feat(ExpressionParser): add support for this

modules/@angular/compiler/test/expression_parser/lexer_spec.ts

@@ -67,6 +67,12 @@ export function main() {
         expectIdentifierToken(tokens[0], 0, 'j');
       });
 
+      it('should tokenize "this"', () => {
+        var tokens: number[] = lex('this');
+        expect(tokens.length).toEqual(1);
+        expectKeywordToken(tokens[0], 0, 'this');
+      });
+
       it('should tokenize a dotted identifier', () => {
         var tokens: number[] = lex('j.k');
         expect(tokens.length).toEqual(3);

modules/@angular/compiler/test/expression_parser/parser_spec.ts

@@ -163,6 +163,7 @@ export function main() {
       describe('member access', () => {
         it('should parse field access', () => {
           checkAction('a');
+          checkAction('this.a', 'a');
           checkAction('a.a');
         });