Bug 1711061 - Part 2. Add imgIContainer::GetImageProvider skeleton. r=tnikkel

In later parts in this series, GetImageProvider will replace
GetImageContainerAtSize. This will be a more specialized and lower
overhead means to get a wr::ImageKey for a particular surface.

Differential Revision: https://phabricator.services.mozilla.com/D126596

image/DynamicImage.cpp

@@ -179,6 +179,16 @@ DynamicImage::GetImageContainerAtSize(WindowRenderer* aRenderer,
   return ImgDrawResult::NOT_SUPPORTED;
 }
 
+NS_IMETHODIMP_(ImgDrawResult)
+DynamicImage::GetImageProvider(WindowRenderer* aRenderer,
+                               const gfx::IntSize& aSize,
+                               const Maybe<SVGImageContext>& aSVGContext,
+                               const Maybe<ImageIntRegion>& aRegion,
+                               uint32_t aFlags,
+                               WebRenderImageProvider** aProvider) {
+  return ImgDrawResult::NOT_SUPPORTED;
+}
+
 NS_IMETHODIMP_(ImgDrawResult)
 DynamicImage::Draw(gfxContext* aContext, const nsIntSize& aSize,
                    const ImageRegion& aRegion, uint32_t aWhichFrame,