[Mac] Confirm-to-quit: Add histogram metrics.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/6794030

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@80456 0039d316-1c4b-4281-b951-d872f2087c98

3 files changed, 45 insertions, 1 deletions

diff --git a/chrome/browser/app_controller_mac.mm b/chrome/browser/app_controller_mac.mm
index e9d4d07..6934219 100644
--- a/chrome/browser/app_controller_mac.mm
+++ b/chrome/browser/app_controller_mac.mm
@@ -277,8 +277,10 @@ void RecordLastRunAppBundlePath() {
 - (NSApplicationTerminateReply)applicationShouldTerminate:(NSApplication*)app {
   // Check if the preference is turned on.
   const PrefService* prefs = [self defaultProfile]->GetPrefs();
-  if (!prefs->GetBoolean(prefs::kConfirmToQuitEnabled))
+  if (!prefs->GetBoolean(prefs::kConfirmToQuitEnabled)) {
+    confirm_quit::RecordHistogram(confirm_quit::kNoConfirm);
     return NSTerminateNow;
+  }
 
   // If the application is going to terminate as the result of a Cmd+Q
   // invocation, use the special sauce to prevent accidental quitting.
diff --git a/chrome/browser/ui/cocoa/confirm_quit_panel_controller.h b/chrome/browser/ui/cocoa/confirm_quit_panel_controller.h
index 88b66f3..8a1816d 100644
--- a/chrome/browser/ui/cocoa/confirm_quit_panel_controller.h
+++ b/chrome/browser/ui/cocoa/confirm_quit_panel_controller.h
@@ -12,6 +12,26 @@
 
 @class ConfirmQuitFrameView;
 
+namespace confirm_quit {
+
+enum ConfirmQuitMetric {
+  // The user quit without having the feature enabled.
+  kNoConfirm = 0,
+  // The user held Cmd+Q for the entire duration.
+  kHoldDuration,
+  // The user hit Cmd+Q twice for the accelerated path.
+  kDoubleTap,
+  // The user tapped Cmd+Q once and then held it.
+  kTapHold,
+
+  kSampleCount
+};
+
+// Records the histogram value for the above metric.
+void RecordHistogram(ConfirmQuitMetric sample);
+
+}  // namespace confirm_quit
+
 // The ConfirmQuitPanelController manages the black HUD window that tells users
 // to "Hold Cmd+Q to Quit".
 @interface ConfirmQuitPanelController : NSWindowController<NSWindowDelegate> {
diff --git a/chrome/browser/ui/cocoa/confirm_quit_panel_controller.mm b/chrome/browser/ui/cocoa/confirm_quit_panel_controller.mm
index 1fe843c..4b44d4d 100644
--- a/chrome/browser/ui/cocoa/confirm_quit_panel_controller.mm
+++ b/chrome/browser/ui/cocoa/confirm_quit_panel_controller.mm
@@ -7,6 +7,7 @@
 
 #include "base/logging.h"
 #include "base/memory/scoped_nsobject.h"
+#include "base/metrics/histogram.h"
 #include "base/sys_string_conversions.h"
 #import "chrome/browser/ui/cocoa/confirm_quit_panel_controller.h"
 #include "grit/generated_resources.h"
@@ -24,6 +25,20 @@ const NSTimeInterval kTimeDeltaFuzzFactor = 1.0;
 // Duration of the window fade out animation.
 const NSTimeInterval kWindowFadeAnimationDuration = 0.2;
 
+// For metrics recording only: How long the user must hold the keys to
+// differentitate kDoubleTap from kTapHold.
+const NSTimeInterval kDoubleTapTimeDelta = 0.32;
+
+// Functions ///////////////////////////////////////////////////////////////////
+
+namespace confirm_quit {
+
+void RecordHistogram(ConfirmQuitMetric sample) {
+  HISTOGRAM_ENUMERATION("ConfirmToQuit", sample, kSampleCount);
+}
+
+}  // namespace confirm_quit
+
 // Custom Content View /////////////////////////////////////////////////////////
 
 // The content view of the window that draws a custom frame.
@@ -217,6 +232,12 @@ ConfirmQuitPanelController* g_confirmQuitPanelController = nil;
     NSEvent* nextEvent = [self pumpEventQueueForKeyUp:app
                                             untilDate:[NSDate distantFuture]];
     [app discardEventsMatchingMask:NSAnyEventMask beforeEvent:nextEvent];
+
+    // Based on how long the user held the keys, record the metric.
+    if ([[NSDate date] timeIntervalSinceDate:timeNow] < kDoubleTapTimeDelta)
+      confirm_quit::RecordHistogram(confirm_quit::kDoubleTap);
+    else
+      confirm_quit::RecordHistogram(confirm_quit::kTapHold);
     return NSTerminateNow;
   } else {
     [lastQuitAttempt release];  // Harmless if already nil.
@@ -263,6 +284,7 @@ ConfirmQuitPanelController* g_confirmQuitPanelController = nil;
   if (willQuit) {
     // The user held down the combination long enough that quitting should
     // happen.
+    confirm_quit::RecordHistogram(confirm_quit::kHoldDuration);
     return NSTerminateNow;
   } else {
     // Slowly fade the confirm window out in case the user doesn't