pub transformer does not get access to pubspec.yaml as an asset

[DartBot]

<img src="https://avatars.githubusercontent.com/u/719048?v=3" align="left" width="96" height="96"hspace="10"> Issue by paulevans
Originally opened as dart-lang/sdk#21574

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What steps will reproduce the problem?

1. Write a transformer that attempts to use information in pubspec.yaml

What is the expected output? What do you see instead?
pubspec.yaml appears as asset
Actual:
pubspec.yaml never processed as asset

What version of the product are you using?
1.7.2

On what operating system?
Mac OS X

Please provide any additional information below.
Some metadata provided in the pubspec.yaml file (e.g. version. name, description) would be useful to some pub transformers

Work around:
On transformer construction current working directory is project root - so path can be constructed to pubspec.yaml at that point and read.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/405837?v=3" align="left" width="48" height="48"hspace="10"> Comment by zoechi

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Similar to http://dartbug.com/21020

[DartBot]

<img src="https://avatars.githubusercontent.com/u/2156198?v=3" align="left" width="48" height="48"hspace="10"> Comment by kasperl

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Added Area-Pub, Triaged labels.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/188?v=3" align="left" width="48" height="48"hspace="10"> Comment by nex3

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Added Duplicate label.
Marked as being merged into dart-archive/barback#53.