Add histograms for notification icons.

content/child/notifications/pending_notification.cc

 // Copyright 2016 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 "content/child/notifications/pending_notification.h"
 
 #include <algorithm>
 
 #include "base/barrier_closure.h"
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/location.h"
+#include "base/metrics/histogram_macros.h"
 #include "base/thread_task_runner_handle.h"
 #include "content/common/notification_constants.h"
 #include "content/public/common/notification_resources.h"
 #include "skia/ext/image_operations.h"
 #include "url/gurl.h"
 
 namespace content {
 
 namespace {
 
 // Scales down |icon| to fit within |max_size_px| if its width or height is
 // larger than |max_size_px| and returns the result. Otherwise does nothing and
 // returns |icon| unchanged.
 SkBitmap ScaleDownIfNeeded(const SkBitmap& icon, int max_size_px) {
   if (icon.width() > max_size_px || icon.height() > max_size_px) {
+    SCOPED_UMA_HISTOGRAM_TIMER("Notifications.Icon.ScaleDownTime");
     return skia::ImageOperations::Resize(icon,
                                          skia::ImageOperations::RESIZE_BEST,
                                          std::min(icon.width(), max_size_px),
                                          std::min(icon.height(), max_size_px));
   }
   return icon;
 }
 
 }  // namespace
 
@@ skipping 65 matching lines @@
 void PendingNotification::DidFetchActionIcon(size_t action_index,
                                              const SkBitmap& icon) {
   DCHECK_LT(action_index, action_icons_.size());
 
   action_icons_[action_index] =
       ScaleDownIfNeeded(icon, kPlatformNotificationMaxActionIconSizePx);
   fetches_finished_barrier_closure_.Run();
 }
 
 }  // namespace content