Rationalize Dart mojo and sky package structure

sky/framework/theme/typography.dart

Index: sky/framework/theme/typography.dart
diff --git a/sky/framework/theme/typography.dart b/sky/framework/theme/typography.dart
deleted file mode 100644
index 28ecc845fe26ed46bc9e06c9982d76907631e245..0000000000000000000000000000000000000000
--- a/sky/framework/theme/typography.dart
+++ /dev/null
@@ -1,56 +0,0 @@
-// Copyright 2015 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-// See http://www.google.com/design/spec/style/typography.html
-
-const String _display4 = 'font-size: 112px; font-weight: 300';
-const String _display3 = 'font-size:  56px; font-weight: 400';
-const String _display2 = 'font-size:  45px; font-weight: 400';
-const String _display1 = 'font-size:  34px; font-weight: 400';
-const String _headline = 'font-size:  24px; font-weight: 400';
-const String _title    = 'font-size:  20px; font-weight: 500';
-const String _subhead  = 'font-size:  16px; font-weight: 400';
-const String _body2    = 'font-size:  14px; font-weight: 500';
-const String _body1    = 'font-size:  14px; font-weight: 400';
-const String _caption  = 'font-size:  12px; font-weight: 400';
-const String _button   = 'font-size:  14px; font-weight: 500';
-
-class _Black {
-  final String display4 = 'color: #757575; ${_display4}'; // 54%
-  final String display3 = 'color: #757575; ${_display3}'; // 54%
-  final String display2 = 'color: #757575; ${_display2}'; // 54%
-  final String display1 = 'color: #757575; ${_display1}'; // 54%
-  final String headline = 'color: #212121; ${_headline}'; // 87%
-  final String title    = 'color: #212121; ${_title}';    // 87%
-  final String subhead  = 'color: #212121; ${_subhead}';  // 87%
-  final String body2    = 'color: #212121; ${_body2}';    // 87%
-  final String body1    = 'color: #212121; ${_body1}';    // 87%
-  final String caption  = 'color: #757575; ${_caption}';  // 54%
-  final String button   = 'color: #212121; ${_button}';   // 87%
-
-  const _Black();
-}
-
-const _Black black = const _Black();
-
-class _White {
-  final String display4 = 'color: #8A8A8A; ${_display4}'; // 54%
-  final String display3 = 'color: #8A8A8A; ${_display3}'; // 54%
-  final String display2 = 'color: #8A8A8A; ${_display2}'; // 54%
-  final String display1 = 'color: #8A8A8A; ${_display1}'; // 54%
-  final String headline = 'color: #DEDEDE; ${_headline}'; // 87%
-  final String title    = 'color: #DEDEDE; ${_title}';    // 87%
-  final String subhead  = 'color: #DEDEDE; ${_subhead}';  // 87%
-  final String body2    = 'color: #DEDEDE; ${_body2}';    // 87%
-  final String body1    = 'color: #DEDEDE; ${_body1}';    // 87%
-  final String caption  = 'color: #8A8A8A; ${_caption}';  // 54%
-  final String button   = 'color: #DEDEDE; ${_button}';   // 87%
-
-  const _White();
-}
-
-const _White white = const _White();
-
-// TODO(abarth): Maybe this should be hard-coded in Scaffold?
-const String typeface = 'font-family: sans-serif';