Auto merge of #16303 - froydnj:rayon-version-bump, r=jdm

bump required rayon version to 0.7

...and bring jpeg-decoder along for the ride.  Minor tweaks were necessary because of rayon API changes.

- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors

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components/layout/Cargo.toml

@@ -30,7 +30,7 @@ ordered-float = "0.4"
 parking_lot = "0.3.3"
 profile_traits = {path = "../profile_traits"}
 range = {path = "../range"}
-rayon = "0.6"
+rayon = "0.7"
 script_layout_interface = {path = "../script_layout_interface"}
 script_traits = {path = "../script_traits"}
 selectors = { path = "../selectors" }

components/layout_thread/Cargo.toml

@@ -25,7 +25,7 @@ msg = {path = "../msg"}
 net_traits = {path = "../net_traits"}
 parking_lot = {version = "0.3.3", features = ["nightly"]}
 profile_traits = {path = "../profile_traits"}
-rayon = "0.6"
+rayon = "0.7"
 script = {path = "../script"}
 script_layout_interface = {path = "../script_layout_interface"}
 script_traits = {path = "../script_traits"}

components/layout_thread/lib.rs

@@ -398,7 +398,7 @@ impl LayoutThread {
             opts::get().initial_window_size.to_f32() * ScaleFactor::new(1.0));
 
         let configuration =
-            rayon::Configuration::new().set_num_threads(layout_threads);
+            rayon::Configuration::new().num_threads(layout_threads);
         let parallel_traversal = rayon::ThreadPool::new(configuration).ok();
         debug!("Possible layout Threads: {}", layout_threads);
 

components/style/Cargo.toml

@@ -47,7 +47,7 @@ ordered-float = "0.4"
 parking_lot = "0.3.3"
 pdqsort = "0.1.0"
 precomputed-hash = "0.1"
-rayon = "0.6"
+rayon = "0.7"
 selectors = { path = "../selectors" }
 serde = {version = "0.9", optional = true}
 serde_derive = {version = "0.9", optional = true}

components/style/gecko/global_style_data.rs

@@ -40,7 +40,7 @@ lazy_static! {
             None
         } else {
             let configuration =
-                rayon::Configuration::new().set_num_threads(num_threads);
+                rayon::Configuration::new().num_threads(num_threads);
             let pool = rayon::ThreadPool::new(configuration).ok();
             pool
         };

components/style/scoped_tls.rs

@@ -27,7 +27,7 @@ impl<'scope, T: Send> ScopedTLS<'scope, T> {
     /// Create a new scoped TLS that will last as long as this rayon threadpool
     /// reference.
     pub fn new(p: &'scope rayon::ThreadPool) -> Self {
-        let count = p.num_threads();
+        let count = p.current_num_threads();
         let mut v = Vec::with_capacity(count);
         for _ in 0..count {
             v.push(RefCell::new(None));