Masayuki Nakano ef2253b4a1 Bug 1691622 - part 9: Make nsIWidget::SynthesizeNativeMouseEvent take an XP button ID and abstract message value r=smaug,geckoview-reviewers,agi,m_kato
Currently, it takes a raw native message value, but it makes JS content too
complicated.  And on Linux, it cannot synthesize non-primary button events
because GDK has only button press and release messages which dont' include
mouse button information.

For solving these problems, this patch creates a new abstract native message
as `nsIWidget::NativeMouseMessage` and makes each widget converts it to
a platform native message.

Additionally, this patch adds an argument to make it possible its callers
to specify pressing or releasing mouse button with a DOM mouse button value.

Note that the following patch adds new argument to
`synthesizeNativeEventMouse*` for mochitests and which will be tested by
new tests.

Differential Revision: https://phabricator.services.mozilla.com/D105763
2021-02-24 01:27:10 +00:00
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