Add early version of BrowserSystemFontLister

src/UglyToad.PdfPig.Fonts/SystemFonts/BrowserSystemFontLister.cs

@@ -0,0 +1,16 @@
+namespace UglyToad.PdfPig.Fonts.SystemFonts
+{
+#if NET
+    using System.Collections.Generic;
+
+    internal sealed class BrowserSystemFontLister : ISystemFontLister
+    {
+        // Very early version, intended to help developing support for browser
+
+        public IEnumerable<SystemFontRecord> GetAllFonts()
+        {
+            yield break;
+        }
+    }
+#endif
+}

src/UglyToad.PdfPig.Fonts/SystemFonts/SystemFontFinder.cs

@@ -92,7 +92,11 @@ static SystemFontFinder()
 #if NET
             else if (OperatingSystem.IsAndroid())
             {
-              lister = new AndroidSystemFontLister();
+                lister = new AndroidSystemFontLister();
+            }
+            else if (OperatingSystem.IsBrowser())
+            {
+                lister = new BrowserSystemFontLister();
             }
 #endif
             else

src/UglyToad.PdfPig.Fonts/SystemFonts/WindowsSystemFontLister.cs

@@ -8,8 +8,6 @@ internal sealed class WindowsSystemFontLister : ISystemFontLister
     {
         public IEnumerable<SystemFontRecord> GetAllFonts()
         {
-            // TODO: Could use System.Drawing InstalledFontCollection to do this?
-
             var winDir = Environment.GetFolderPath(Environment.SpecialFolder.Windows);
 
             var fonts = Path.Combine(winDir, "Fonts");