[gwt-contrib] Improve canvas for browsers (and permutations) with partial canvas support. (issue1296801)

[pdr]

Reviewers: jlabanca, rice,

Description:
Improve canvas for browsers (and permutations) with partial canvas
support.

Please review this at http://gwt-code-reviews.appspot.com/1296801/show

Affected files:
  M user/src/com/google/gwt/canvas/client/Canvas.java
  M user/src/com/google/gwt/canvas/dom/DOM.gwt.xml
  A  
user/src/com/google/gwt/canvas/dom/client/CanvasElementSupportDetectedMaybe.java
  A  
user/src/com/google/gwt/canvas/dom/client/CanvasElementSupportDetectedNo.java
  A  
user/src/com/google/gwt/canvas/dom/client/CanvasElementSupportDetector.java
  M user/test/com/google/gwt/canvas/client/CanvasTest.java
  M user/test/com/google/gwt/canvas/dom/client/Context2dTest.java


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