Dynamic changes are handled correctly because content property changes already
cause a reframe.
This implements the same bits as Blink / WebKit do (single content item which is
an image, otherwise gets ignored), except for the edge cases where you use this
on an image.
In order to handle the edge cases right, we completely isolate the
nsImageLoadingContent usage based on `mKind`.
Blink's and WebKit's behavior there makes no sense and it's erratic, what I
implemented is consistent (we apply to images as long as they don't generate a
box, and we don't look at alt text or broken icons), though I'll update to
whatever the WG decides in https://github.com/w3c/csswg-drafts/issues/2831 /
https://github.com/w3c/csswg-drafts/issues/2832.
I don't think it matters in terms of web compat in any case.
MozReview-Commit-ID: JUurhC60hWr
This patch adds three telemetry scalars to track how WebP is used. All
of these scalars are updated when we do the MIME type confirmation for
an imgRequest when the first data comes in. We know at this point we
decided to load the given content, so there should be minimal false
positives for data the browser loaded but never displayed.
The first two scalars are merely whether or not WebP was observed. One
is for probes, which are tiny WebP images suggested by the Google WebP
FAQ to probe for different aspects of WebP support (lossy, animated,
etc). We want to count this separately as actual WebP content that the
website wishes us to display. Probes will give a measure of how many
users visit websites that probe for WebP support, and content will give
a measure of how many websites don't care and just give us WebP images
regardless.
The third scalar is intended to give a relative measure of how many WebP
images we are being served relative to all other image types. We expect
the ratio to be small, but it would be good to confirm this from the
data.
Summary:
- Add explicit keyword on ProcessCount ctor
- Fix an unused variable in a loop
Reviewers: marco
Reviewed By: marco
Bug #: 1471882
Differential Revision: https://phabricator.services.mozilla.com/D1864
--HG--
extra : rebase_source : be0ae98ba0b54fc626b6857336c59d114be1e6f3
Currently, if an event is consumed in the main process, EventStateManager
does not send it to remote process. However, this is unexpected behavior
for some WidgetKeyboardEvent dispatchers. OS sometimes has consumed native
key events before sending applications. For example, Alt key on Windows
should activate menu bar of focused window but Alt key may be consumed before
focused window receives the event. In such case, we mark Alt keyboard event
as "consumed before dispatch", and chrome treat it like as its preventDefault()
is called in web content. (Note that for compatibility with other browsers,
the consumed state is not exposed to web content. So, Event.defaultPrevented
returns false in web content.)
Therefore, we need to treat "consumed" state and "cross process forwarding"
state separately. This patch makes calling WidgetEvent::PreventDefault()
always stops cross process forwarding for backward compatibility. Additionally,
for the special case mentioned above, this patch makes
WidgetEvent::PreventDefaultBeforeDispatch() take additional argument,
|aIfStopCrossProcessForwarding|. If this is CrossProcessForwarding::eStop,
the event won't be sent to remote process as same as calling PreventDefault().
Otherwise, CrossProcessForwarding::eHold, PreventDefaultBeforeDispatch() call
does not change "cross process forwarding" state. I.e., if the event's
StopCrossProcessForwarding() and PreventDefault() are not called until
EventStateManager::PostHandleEvent(), the event will be sent to remote process
as usual.
MozReview-Commit-ID: IQGWJvXetxV
--HG--
extra : rebase_source : 4ccdd500e80b8fe29e469ac3b85578e1c07c8358
This is a quick-and-dirty port. It might be nice to replace
SpecialPowersObserver with the webextensions content script injection
system at some point, but that isn't practical right now (since WE experiments
cannot implement new APIs visible to content scripts).
MozReview-Commit-ID: GinCu3VcbWK
--HG--
rename : testing/specialpowers/bootstrap.js => testing/specialpowers/api.js
extra : rebase_source : 0faf7d21c8868c957ddc7fede0d56809f27dc161
extra : intermediate-source : ffb9ce93b92dd6396bfe038d3f6a8bcf929ec277
extra : source : cca596eadd0437dc75b75c119b6c7a405805f703
