Support Chrome Web Driver for mac/linux (#38)

* Support Chrome Web Drivers for mac/linux
* Update ChromeConfig.cs
* Make the binary executable on linux/osx

Author: timotei

WebDriverManager/DriverConfigs/Impl/ChromeConfig.cs

@@ -1,29 +1,50 @@
 using System;
 using System.IO;
 using System.Net;
+using System.Runtime.InteropServices;
+using WebDriverManager.DriverConfigs;
 
 namespace WebDriverManager.DriverConfigs.Impl
 {
     public class ChromeConfig : IDriverConfig
     {
+        private const string BaseVersionPatternUrl = "https://chromedriver.storage.googleapis.com/<version>/";
+
         public virtual string GetName()
         {
             return "Chrome";
         }
 
         public virtual string GetUrl32()
         {
-            return "https://chromedriver.storage.googleapis.com/<version>/chromedriver_win32.zip";
+            return GetUrl();
         }
 
         public virtual string GetUrl64()
         {
-            return GetUrl32();
+            return GetUrl();
+        }
+
+        private string GetUrl()
+        {
+            if (RuntimeInformation.IsOSPlatform(OSPlatform.OSX))
+            {
+                return $"{BaseVersionPatternUrl}chromedriver_mac64.zip";
+            }
+
+            if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux))
+            {
+                return $"{BaseVersionPatternUrl}chromedriver_linux64.zip";
+            }
+
+            return $"{BaseVersionPatternUrl}chromedriver_win32.zip";
         }
 
         public virtual string GetBinaryName()
         {
-            return "chromedriver.exe";
+            var isWindows = RuntimeInformation.IsOSPlatform(OSPlatform.Windows);
+            var suffix = isWindows ? ".exe" : string.Empty;
+            return $"chromedriver{suffix}";
         }
 
         public virtual string GetLatestVersion()

WebDriverManager/Services/Impl/BinaryService.cs

@@ -1,7 +1,9 @@
 using System;
+using System.Diagnostics;
 using System.IO;
 using System.IO.Compression;
 using System.Net;
+using System.Runtime.InteropServices;
 using WebDriverManager.Helpers;
 
 namespace WebDriverManager.Services.Impl
@@ -20,6 +22,13 @@ public string SetupBinary(string url, string zipDestination, string binDestinati
             {
                 binDestination = UnZip(zipDestination, binDestination, binaryName);
             }
+            
+            if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux) ||
+                RuntimeInformation.IsOSPlatform(OSPlatform.OSX))
+            {
+                var chmod = Process.Start("chmod", $"+x {binDestination}");
+                chmod.WaitForExit();
+            }
 
             RemoveZip(zipDestination);
             return binDestination;