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/VectorImage.cpp

@@ -852,6 +852,17 @@ VectorImage::GetImageContainerAtSize(WindowRenderer* aRenderer,
   return rv;
 }
 
+//******************************************************************************
+NS_IMETHODIMP_(ImgDrawResult)
+VectorImage::GetImageProvider(WindowRenderer* aRenderer,
+                              const gfx::IntSize& aSize,
+                              const Maybe<SVGImageContext>& aSVGContext,
+                              const Maybe<ImageIntRegion>& aRegion,
+                              uint32_t aFlags,
+                              WebRenderImageProvider** aProvider) {
+  return ImgDrawResult::NOT_SUPPORTED;
+}
+
 bool VectorImage::MaybeRestrictSVGContext(
     Maybe<SVGImageContext>& aNewSVGContext,
     const Maybe<SVGImageContext>& aSVGContext, uint32_t aFlags) {