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

pkg/front_end/lib/src/fasta/scanner.dart

Index: pkg/front_end/lib/src/fasta/scanner.dart
diff --git a/pkg/front_end/lib/src/fasta/scanner.dart b/pkg/front_end/lib/src/fasta/scanner.dart
index cf5be615fe7f064570c16b006a3917bef80893e9..bc9550812b5bfcabfb4959c1e0299266fd423806 100644
--- a/pkg/front_end/lib/src/fasta/scanner.dart
+++ b/pkg/front_end/lib/src/fasta/scanner.dart
@@ -62,22 +62,28 @@ class ScannerResult {
 /// Scan/tokenize the given UTF8 [bytes].
 /// If [recover] is null, then the [defaultRecoveryStrategy] is used.
 ScannerResult scan(List<int> bytes,
-    {bool includeComments: false, Recover recover}) {
+    {bool includeComments: false,
+    bool scanGenericMethodComments: false,
+    Recover recover}) {
   if (bytes.last != 0) {
     throw new ArgumentError("[bytes]: the last byte must be null.");
   }
-  Scanner scanner =
-      new Utf8BytesScanner(bytes, includeComments: includeComments);
+  Scanner scanner = new Utf8BytesScanner(bytes,
+      includeComments: includeComments,
+      scanGenericMethodComments: scanGenericMethodComments);
   return _tokenizeAndRecover(scanner, recover, bytes: bytes);
 }
 
 /// Scan/tokenize the given [source].
 /// If [recover] is null, then the [defaultRecoveryStrategy] is used.
 ScannerResult scanString(String source,
-    {bool includeComments: false, Recover recover}) {
+    {bool includeComments: false,
+    bool scanGenericMethodComments: false,
+    Recover recover}) {
   assert(source != null, 'source must not be null');
-  StringScanner scanner =
-      new StringScanner(source, includeComments: includeComments);
+  StringScanner scanner = new StringScanner(source,
+      includeComments: includeComments,
+      scanGenericMethodComments: scanGenericMethodComments);
   return _tokenizeAndRecover(scanner, recover, source: source);
 }