--- a/gfx/webrender_bindings/webrender_ffi_generated.h
+++ b/gfx/webrender_bindings/webrender_ffi_generated.h
@@ -1,13 +1,13 @@
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-/* Generated with cbindgen:0.1.25 */
+/* Generated with cbindgen:0.1.28 */
 
 /* DO NOT MODIFY THIS MANUALLY! This file was generated using cbindgen.
  * To generate this file:
  *   1. Get the latest cbindgen using `cargo install --force cbindgen`
  *      a. Alternatively, you can clone `https://github.com/rlhunt/cbindgen` and use a tagged release
  *   2. Run `rustup run nightly cbindgen toolkit/library/rust/ --crate webrender_bindings -o gfx/webrender_bindings/webrender_ffi_generated.h`
  */
 
@@ -314,16 +314,27 @@ struct WrOpacityProperty {
   float opacity;
 
   bool operator==(const WrOpacityProperty& aOther) const {
     return id == aOther.id &&
            opacity == aOther.opacity;
   }
 };
 
+// A 3d transform stored as a 4 by 4 matrix in row-major order in memory.
+//
+// Transforms can be parametrized over the source and destination units, to describe a
+// transformation from a space to another.
+// For example, `TypedTransform3D<f32, WordSpace, ScreenSpace>::transform_point3d`
+// takes a `TypedPoint3D<f32, WordSpace>` and returns a `TypedPoint3D<f32, ScreenSpace>`.
+//
+// Transforms expose a set of convenience methods for pre- and post-transformations.
+// A pre-transformation corresponds to adding an operation that is applied before
+// the rest of the transformation, while a post-transformation adds an operation
+// that is applied after.
 struct TypedTransform3D_f32__LayoutPixel__LayoutPixel {
   float m11;
   float m12;
   float m13;
   float m14;
   float m21;
   float m22;
   float m23;
@@ -396,16 +407,17 @@ struct ColorF {
   bool operator==(const ColorF& aOther) const {
     return r == aOther.r &&
            g == aOther.g &&
            b == aOther.b &&
            a == aOther.a;
   }
 };
 
+// A 2d Point tagged with a unit.
 struct TypedPoint2D_f32__LayerPixel {
   float x;
   float y;
 
   bool operator==(const TypedPoint2D_f32__LayerPixel& aOther) const {
     return x == aOther.x &&
            y == aOther.y;
   }
@@ -565,16 +577,17 @@ struct NinePatchDescriptor {
 
   bool operator==(const NinePatchDescriptor& aOther) const {
     return width == aOther.width &&
            height == aOther.height &&
            slice == aOther.slice;
   }
 };
 
+// A 2d Vector tagged with a unit.
 struct TypedVector2D_f32__LayerPixel {
   float x;
   float y;
 
   bool operator==(const TypedVector2D_f32__LayerPixel& aOther) const {
     return x == aOther.x &&
            y == aOther.y;
   }
@@ -645,16 +658,17 @@ struct ByteSlice {
   size_t len;
 
   bool operator==(const ByteSlice& aOther) const {
     return buffer == aOther.buffer &&
            len == aOther.len;
   }
 };
 
+// A 2d Point tagged with a unit.
 struct TypedPoint2D_u16__Tiles {
   uint16_t x;
   uint16_t y;
 
   bool operator==(const TypedPoint2D_u16__Tiles& aOther) const {
     return x == aOther.x &&
            y == aOther.y;
   }
@@ -791,20 +805,20 @@ struct FontInstancePlatformOptions {
     return use_embedded_bitmap == aOther.use_embedded_bitmap &&
            force_gdi_rendering == aOther.force_gdi_rendering;
   }
 };
 #endif
 
 #if defined(XP_MACOSX)
 struct FontInstancePlatformOptions {
-  uint32_t unused;
+  bool font_smoothing;
 
   bool operator==(const FontInstancePlatformOptions& aOther) const {
-    return unused == aOther.unused;
+    return font_smoothing == aOther.font_smoothing;
   }
 };
 #endif
 
 #if !(defined(XP_MACOSX) || defined(XP_WIN))
 struct FontInstancePlatformOptions {
   uint16_t flags;
   FontLCDFilter lcd_filter;

--- a/toolkit/library/gtest/rust/Cargo.lock
+++ b/toolkit/library/gtest/rust/Cargo.lock
@@ -1561,17 +1561,17 @@ source = "registry+https://github.com/ru
 dependencies = [
  "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "same-file 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "webrender"
-version = "0.53.0"
+version = "0.53.1"
 dependencies = [
  "app_units 0.5.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "bincode 0.9.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "bitflags 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "byteorder 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "core-foundation 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "core-graphics 0.9.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "core-text 7.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1583,22 +1583,22 @@ dependencies = [
  "gleam 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "num-traits 0.1.39 (registry+https://github.com/rust-lang/crates.io-index)",
  "plane-split 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rayon 0.8.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "thread_profiler 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "time 0.1.36 (registry+https://github.com/rust-lang/crates.io-index)",
- "webrender_api 0.53.0",
+ "webrender_api 0.53.1",
 ]
 
 [[package]]
 name = "webrender_api"
-version = "0.53.0"
+version = "0.53.1"
 dependencies = [
  "app_units 0.5.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "bincode 0.9.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "bitflags 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "byteorder 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "core-foundation 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "core-graphics 0.9.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "dwrote 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1612,18 +1612,18 @@ name = "webrender_bindings"
 version = "0.1.0"
 dependencies = [
  "app_units 0.5.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "bincode 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "euclid 0.15.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "gleam 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "rayon 0.8.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "thread_profiler 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "webrender 0.53.0",
- "webrender_api 0.53.0",
+ "webrender 0.53.1",
+ "webrender_api 0.53.1",
 ]
 
 [[package]]
 name = "winapi"
 version = "0.2.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]

--- a/toolkit/library/rust/Cargo.lock
+++ b/toolkit/library/rust/Cargo.lock
@@ -1573,17 +1573,17 @@ source = "registry+https://github.com/ru
 dependencies = [
  "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "same-file 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "webrender"
-version = "0.53.0"
+version = "0.53.1"
 dependencies = [
  "app_units 0.5.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "bincode 0.9.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "bitflags 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "byteorder 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "core-foundation 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "core-graphics 0.9.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "core-text 7.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1595,22 +1595,22 @@ dependencies = [
  "gleam 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "num-traits 0.1.39 (registry+https://github.com/rust-lang/crates.io-index)",
  "plane-split 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rayon 0.8.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "thread_profiler 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "time 0.1.36 (registry+https://github.com/rust-lang/crates.io-index)",
- "webrender_api 0.53.0",
+ "webrender_api 0.53.1",
 ]
 
 [[package]]
 name = "webrender_api"
-version = "0.53.0"
+version = "0.53.1"
 dependencies = [
  "app_units 0.5.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "bincode 0.9.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "bitflags 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "byteorder 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "core-foundation 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "core-graphics 0.9.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "dwrote 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1624,18 +1624,18 @@ name = "webrender_bindings"
 version = "0.1.0"
 dependencies = [
  "app_units 0.5.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "bincode 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "euclid 0.15.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "gleam 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "rayon 0.8.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "thread_profiler 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "webrender 0.53.0",
- "webrender_api 0.53.0",
+ "webrender 0.53.1",
+ "webrender_api 0.53.1",
 ]
 
 [[package]]
 name = "winapi"
 version = "0.2.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]