style: Split stylesheets.rs

This file has become quite bloated lately. This commit deletes that file in
favor of a set of submodules.

The only noticeable change apart from code move, is converting deep_clone_foo
methods into a trait.

It also unifies logic related to different style rules in the same place.

There's some missing work, specially related to font-face and counter-style, but
I think this is worth landing in the meantime.

1 files changed, 2 insertions, 3 deletions

diff --git a/components/script/dom/bindings/trace.rs b/components/script/dom/bindings/trace.rs
index 64ef88da5e3..db3cd3b5c42 100644
--- a/components/script/dom/bindings/trace.rs
+++ b/components/script/dom/bindings/trace.rs
@@ -95,16 +95,15 @@ use std::time::{SystemTime, Instant};
 use style::attr::{AttrIdentifier, AttrValue, LengthOrPercentageOrAuto};
 use style::context::QuirksMode;
 use style::element_state::*;
-use style::keyframes::Keyframe;
 use style::media_queries::MediaList;
 use style::properties::PropertyDeclarationBlock;
 use style::selector_parser::{PseudoElement, Snapshot};
 use style::shared_lock::{SharedRwLock as StyleSharedRwLock, Locked as StyleLocked};
 use style::stylearc::Arc as StyleArc;
 use style::stylesheets::{CssRules, FontFaceRule, KeyframesRule, MediaRule};
-use style::stylesheets::{NamespaceRule, StyleRule, ImportRule, SupportsRule};
+use style::stylesheets::{NamespaceRule, StyleRule, ImportRule, SupportsRule, ViewportRule};
+use style::stylesheets::keyframes_rule::Keyframe;
 use style::values::specified::Length;
-use style::viewport::ViewportRule;
 use time::Duration;
 use uuid::Uuid;
 use webrender_traits::{WebGLBufferId, WebGLError, WebGLFramebufferId, WebGLProgramId};