Commits on Jul 24, 2018

1. Only trigger a frame build if scene properties have changed. …

   In many important use cases (e.g. video playback on youtube) the
   display list doesn't change very often. Typically, the only
   thing changing between frames are the natively decoded video
   texture surfaces.
   
   In these cases, we can save a significant amount of CPU usage
   and battery power by not building a frame at all.
   
   Previously, any call to set/update dynamic properties would
   trigger a frame rebuild. However, it's often the case that
   Gecko sends dynamic properties updates that are either empty
   or exactly the same as the previous frame.
   
   With this change, WR will compare the scene properties and
   only trigger a frame rebuild if they have actually changed.
   
   This is a partial step towards fixing #2917 - a couple of
   other changes are also needed to completely avoid a frame
   rebuiild in this use case.

   

   gw3583 committed Jul 24, 2018

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