Commits on Jan 25, 2016

1. compositing: Fix a couple of bugs that prevented iframes from painting …

   after navigation.
   
   The first bug was that iframes were not reflowed in their parent DOM
   when the child page navigated. This is fixed by simply having the
   constellation notify the appropriate script thread when navigation
   occurs.
   
   The second bug was that the compositor was unable to adjust the pipeline
   for existing iframe layers, only new ones. This patch adds logic to do
   that.
   
   Closes #8081.

   

   pcwalton committed Jan 25, 2016

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