Add an optional parameter to the constructor of MouseWheelHandler to allow
handling the event in capture phase.

R=nicksantos
DELTA=4 (2 added, 0 deleted, 2 changed)


Revision created by MOE tool push_codebase.
MOE_MIGRATION=6125


git-svn-id: http://closure-library.googlecode.com/svn/trunk@2431 0b95b8e8-c90f-11de-9d4f-f947ee5921c8

Automated g4 rollback

*** Reason for rollback ***

breaks ff3.6 tests for unclear reasons

*** Original change description ***

Tweak the sourceUrl decision tree a bit, and update
the comments on when this should be used.

DELTA=35 (8 added, 18 deleted, 9 changed)


Revision created by MOE tool push_codebase.
MOE_MIGRATION=6126


git-svn-id: http://closure-library.googlecode.com/svn/trunk@2432 0b95b8e8-c90f-11de-9d4f-f947ee5921c8