Bug 1511244 - Update webrender to commit a48f34e09901a62ab12164c8e539011ed04d41bd (WR PR #3372). r=kats

https://github.com/servo/webrender/pull/3372

Differential Revision: https://phabricator.services.mozilla.com/D13495

--HG--
extra : moz-landing-system : lando

gfx/webrender_bindings/revision.txt

@@ -1 +1 @@
-a2b4202242d937d328eda21c2d9fcfece609283e
+a48f34e09901a62ab12164c8e539011ed04d41bd

gfx/wr/webrender/src/resource_cache.rs

@@ -1063,6 +1063,10 @@ impl ResourceCache {
 
                 assert!(!descriptor.rect.is_empty());
 
+                if !self.blob_image_templates.contains_key(&request.key) {
+                    panic!("already missing blob image key {:?} deleted: {:?}", request, self.deleted_blob_keys);
+                }
+
                 self.missing_blob_images.push(
                     BlobImageParams {
                         request,