Adding Angular and dependent packages for testing

third_party/pkg/angular/lib/filter/uppercase.dart

Index: third_party/pkg/angular/lib/filter/uppercase.dart
diff --git a/third_party/pkg/angular/lib/filter/uppercase.dart b/third_party/pkg/angular/lib/filter/uppercase.dart
new file mode 100644
index 0000000000000000000000000000000000000000..6627fce31cffe0b2683a679e2a39b9e9013bc3fb
--- /dev/null
+++ b/third_party/pkg/angular/lib/filter/uppercase.dart
@@ -0,0 +1,13 @@
+part of angular.filter;
+
+/**
+ * Converts string to uppercase.
+ *
+ * Usage:
+ *
+ *     {{ uppercase_expression | uppercase }}
+ */
+@NgFilter(name:'uppercase')
+class UppercaseFilter {
+  call(String text) => text == null ? text : text.toUpperCase();
+}