introduce web_components pkg for consolidated polyfills

pkg/polymer/CHANGELOG.md

Index: pkg/polymer/CHANGELOG.md
diff --git a/pkg/polymer/CHANGELOG.md b/pkg/polymer/CHANGELOG.md
index d732a8884cec3f1928fef07f52029ffd624442be..c53ea4cc483efb12d875edb18b62b3c6ac648400 100644
--- a/pkg/polymer/CHANGELOG.md
+++ b/pkg/polymer/CHANGELOG.md
@@ -6,6 +6,12 @@ impact polymer: custom_element, html_import, observe, shadow_dom,
 and template_binding.
 
 #### Pub version 0.10.0-dev

[Siggi Cherem (dart-lang), 2014/02/10 20:49:23]

maybe mention the fix for link-rel-stylesheet that now will load things with
HTTP.get until we fix it propertly?

[Jennifer Messerly, 2014/02/10 22:17:11]

my memory on this is already fuzzy :) But I don't think it is actually different
then the previous behavior. The reason a code change was necessary is that
HTMLImports is provided by platform.js, whereas previously we never used it. So
we started going down a code path that was dead code before now. My "fix" sends
us back down the working-but-slow code path.

+  * Polymer polyfills are now consolidated in package:web_components, which is
+    identical to platform.js from http://polymer-project.org. This enables
+    interop with elements built in polymer.js.
+  * New feature: `@ObserveProperty('foo bar.baz') myMethod() {...}` will cause

[Jennifer Messerly, 2014/02/08 01:13:29]

forgot to document these last change.

+    myMethod to be called when "foo" or "bar.baz" changes.
+  * Updated for 0.10.0-dev package:observe and package:template_binding changes.
   * Deploy step removes use of mirrors to initialize polymer elements. Mirrors
     are still used for @published and for polymer-expressions.
     **breaking change**: @initMethod and @CustomTag are only supported on