Reland: Notifications: Split up image loading histograms by image type

third_party/WebKit/Source/modules/notifications/NotificationImageLoader.h

Index: third_party/WebKit/Source/modules/notifications/NotificationImageLoader.h
diff --git a/third_party/WebKit/Source/modules/notifications/NotificationImageLoader.h b/third_party/WebKit/Source/modules/notifications/NotificationImageLoader.h
index ea0cc3d4a9c541bf763eb3fbcf0b578503130d98..46e6be46c399c734f96f6cb5aea2d0a1a5cde986 100644
--- a/third_party/WebKit/Source/modules/notifications/NotificationImageLoader.h
+++ b/third_party/WebKit/Source/modules/notifications/NotificationImageLoader.h
@@ -10,12 +10,11 @@
 #include "modules/ModulesExport.h"
 #include "platform/SharedBuffer.h"
 #include "platform/heap/Handle.h"
+#include "third_party/skia/include/core/SkBitmap.h"
 #include "wtf/Functional.h"
 #include "wtf/RefPtr.h"
 #include <memory>
 
-class SkBitmap;
-
 namespace blink {
 
 class ExecutionContext;
@@ -28,13 +27,20 @@ class MODULES_EXPORT NotificationImageLoader final
     : public GarbageCollectedFinalized<NotificationImageLoader>,
       public ThreadableLoaderClient {
  public:
+  // Type names are used in UMAs, so do not rename.
+  enum class Type { Image, Icon, Badge, ActionIcon };
+
   // The bitmap may be empty if the request failed or the image data could not
   // be decoded.
   using ImageCallback = Function<void(const SkBitmap&)>;
 
-  NotificationImageLoader();
+  explicit NotificationImageLoader(Type);
   ~NotificationImageLoader() override;
 
+  // Scales down |image| according to its type and returns result. If it is
+  // already small enough, |image| is returned unchanged.
+  static SkBitmap scaleDownIfNeeded(const SkBitmap& image, Type);
+
   // Asynchronously downloads an image from the given url, decodes the loaded
   // data, and passes the bitmap to the callback. Times out if the load takes
   // too long and ImageCallback is invoked with an empty bitmap.
@@ -56,6 +62,7 @@ class MODULES_EXPORT NotificationImageLoader final
  private:
   void runCallbackWithEmptyBitmap();
 
+  Type m_type;
   bool m_stopped;
   double m_startTime;
   RefPtr<SharedBuffer> m_data;