Commits on Sep 13, 2016

1. Use fn pipeline_id consistently, not fn pipeline …

   Consistently use the name 'pipeline_id' to refer to a function that
   returns an (optional) PipelineId.
   
   This was prompted by discovering both fn pipeline and fn pipeline_id
   doing the same job in htmliframeelement.rs.
   
   Note that there is fn pipeline in components/compositing/compositor.rs,
   but that actually returns an Option<&CompositionPipeline>, not any kind
   of PipelineId.

   

   aneeshusa committed Sep 13, 2016
   9d097e7

2. Consistently use parent_pipeline_id …

   Instead of containing_pipeline_id, use parent_pipeline_id because it is
   more clear that it refers to the immediate parent.

   

   aneeshusa committed Sep 13, 2016
   b9b25b6

3. Excise SubpageId and use only PipelineIds …

   SubpageId was originally introduced in 2013 to help iframes keep track of
   their associated (children) pipelines. However, since each pipeline
   already has a PipelineId, and those are unique, those are sufficient
   to keep track of children.

   

   aneeshusa committed Sep 13, 2016

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