pkg/docgen: fixd build, ignore known static warnings

pkg/pkg.status

 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 # Don't run any test-like files that show up in packages directories. It
 # shouldn't be necessary to run "pub install" in these packages, but if you do
 # it shouldn't break the tests.
 */packages/*/*: Skip
 */*/packages/*/*: Skip
 */*/*/packages/*/*: Skip
@@ skipping 279 matching lines @@
 mutation_observer: Skip
 polymer_expressions/test/syntax_test: Skip
 polymer_expressions/test/globals_test: Skip
 polymer_expressions/test/bindings_test: Skip
 third_party/html5lib/test/browser/browser_test: Skip
 
 [ $runtime == safari || $runtime == ie9 || $runtime == ie10 ]
 polymer_expressions/test/globals_test: Fail # Issue 16568
 
 [ $runtime == safari || $runtime == chrome || $runtime == ie9 || $runtime == ff || $runtime == dartium || $runtime == drt ]
+docgen/test/generate_json_test: Skip  # Uses dart:io
 docgen/test/single_library_test: Skip # Uses dart:io
 docgen/test/multi_library_test: Skip # Uses dart:io
 scheduled_test/test/scheduled_server_test: Skip # Uses dart:io
 
 [ $browser || $runtime == vm ]
 unittest/test/missing_tick_test: Fail, OK # Expected to fail, due to timeout.
 
 
 [ $compiler == none && ($runtime == dartium || $runtime == drt) ]
 source_maps/test/parser_test: Pass, Timeout # Issue 13719: Please triage this failure.
 
 [ $compiler == dartanalyzer || $compiler == dart2analyzer ]
+docgen/test/generate_json_test: StaticWarning
 docgen/test/single_library_test: StaticWarning
 docgen/test/multi_library_test: StaticWarning
 unittest/test/matchers_test: StaticWarning, OK # testing error creating abstract class
 
 [ $runtime == vm && ($system == windows || $system == macos) ]
 watcher/test/*/linux_test: Skip
 
 [ $runtime == vm && ($system == windows || $system == linux) ]
 watcher/test/*/mac_os_test: Skip
 
@@ skipping 28 matching lines @@
 collection/test/priority_queue_test: PubGetError
 collection/test/unmodifiable_collection_test: PubGetError
 collection/test/wrapper_test: PubGetError
 stack_trace/test/chain_test: PubGetError
 stack_trace/test/frame_test: PubGetError
 stack_trace/test/trace_test: PubGetError
 stack_trace/test/vm_test: PubGetError
 
 [ $runtime == ie9 ]
 polymer: Pass, Fail, Timeout # Issue 16717