502f22686c
This patch tries to dispatch `ePointerRawUpdate` with `PresShell::EventHandler::DispatchPrecedingPointerEvent` as same as usual pointer events. For using the path, this patch adds 2 internal events, `eMouseRawUpdate` and `eTouchRawUpdate` which are never dispatched into the DOM because `PresShell::EventHandler::DispatchPrecedingPointerEvent` will return `false` for that and then the caller will stop handling the internal events. There are 3 dispatchers of the internal raw update events. One is `PresShell::EnsurePrecedingPointerRawUpdate()`. This dispatches the internal event if and only if the coming event of `PresShell::HandleEvent` will cause `ePointerMove`. The reason why `PresShell::HandleEvent` handles the preceding raw-update event is, we should support `ePointerRawUpdate` events for synthesized events for tests (in-process ones) and in the main process. Additionally, if a `pointerrawupdate` event may destroy the target `<iframe>`. In such ase, the following `pointermove` may need to be dispatched on its parent window or another `<iframe>` window. Therefore, we need to dispatch the internal raw update event before considering the target window (`PresShell`) and handling the capturing element. The others are `BrowserChild::RecvRealMouseMoveEvent` and `BrowserChild::RecvRealTouchMoveEvent`. They dispatch the internal events when they won't dispatch the received event immediately to coalesce with further similar input. For avoiding to dispatch the internal event for same source event, this adds `WidgetPointerHelper::convertToPointerRawUpdate` member to check it in `PresShell::HandlePrecedingPointerRawUpdate`. Differential Revision: https://phabricator.services.mozilla.com/D243404
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