Replace isAppropriateFor with suitabilityFor and start using it

pkg/analyzer/lib/src/task/html.dart

Index: pkg/analyzer/lib/src/task/html.dart
diff --git a/pkg/analyzer/lib/src/task/html.dart b/pkg/analyzer/lib/src/task/html.dart
index b6a771a8651c8229efa0892d1b4580f53fceeeb5..01cdd5a5c45815131be6cf52cbe67d0d06e36033 100644
--- a/pkg/analyzer/lib/src/task/html.dart
+++ b/pkg/analyzer/lib/src/task/html.dart
@@ -279,7 +279,8 @@ class ParseHtmlTask extends SourceBasedAnalysisTask {
       'ParseHtmlTask',
       createTask,
       buildInputs,
-      <ResultDescriptor>[HTML_DOCUMENT, HTML_DOCUMENT_ERRORS, LINE_INFO]);
+      <ResultDescriptor>[HTML_DOCUMENT, HTML_DOCUMENT_ERRORS, LINE_INFO],
+      suitabilityFor: suitabilityFor);
 
   /**
    * Initialize a newly created task to access the content of the source
@@ -358,6 +359,20 @@ class ParseHtmlTask extends SourceBasedAnalysisTask {
   }
 
   /**
+   * Return an indication of how suitable this task is for the given [target].
+   */
+  static TaskSuitability suitabilityFor(AnalysisTarget target) {
+    if (target is Source) {
+      String name = target.shortName;
+      if (name.endsWith(AnalysisEngine.SUFFIX_HTML) ||
+          name.endsWith(AnalysisEngine.SUFFIX_HTM)) {
+        return TaskSuitability.HIGHEST;
+      }
+    }
+    return TaskSuitability.NONE;
+  }
+
+  /**
    * Compute [LineInfo] for the given [content].
    */
   static LineInfo _computeLineInfo(String content) {