chore(lint): Added license headers to most TypeScript files

Relates to #9380

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

@@ -1,3 +1,11 @@
+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
 import {Lexer, Token} from '@angular/compiler/src/expression_parser/lexer';
 import {ddescribe, describe, expect, it} from '@angular/core/testing';
 

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

@@ -1,3 +1,11 @@
+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
 import {AST, BindingPipe} from '@angular/compiler/src/expression_parser/ast';
 import {Lexer} from '@angular/compiler/src/expression_parser/lexer';
 import {Parser} from '@angular/compiler/src/expression_parser/parser';

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

@@ -1,3 +1,11 @@
+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
 import {AST, AstVisitor, Binary, BindingPipe, Chain, Conditional, EmptyExpr, FunctionCall, ImplicitReceiver, Interpolation, KeyedRead, KeyedWrite, LiteralArray, LiteralMap, LiteralPrimitive, MethodCall, PrefixNot, PropertyRead, PropertyWrite, Quote, SafeMethodCall, SafePropertyRead} from '../../src/expression_parser/ast';
 import {StringWrapper, isPresent, isString} from '../../src/facade/lang';
 import {DEFAULT_INTERPOLATION_CONFIG, InterpolationConfig} from '../../src/interpolation_config';