Fix for computing IS_CLIENT.

pkg/analyzer/test/src/context/context_test.dart

 // Copyright (c) 2014, 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.
 
 library test.src.context.context_test;
 
 import 'dart:async';
 import 'dart:collection';
 
 import 'package:analyzer/src/cancelable_future.dart';
@@ skipping 1925 matching lines @@
     expect(_context.getKindOf(source), same(SourceKind.UNKNOWN));
     _context.computeKindOf(source);
     expect(_context.getKindOf(source), same(SourceKind.PART));
   }
 
   void test_getKindOf_unknown() {
     Source source = _addSource("/test.css", "");
     expect(_context.getKindOf(source), same(SourceKind.UNKNOWN));
   }
 
-  void test_getLaunchableClientLibrarySources() {
+  void test_getLaunchableClientLibrarySources_doesNotImportHtml() {
+    _context = contextWithCore();
+    _sourceFactory = _context.sourceFactory;
+    Source source = _addSource("/test.dart", r'''
+main() {}''');
+    _context.computeLibraryElement(source);
+    List<Source> sources = _context.launchableClientLibrarySources;
+    expect(sources, isEmpty);
+  }
+
+  void test_getLaunchableClientLibrarySources_importsHtml_explicitly() {
     _context = contextWithCore();
     _sourceFactory = _context.sourceFactory;
     List<Source> sources = _context.launchableClientLibrarySources;
-    expect(sources, hasLength(0));
+    expect(sources, isEmpty);
     Source source = _addSource("/test.dart", r'''
 import 'dart:html';
 main() {}''');
     _context.computeLibraryElement(source);
     sources = _context.launchableClientLibrarySources;
-    expect(sources, hasLength(1));
+    expect(sources, unorderedEquals([source]));
+  }
+
+  void test_getLaunchableClientLibrarySources_importsHtml_implicitly() {
+    _context = contextWithCore();
+    _sourceFactory = _context.sourceFactory;
+    List<Source> sources = _context.launchableClientLibrarySources;
+    expect(sources, isEmpty);
+    _addSource("/a.dart", r'''
+import 'dart:html';
+''');
+    Source source = _addSource("/test.dart", r'''
+import 'a.dart';
+main() {}''');
+    _context.computeLibraryElement(source);
+    sources = _context.launchableClientLibrarySources;
+    expect(sources, unorderedEquals([source]));
+  }
+
+  void test_getLaunchableClientLibrarySources_importsHtml_implicitly2() {
+    _context = contextWithCore();
+    _sourceFactory = _context.sourceFactory;
+    List<Source> sources = _context.launchableClientLibrarySources;
+    expect(sources, isEmpty);
+    _addSource("/a.dart", r'''
+export 'dart:html';
+''');
+    Source source = _addSource("/test.dart", r'''
+import 'a.dart';
+main() {}''');
+    _context.computeLibraryElement(source);
+    sources = _context.launchableClientLibrarySources;
+    expect(sources, unorderedEquals([source]));
   }
 
   void test_getLaunchableServerLibrarySources() {
     _context = contextWithCore();
     _sourceFactory = _context.sourceFactory;
     List<Source> sources = _context.launchableServerLibrarySources;
     expect(sources, hasLength(0));
     Source source = _addSource("/test.dart", "main() {}");
     _context.computeLibraryElement(source);
     sources = _context.launchableServerLibrarySources;
@@ skipping 494 matching lines @@
       : super(name, UriKind.FILE_URI);
 
   @override
   TimestampedData<String> get contents {
     throw 'Read error';
   }
 
   @override
   bool exists() => true;
 }