Roll Observatory packages and add a roll script

packages/dart_style/test/comments/lists.stmt

Index: packages/dart_style/test/comments/lists.stmt
diff --git a/packages/dart_style/test/comments/lists.stmt b/packages/dart_style/test/comments/lists.stmt
new file mode 100644
index 0000000000000000000000000000000000000000..0f7aa042d98dec4ef05a16bb31b8c8a6888e2be2
--- /dev/null
+++ b/packages/dart_style/test/comments/lists.stmt
@@ -0,0 +1,102 @@
+40 columns                              |
+>>> indented line comment (dartbug.com/16383)
+var list = [
+  // comment
+];
+<<<
+var list = [
+  // comment
+];
+>>> line comment on opening line
+var list = [ // comment
+];
+<<<
+var list = [
+  // comment
+];
+>>> indented block comment
+var list = [
+  /* comment */
+];
+<<<
+var list = [
+  /* comment */
+];
+>>> block comment with trailing newline
+var list = [/* comment */
+];
+<<<
+var list = [
+  /* comment */
+];
+>>> block comment with leading newline
+var list = [
+  /* comment */];
+<<<
+var list = [
+  /* comment */
+];
+>>> inline block comment
+var list = [  /* comment */  ];
+<<<
+var list = [/* comment */];
+>>> multiple comments on opening line
+var list = [ /* first */ // second
+];
+<<<
+var list = [
+  /* first */ // second
+];
+>>> multiple inline block comments
+var list = [  /* 1 */   /* 2 */   /* 3 */  ];
+<<<
+var list = [/* 1 */ /* 2 */ /* 3 */];
+>>> multiline trailing block comment
+var list = [  /* comment
+*/  ];
+<<<
+var list = [
+  /* comment
+*/
+];
+>>> line comment between items
+var list = ['a', // comment
+  'b'];
+<<<
+var list = [
+  'a', // comment
+  'b'
+];
+>>> line comments after last item
+var list = ['a' // 1
+  // 2
+];
+<<<
+var list = [
+  'a' // 1
+  // 2
+];
+>>> line comments after trailing comma
+var list = ['a', // 1
+  // 2
+];
+<<<
+var list = [
+  'a', // 1
+  // 2
+];
+>>> space on left between block comment and ","
+var list = [1,/* a */ 2 /* b */  , 3];
+<<<
+var list = [1, /* a */ 2 /* b */, 3];
+>>> remove blank line before beginning of body
+var list = [
+
+
+
+  // comment
+];
+<<<
+var list = [
+  // comment
+];