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Fix #556, make focus navigation work when shadow host's tabindex is -1 #557

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Fix #556, make focus navigation work when shadow host's tabindex is -1 #557

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Commits on Aug 29, 2016

  1. Fix WICG#556, make focus navigation work when shadow host's tabindex … 

    …is -1

The Shadow DOM spec section 6.3 (sequential focus navigation)
unintentionally excluded all shadow hosts with nagative tabindex in Step
3.1.3. This was unexpected for shadow hosts with `delagatesFocus=false`
shadow root.

Before:
 - Exclude all shadow hosts with tabindex < 0

After:
 - Allow shadow hosts with tabindex < 0, but only when
   `delegatesFocus=false`
 - In sorting by tabindex, treat such shadow hosts as `tabindex=0`
 - Exclude those shadow hosts in Step 4.
    Takayoshi Kochi committed Aug 29, 2016
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