Bug 1680387 - Read and expose EXIF image resolution data. r=tnikkel,aosmond

Differential Revision: https://phabricator.services.mozilla.com/D113264

image/DynamicImage.cpp

@@ -13,6 +13,7 @@
 #include "mozilla/SVGImageContext.h"
 #include "ImageRegion.h"
 #include "Orientation.h"
+#include "mozilla/image/Resolution.h"
 
 #include "mozilla/MemoryReporting.h"
 
@@ -113,6 +114,9 @@ Maybe<AspectRatio> DynamicImage::GetIntrinsicRatio() {
 NS_IMETHODIMP_(Orientation)
 DynamicImage::GetOrientation() { return Orientation(); }
 
+NS_IMETHODIMP_(Resolution)
+DynamicImage::GetResolution() { return {}; }
+
 NS_IMETHODIMP
 DynamicImage::GetType(uint16_t* aType) {
   *aType = imgIContainer::TYPE_RASTER;