Add histograms for notification icons.

content/child/notifications/notification_image_loader.cc

Index: content/child/notifications/notification_image_loader.cc
diff --git a/content/child/notifications/notification_image_loader.cc b/content/child/notifications/notification_image_loader.cc
index 08a108a33b30e207c29f5fad895a77f53791bd88..4ad37f859941e4efe8232a278c06f28a5ff86f80 100644
--- a/content/child/notifications/notification_image_loader.cc
+++ b/content/child/notifications/notification_image_loader.cc
@@ -7,6 +7,7 @@
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/logging.h"
+#include "base/metrics/histogram_macros.h"
 #include "base/single_thread_task_runner.h"
 #include "content/child/image_decoder.h"
 #include "third_party/WebKit/public/platform/Platform.h"
@@ -39,6 +40,8 @@ void NotificationImageLoader::StartOnMainThread(const GURL& image_url) {
   DCHECK(main_task_runner_->BelongsToCurrentThread());
   DCHECK(!url_loader_);
 
+  start_time_ = base::TimeTicks::Now();
+
   WebURL image_web_url(image_url);
   WebURLRequest request(image_web_url);
   request.setRequestContext(WebURLRequest::RequestContextImage);
@@ -63,6 +66,9 @@ void NotificationImageLoader::didFinishLoading(
     int64_t total_encoded_data_length) {
   DCHECK(!completed_);
 
+  UMA_HISTOGRAM_LONG_TIMES("Notifications.Icon.LoadFinishTime",
+                           base::TimeTicks::Now() - start_time_);
+
   RunCallbackOnWorkerThread();
 }
 
@@ -71,6 +77,9 @@ void NotificationImageLoader::didFail(WebURLLoader* loader,
   if (completed_)
     return;
 
+  UMA_HISTOGRAM_LONG_TIMES("Notifications.Icon.LoadFailTime",
+                           base::TimeTicks::Now() - start_time_);
+
   RunCallbackOnWorkerThread();
 }
 
@@ -89,6 +98,10 @@ void NotificationImageLoader::RunCallbackOnWorkerThread() {
 
 SkBitmap NotificationImageLoader::GetDecodedImage() const {
   DCHECK(completed_);
+
+  UMA_HISTOGRAM_CUSTOM_COUNTS("Notifications.Icon.FileSize", buffer_.size(), 1,
+                              10000000 /* ~10mb */, 50);
+
   if (buffer_.empty())
     return SkBitmap();