampling: Dangerous or malicious download warning is being shown
+  // to the user, so we start a new SamplingEvent and track it.
+  std::string event_name = model_.MightBeMalicious() ?
+      kEventNameMalicious
+      : kEventNameDangerous;
+  sampling_event_.reset(new ExperienceSamplingEvent(
+      event_name,
+      download()->GetURL(),
+      download()->GetReferrerUrl(),
+      download()->GetBrowserContext()));
+
   body_state_ = NORMAL;
   drop_down_state_ = NORMAL;
   if (mode_ == DANGEROUS_MODE) {