ElementAttributeMap.[]= fails in Dartium build on SVGElement sample

[DartBot]

This issue was originally filed by @financecoding

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What steps will reproduce the problem?

1. git clone git://gist.github.com/1925967.git gist-1925967
2. (optional to build .js file) edit buildit.sh, point to local sdk frogc, ./buildit.sh
3. open Dartium SVGSamples.html

What is the expected output? What do you see instead?
Expected to see bars on the x and y axis http://goo.gl/SfIKj .
Dartium throws this error:

Exception: String expected
Stack Trace: 0. Function: 'ElementImplementation._setAttribute@1c3f8015' url: '/b/build/slave/dartium-mac-inc/build/src/xcodebuild/DerivedSources/Release/webkit/bindings/dart/generated/dart/ElementImplementation.dart' line:219 col:3
 1. Function: 'ElementImplementation.setAttribute' url: '/b/build/slave/dartium-mac-inc/build/src/xcodebuild/DerivedSources/Release/webkit/bindings/dart/generated/dart/ElementImplementation.dart' line:213 col:18
 2. Function: 'ElementAttributeMap.[]=' url: 'dart:htmlimpl' line:22509 col:26
 3. Function: 'ElementWrappingImplementation.set:attributes' url: 'dart:htmlimpl' line:22771 col:17
 4. Function: 'SVGSamples.drawlines' url: 'file:///tmp/gist-1925967/SVGSamples.dart' line:19 col:24
 5. Function: 'SVGSamples.run' url: 'file:///tmp/gist-1925967/SVGSamples.dart' line:6 col:14
 6. Function: '::main' url: 'file:///tmp/gist-1925967/SVGSamples.dart' line:54 col:23

What version of the product are you using? On what operating system?

Chromium 19.0.1050.0 (Developer Build 123195)
OS Mac OS X
WebKit 535.22 (Source/WebCore/Configurations@189)
JavaScript V8 3.9.8
DartVM r4589
Flash 11.1.102.55
User Agent Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_3) AppleWebKit/535.22 (KHTML, like Gecko) Chrome/19.0.1050.0 (Dart) Safari/535.22
Command Line /Users/adam/Documents/DartEditor/dart/Chromium.app/Contents/MacOS/Chromium -psn_0_5817740 --flag-switches-begin --flag-switches-end
Executable Path /Users/adam/Documents/DartEditor/dart/Chromium.app/Contents/MacOS/Chromium
Profile Path /Users/adam/Library/Application Support/Chromium/Default

10:29:41-adam@Adams-MacBook-Air:/tmp/gist-1925967
$ uname -a
Darwin Adams-MacBook-Air.local 11.3.0 Darwin Kernel Version 11.3.0: Thu Jan 12 18:47:41 PST 2012; root:xnu-1699.24.23~1/RELEASE_X86_64 x86_64

DartEditor and Dartium downloaded on Feb 26, from the CI servers
wget http://gsdview.appspot.com/dart-editor-archive-continuous/latest/DartBuild-macosx.cocoa.x86_64.zip
wget http://commondatastorage.googleapis.com/dartium-archive/continuous/dartium-mac.zip

Please provide any additional information below.
The gist includes the generated .js file as reference.

[DartBot]

This comment was originally written by antonm@google.com

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Set owner to antonm@google.com.
Added Area-Dartium, Triaged labels.

[DartBot]

This comment was originally written by antonm@google.com

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This is due missing number to string conversion: Element.setAttribute accepts only Strings as a name and a value. I believe this should be fixed either in dart:html or in the code itself. I'd vote for dart:html fix.

Jacob, wdyt?

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Set owner to @jacob314.

[jacob314]

Patch under review. Was able to implement this in Frog without degrading performance more than 1%.
https://chromiumcodereview.appspot.com/9930008

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Added Started label.

[jacob314]

Added Fixed label.