fix(generator): Write URI in sorted order to prevent SHA churn

Author: mhevery

lib/tools/template_cache_generator.dart

@@ -89,7 +89,8 @@ printTemplateCache(Map<String, String> templateKeyMap,
   outSink.write(fileHeader(outputLibrary));
 
   List<Future> reads = <Future>[];
-  templateKeyMap.forEach((uri, templateFile) {
+  templateKeyMap.keys.toList()..sort()..forEach((uri) {
+    var templateFile = templateKeyMap[uri];
     reads.add(new File(templateFile).readAsString().then((fileStr) {
       fileStr = fileStr.replaceAll('"""', r'\"\"\"');
       String resultUri = uri;

test/io/template_cache_generator_spec.dart

@@ -59,8 +59,8 @@ main() => describe('template_cache_generator', () {
       '\n'
       'primeTemplateCache(TemplateCache tc) {\n'
       'tc.put("rewritten/cssUrls/one.css", new HttpResponse(200, r"""body {}"""));\n'
-      'tc.put("rewritten/cssUrls/two.css", new HttpResponse(200, r"""body {}"""));\n'
       'tc.put("rewritten/cssUrls/three.css", new HttpResponse(200, r"""body {}"""));\n'
+      'tc.put("rewritten/cssUrls/two.css", new HttpResponse(200, r"""body {}"""));\n'
       '}');
     }).whenComplete(() {
       //tmpDir.deleteSync(recursive: true);