Make default text size configurable in Settings

wgpu/src/settings.rs

@@ -16,6 +16,11 @@ pub struct Settings {
     /// If `None` is provided, a default system font will be chosen.
     pub default_font: Option<&'static [u8]>,
 
+    /// The default size of text.
+    ///
+    /// By default, it will be set to 20.
+    pub default_text_size: u16,
+
     /// The antialiasing strategy that will be used for triangle primitives.
     pub antialiasing: Option<Antialiasing>,
 }
@@ -25,6 +30,7 @@ impl Default for Settings {
         Settings {
             format: wgpu::TextureFormat::Bgra8UnormSrgb,
             default_font: None,
+            default_text_size: 20,
             antialiasing: None,
         }
     }