Commits on Mar 26, 2016

1. layout: Rewrite the block formatting context/float inline-size …

   speculation code.
   
   The old code tried to do the speculation as a single bottom-up pass
   after intrinsic inline-size calculation, which was unable to handle
   cases like this:
   
       <div>
           <div style="float: left">Foo</div>
       </div>
       <div>
           <div style="overflow: hidden">Bar</div>
       </div>
   
   No single bottom-up pass could possibly handle this case, because the
   inline-size of the float flowing out of the "Foo" block could never make
   it down to the "Bar" block, where it is needed for speculation.
   
   On the pages I tried, this regresses layout performance by 1%-2%.
   
   I first noticed this breaking some pages, like the Google SERPs, several
   months ago.

   

   pcwalton committed Mar 26, 2016

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