Update BoxDecoration and RenderParagraph to use sky.Color instead of int.

sky/engine/core/painting/Color.dart

Index: sky/engine/core/painting/Color.dart
diff --git a/sky/engine/core/painting/Color.dart b/sky/engine/core/painting/Color.dart
index b88e3b45619e84bac46be5ead6773ac2e3a20fcc..d487d0a444a3efa3a3db6b178b7a11bace94bf7a 100644
--- a/sky/engine/core/painting/Color.dart
+++ b/sky/engine/core/painting/Color.dart
@@ -8,6 +8,12 @@ class Color {
   final int _value;
   int get value => _value;
 
+  static const Color black = const Color(0xFF000000);

[eseidel, 2015/06/03 19:32:20]

I wouldn't build these into colors, but rather on top of them.  Have a separate
named_colors.dart if you like.  Or just use the themes/colors.dart (which exists
already) for now.

[Matt Perry, 2015/06/03 20:17:01]

Done.

+  static const Color white = const Color(0xFFFFFFFF);
+  static const Color red = const Color(0xFFFF0000);
+  static const Color green = const Color(0xFF00FF00);
+  static const Color blue = const Color(0xFF0000FF);

[Hixie, 2015/06/03 19:35:10]

I don't think we should name colours.
It's ok if the framework has palettes, but the core platform shouldn't deal in
names. Once we go down that path, there's no end to it.

[Matt Perry, 2015/06/03 20:17:01]

Done.

+
   const Color(this._value);
   const Color.fromARGB(int a, int r, int g, int b) :
     _value = (((a & 0xff) << 24) |
@@ -15,4 +21,12 @@ class Color {
               ((g & 0xff) << 8) |
               ((b & 0xff) << 0));
 
+  bool operator ==(other) {
+    if (!(other is Color)) return false;
+    return _value == other._value;
+  }

[Hixie, 2015/06/03 19:35:11]

bool operator == (other) => other is Color && _value == other._value;

[Matt Perry, 2015/06/03 20:17:01]

Done.

+  int get hashCode {
+    return _value.hashCode;
+  }

[Hixie, 2015/06/03 19:35:11]

int get hashCode => _value.hashCode;

[Matt Perry, 2015/06/03 20:17:01]

Done.

+  String toString() => "Color($_value)";

[kulakowski, 2015/06/03 19:29:52]

"Color(0x${_value.toRadixString(16)})"

might be nicer. Though this will print e.g. 0xff and not 0x000000ff. There is
https://github.com/dart-lang/intl is you want the latter.

[Hixie, 2015/06/03 19:35:11]

String toString() => "Color(0x${_value.toRadixString(16).padLeft(8, '0')})";

(and then replace the equivalent code in tests/resources/display_list.dart)

[Matt Perry, 2015/06/03 20:17:01]

Awesome, thanks. Done.

Are you OK with the Paint.toString displaying Paint(Color(0x00F00BA4)) ?

 }