Fix issue where non-resource attributes would cause obtainStyleAttributes to fail

A sentinal value of 0x00000000 was used to mark the first time an AttributeFinder
was used. If the resource ID of an attribute was also 0x00000000 (which occurs with
non-resource attributes, like 'style'), then it would be mistaken as the sentinel
start value.

Bug:18421787
Change-Id: I4be353e0f8c940cb6f262d155129f048dcc444ae