[dotnet] Add ability to disconnect a CDP session

Author: jimevans

dotnet/src/webdriver/Chromium/ChromiumDriver.cs

@@ -216,6 +216,15 @@ public DevToolsSession GetDevToolsSession(int devToolsProtocolVersion)
             return this.devToolsSession;
         }
 
+        public void TerminateDevToolsSession()
+        {
+            if (this.devToolsSession != null)
+            {
+                this.devToolsSession.Dispose();
+                this.devToolsSession = null;
+            }
+        }
+
         protected override void Dispose(bool disposing)
         {
             if (disposing)

dotnet/src/webdriver/DevTools/IDevTools.cs

@@ -35,5 +35,7 @@ public interface IDevTools
         /// <param name="protocolVersion">The specific version of the Developer Tools debugging protocol to use.</param>
         /// <returns>The active session to use to communicate with the Developer Tools debugging protocol.</returns>
         DevToolsSession GetDevToolsSession(int protocolVersion);
+
+        void TerminateDevToolsSession();
     }
 }

dotnet/src/webdriver/Firefox/FirefoxDriver.cs

@@ -300,6 +300,15 @@ public DevToolsSession GetDevToolsSession(int devToolsProtocolVersion)
             return this.devToolsSession;
         }
 
+        public void TerminateDevToolsSession()
+        {
+            if (this.devToolsSession != null)
+            {
+                this.devToolsSession.Dispose();
+                this.devToolsSession = null;
+            }
+        }
+
         /// <summary>
         /// In derived classes, the <see cref="PrepareEnvironment"/> method prepares the environment for test execution.
         /// </summary>

dotnet/src/webdriver/Remote/RemoteWebDriver.cs

@@ -444,6 +444,15 @@ public DevToolsSession GetDevToolsSession(int protocolVersion)
             return this.devToolsSession;
         }
 
+        public void TerminateDevToolsSession()
+        {
+            if (this.devToolsSession != null)
+            {
+                this.devToolsSession.Dispose();
+                this.devToolsSession = null;
+            }
+        }
+
         private static ICapabilities ConvertOptionsToCapabilities(DriverOptions options)
         {
             if (options == null)