[Fuchsia] Flag changes in Fuchsia gpu integration tests.

Make fuchsia-ssh-port flag optional.
Pass on ssh config file directly to gpu tests

Bug: 1133039
Change-Id: Iefdf83760965d140463d14d7c083d3d2276c6411
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2436519
Commit-Queue: Chong Gu <chonggu@google.com>
Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813152}

content/test/gpu/run_gpu_integration_test_fuchsia.py

@@ -56,8 +56,10 @@ def main():
     with GetDeploymentTargetForArgs(additional_target_args) as target:
       target.Start()
       _, fuchsia_ssh_port = target._GetEndpoint()
-      gpu_script.extend(['--fuchsia-ssh-config-dir', args.out_dir])
-      gpu_script.extend(['--fuchsia-ssh-port', str(fuchsia_ssh_port)])
+      gpu_script.extend(['--chromium-output-directory', args.out_dir])
+      gpu_script.extend(['--fuchsia-ssh-config', target._GetSshConfigPath()])
+      if fuchsia_ssh_port:
+        gpu_script.extend(['--fuchsia-ssh-port', str(fuchsia_ssh_port)])
       gpu_script.extend(['--fuchsia-system-log-file', args.system_log_file])
       if args.verbose:
         gpu_script.append('-v')