Use keyboard-types crate

Have embedders send DOM keys to servo and use a strongly typed KeyboardEvent
from the W3C UI Events spec. All keyboard handling now uses the new types.

Introduce a ShortcutMatcher to recognize key bindings. Shortcuts are now
recognized in a uniform way.

Updated the winit port.
Updated webdriver integration.

part of #20331

components/msg/constellation_msg.rs

@@ -10,153 +10,6 @@ use std::fmt;
 use std::num::NonZeroU32;
 use webrender_api;
 
-#[derive(Clone, Copy, Debug, Deserialize, Eq, PartialEq, Serialize)]
-pub enum KeyState {
-    Pressed,
-    Released,
-    Repeated,
-}
-
-//N.B. Based on the glutin key enum
-#[derive(Clone, Copy, Debug, Deserialize, Eq, MallocSizeOf, PartialEq, Serialize)]
-pub enum Key {
-    Space,
-    Apostrophe,
-    Comma,
-    Minus,
-    Period,
-    Slash,
-    Num0,
-    Num1,
-    Num2,
-    Num3,
-    Num4,
-    Num5,
-    Num6,
-    Num7,
-    Num8,
-    Num9,
-    Semicolon,
-    Equal,
-    A,
-    B,
-    C,
-    D,
-    E,
-    F,
-    G,
-    H,
-    I,
-    J,
-    K,
-    L,
-    M,
-    N,
-    O,
-    P,
-    Q,
-    R,
-    S,
-    T,
-    U,
-    V,
-    W,
-    X,
-    Y,
-    Z,
-    LeftBracket,
-    Backslash,
-    RightBracket,
-    GraveAccent,
-    World1,
-    World2,
-
-    Escape,
-    Enter,
-    Tab,
-    Backspace,
-    Insert,
-    Delete,
-    Right,
-    Left,
-    Down,
-    Up,
-    PageUp,
-    PageDown,
-    Home,
-    End,
-    CapsLock,
-    ScrollLock,
-    NumLock,
-    PrintScreen,
-    Pause,
-    F1,
-    F2,
-    F3,
-    F4,
-    F5,
-    F6,
-    F7,
-    F8,
-    F9,
-    F10,
-    F11,
-    F12,
-    F13,
-    F14,
-    F15,
-    F16,
-    F17,
-    F18,
-    F19,
-    F20,
-    F21,
-    F22,
-    F23,
-    F24,
-    F25,
-    Kp0,
-    Kp1,
-    Kp2,
-    Kp3,
-    Kp4,
-    Kp5,
-    Kp6,
-    Kp7,
-    Kp8,
-    Kp9,
-    KpDecimal,
-    KpDivide,
-    KpMultiply,
-    KpSubtract,
-    KpAdd,
-    KpEnter,
-    KpEqual,
-    LeftShift,
-    LeftControl,
-    LeftAlt,
-    LeftSuper,
-    RightShift,
-    RightControl,
-    RightAlt,
-    RightSuper,
-    Menu,
-
-    NavigateBackward,
-    NavigateForward,
-}
-
-bitflags! {
-    #[derive(Deserialize, Serialize)]
-    pub struct KeyModifiers: u8 {
-        const NONE = 0x00;
-        const SHIFT = 0x01;
-        const CONTROL = 0x02;
-        const ALT = 0x04;
-        const SUPER = 0x08;
-    }
-}
-
 #[derive(Clone, Copy, Debug, Deserialize, Eq, Hash, PartialEq, Serialize)]
 pub enum TraversalDirection {
     Forward(usize),