Changes include:
- Introduce an IpcSend trait to abstract over a collection of IpcSenders
- Implement ResourceThreads collection to abstract the resource-related
sub threads across the component
- Rename original ResourceThread and ControlMsg into an unifed CoreResource__
to accommodate above changes and avoid confusions
Implement basic <media> infrastructure
This gets us to the point where we can start playing with actually integrating rust-media to process the data received by the network request, as currently it's just ignored.
<!-- Reviewable:start -->
[<img src="https://reviewable.io/review_button.png" height=40 alt="Review on Reviewable"/>](https://reviewable.io/reviews/servo/servo/8454)
<!-- Reviewable:end -->
add pass-through from doc to http-loader for referrer_policy, ref_URL
add logic for setting referer header
add script pass-through for referrer
add unit tests for setting referer header
Adding pipelineID to httpresponse message, clearner code for task1
Commit for Refactored task
Unit tests
Removing extra whitespaces.
Removing extra whitespaces.
Removing tabs whitespaces
Making Code tidier.
Style issues Fix
Test-tidy Fixes
