Add 'scanGenericMethodComments' parameter to constructors and scan() functions.

pkg/analyzer/lib/src/dart/analysis/file_state.dart

Index: pkg/analyzer/lib/src/dart/analysis/file_state.dart
diff --git a/pkg/analyzer/lib/src/dart/analysis/file_state.dart b/pkg/analyzer/lib/src/dart/analysis/file_state.dart
index 44100e268ddd5eb1d4a7d8ef0bbcb1e7eb0a551c..32adf127900b7f0200707f0cb742bd3419b9ebef 100644
--- a/pkg/analyzer/lib/src/dart/analysis/file_state.dart
+++ b/pkg/analyzer/lib/src/dart/analysis/file_state.dart
@@ -380,8 +380,9 @@ class FileState {
 
     if (USE_FASTA_PARSER) {
       try {
-        fasta.ScannerResult scanResult =
-            fasta.scan(_contentBytes, includeComments: true);
+        fasta.ScannerResult scanResult = fasta.scan(_contentBytes,
+            includeComments: true,
+            scanGenericMethodComments: analysisOptions.strongMode);
 
         var astBuilder = new fasta.AstBuilder(
             new ErrorReporter(errorListener, source),
@@ -390,6 +391,8 @@ class FileState {
             new _FastaElementStoreProxy(),
             new fasta.Scope.top(isModifiable: true),
             uri);
+        astBuilder.parseGenericMethodComments = analysisOptions.strongMode;
+
         var parser = new fasta.Parser(astBuilder);
         astBuilder.parser = parser;
         parser.parseUnit(scanResult.tokens);