Browser API: implement iframe.reload()
fixes#8575
The implementation is naive, and doesn't support the `hardreload` parameter.
And for the test, I'm not sure how else I can test the reload.
<!-- Reviewable:start -->
[<img src="https://reviewable.io/review_button.png" height=40 alt="Review on Reviewable"/>](https://reviewable.io/reviews/servo/servo/8618)
<!-- Reviewable:end -->
Add test to constellation to avoid writing reftest image if there are pending frames.
This changes several tests that contain <iframe></iframe> from FAIL to TIMEOUT. This is correct
since there is a bug that prevents these iframes from ever rendering.
~~~There are also a few previous FAILs that changed to OK. These may be intermittents or they
may genuinely be fixed by this change.~~~
<!-- Reviewable:start -->
[<img src="https://reviewable.io/review_button.png" height=40 alt="Review on Reviewable"/>](https://reviewable.io/reviews/servo/servo/8612)
<!-- Reviewable:end -->
Also change when pipelines become active.
This makes the constellation activate a pipeline as the current frame
when it is ready to do initial reflow, rather than when it is ready
to paint.
This fixes a number of intermittent failures that could previously occur
if an iframe was not visible - which would mean it was never moved from
a pending frame in the constellation to an active frame.
(It happens that webrender exposes these intermittents as permanent failures).
Moved CompositorMsg enum into compositing crate.
moved CompositorMsg enum into compositing crate.
moved from components/msg/constellation_msg.rs
to components/compositing/lib.rs
fixes#8832
<!-- Reviewable:start -->
[<img src="https://reviewable.io/review_button.png" height=40 alt="Review on Reviewable"/>](https://reviewable.io/reviews/servo/servo/8898)
<!-- Reviewable:end -->
Add slow path for hit testing of iframe behind positioned content layer
Fixes browser.html blocker #8759. r? @pcwalton
This adds a slow path for cases where the compositor's layer-based hit testing is incorrect. If the script task discovers that a mouse event should have been dispatched to an iframe, it bounces the event back to the constellation to be forwarded to the correct pipeline.
This isn't terribly slow (on the slow path, it adds one extra round-trip message between script and constellation), but if we want to optimize this better we could instead replace the compositor's layer hit testing with display list hit testing in the paint task. This would be a more complicated change that I think we should save for a follow-up.
This only fixes mouse input for now. A basically-identical change will be needed for touch-screen input, whether we stick with this approach or switch to the paint task.
<!-- Reviewable:start -->
[<img src="https://reviewable.io/review_button.png" height=40 alt="Review on Reviewable"/>](https://reviewable.io/reviews/servo/servo/8785)
<!-- Reviewable:end -->
Fixes#8759.
This adds a slow path for cases where the compositor's layer-based hit testing
is incorrect. To optimize for this case, we could instead replace the
layer hit testing with display-list hit testing done in the paint task.
Fixing unused attributes warnings required updating serde_macros
which required updating to rustc 1.6.0-nightly (a2866e387 2015-11-30)
which required updating some other dependencies.
