Bug 1502585 - Update webrender to commit e162264c2c2c1bbc3e57429e015af45018f1023b (WR PR 3252). r=kats

Depends on D10342

Differential Revision: https://phabricator.services.mozilla.com/D10343

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

gfx/webrender/src/prim_store.rs

@@ -3167,7 +3167,7 @@ impl PrimitiveInstance {
                         }
                         PrimitiveOpacity::from_alpha(opacity_binding.current * color.a)
                     }
-                    BrushKind::Clear => PrimitiveOpacity::opaque(),
+                    BrushKind::Clear => PrimitiveOpacity::translucent(),
                 }
             }
         };

gfx/webrender_bindings/revision.txt

@@ -1 +1 @@
-62af01cdf4f09f8f403e4f66f067e8db7ae42329
+e162264c2c2c1bbc3e57429e015af45018f1023b