Refactor emitter in web-ui to make dart.js the last script, also cleanup tests

example/component/news/test/expected/news_index_test.html.txt

Index: example/component/news/test/expected/news_index_test.html.txt
diff --git a/example/component/news/test/expected/news_index_test.html.txt b/example/component/news/test/expected/news_index_test.html.txt
index f336a1c529225114d50c4eb49b9a7e3437794967..711fb8de54723fe764edd053553a75ae9f50d8c4 100644
--- a/example/component/news/test/expected/news_index_test.html.txt
+++ b/example/component/news/test/expected/news_index_test.html.txt
@@ -2,17 +2,17 @@ Content-Type: text/plain
 layer at (0,0) size 800x600
   RenderView at (0,0) size 800x600
 layer at (0,0) size 800x264
-  RenderBlock {HTML} at (0,0) size 800x264
-    RenderBody {BODY} at (8,10) size 784x238
+  RenderBlock {HTML} at (0,0) size 800x263.78

[Jennifer Messerly, 2013/08/14 02:15:55]

wow, subpixel layout by default?

[Siggi Cherem (dart-lang), 2013/08/14 17:31:49]

I know, it's really weird. Someone it doesn't always do this for me. For
example, in the polymer branch the bots seem to use this precision, but my
machine doesn't :-/ ?

+    RenderBody {BODY} at (8,10.72) size 784x237.06
       RenderBlock {H1} at (0,0) size 784x18
         RenderText {#text} at (0,0) size 290x18
           text run at (0,0) width 290: "Simple Web Components Example"
-      RenderBlock {UL} at (0,34) size 784x204
-        RenderBlock {DIV} at (40,0) size 744x83 [color=#FF0000] [border: (1px dashed #800080)]
-          RenderBlock {H2} at (1,14) size 742x19
+      RenderBlock {UL} at (0,34) size 784x203.06
+        RenderBlock {DIV} at (40,0) size 744x82.53 [color=#FF0000] [border: (1px dashed #800080)]
+          RenderBlock {H2} at (1,14.27) size 742x18
             RenderText {#text} at (0,0) size 160x18
               text run at (0,0) width 160: "Breaking Stories"
-          RenderBlock {UL} at (1,45) size 742x37
+          RenderBlock {UL} at (1,45.53) size 742x36
             RenderListItem {LI} at (40,0) size 702x18
               RenderListMarker at (-17,0) size 7x18: white bullet
               RenderInline {A} at (0,0) size 120x18 [color=#0000EE]
@@ -23,11 +23,11 @@ layer at (0,0) size 800x264
               RenderInline {A} at (0,0) size 140x18 [color=#0000EE]
                 RenderText {#text} at (0,0) size 140x18
                   text run at (0,0) width 140: "Horrible story"
-        RenderBlock {DIV} at (40,82) size 744x122 [border: (1px solid #00FFFF)]
-          RenderBlock {H2} at (1,16) size 742x19
+        RenderBlock {DIV} at (40,82.53) size 744x120.53 [border: (1px solid #00FFFF)]
+          RenderBlock {H2} at (1,16.27) size 742x18
             RenderText {#text} at (0,0) size 100x18
               text run at (0,0) width 100: "Other News"
-          RenderBlock {UL} at (1,47) size 742x73
+          RenderBlock {UL} at (1,47.53) size 742x72
             RenderListItem {LI} at (40,0) size 702x18
               RenderListMarker at (-17,0) size 7x18: white bullet
               RenderInline {A} at (0,0) size 70x18 [color=#0000EE]