Split servoshell into Desktop and common part (#32457)

* servoshell: Move desktop files

Move files related to winit into a desktop module.
This is a preparation to merge the android and ohos apps into
servoshell.

* servoshell: Format imports

* servoshell: Move panic hook into separate file

* servoshell: Move desktop main

* Consider ohos as not desktop

* servoshell: Adjust dependencies for shared code

* servoshell: Remove native-bluetooth from default features

There currently is no good way to have target specific default features.

* Rename desktop_main.rs to cli.rs

* Remove todo

ports/servoshell/desktop/cli.rs

@@ -0,0 +1,104 @@
+/* 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 https://mozilla.org/MPL/2.0/. */
+
+use std::{env, panic, process};
+
+use getopts::Options;
+use log::error;
+use servo::config::opts::{self, ArgumentParsingResult};
+use servo::servo_config::pref;
+
+use crate::desktop::app::App;
+use crate::panic_hook;
+
+pub fn main() {
+    crate::crash_handler::install();
+
+    crate::resources::init();
+
+    // Parse the command line options and store them globally
+    let args: Vec<String> = env::args().collect();
+    let mut opts = Options::new();
+    opts.optflag(
+        "",
+        "clean-shutdown",
+        "Do not shutdown until all threads have finished (macos only)",
+    );
+    opts.optflag("b", "no-native-titlebar", "Do not use native titlebar");
+    opts.optopt("", "device-pixel-ratio", "Device pixels per px", "");
+    opts.optopt(
+        "u",
+        "user-agent",
+        "Set custom user agent string (or ios / android / desktop for platform default)",
+        "NCSA Mosaic/1.0 (X11;SunOS 4.1.4 sun4m)",
+    );
+    opts.optmulti(
+        "",
+        "pref",
+        "A preference to set to enable",
+        "dom.bluetooth.enabled",
+    );
+    opts.optmulti(
+        "",
+        "pref",
+        "A preference to set to disable",
+        "dom.webgpu.enabled=false",
+    );
+
+    let opts_matches;
+    let content_process_token;
+
+    match opts::from_cmdline_args(opts, &args) {
+        ArgumentParsingResult::ContentProcess(matches, token) => {
+            opts_matches = matches;
+            content_process_token = Some(token);
+        },
+        ArgumentParsingResult::ChromeProcess(matches) => {
+            opts_matches = matches;
+            content_process_token = None;
+        },
+    };
+
+    crate::prefs::register_user_prefs(&opts_matches);
+
+    // TODO: once log-panics is released, can this be replaced by
+    // log_panics::init()?
+    panic::set_hook(Box::new(panic_hook::panic_hook));
+
+    if let Some(token) = content_process_token {
+        return servo::run_content_process(token);
+    }
+
+    if opts::get().is_printing_version {
+        println!("{}", crate::servo_version());
+        process::exit(0);
+    }
+
+    let clean_shutdown = opts_matches.opt_present("clean-shutdown");
+    let do_not_use_native_titlebar =
+        opts_matches.opt_present("no-native-titlebar") || !(pref!(shell.native_titlebar.enabled));
+    let device_pixel_ratio_override = opts_matches.opt_str("device-pixel-ratio").map(|dppx_str| {
+        dppx_str.parse().unwrap_or_else(|err| {
+            error!("Error parsing option: --device-pixel-ratio ({})", err);
+            process::exit(1);
+        })
+    });
+
+    let user_agent = opts_matches.opt_str("u");
+
+    let url_opt = if !opts_matches.free.is_empty() {
+        Some(&opts_matches.free[0][..])
+    } else {
+        None
+    };
+
+    App::run(
+        do_not_use_native_titlebar,
+        device_pixel_ratio_override,
+        user_agent,
+        url_opt.map(|s| s.to_string()),
+    );
+
+    crate::platform::deinit(clean_shutdown)
+}