1919688 - Add PerfStats in more places in a11y code

Status: NEW

(Core :: Disability Access APIs, task)

Description

[James Teh [:Jamie]]

After discussion with the performance team, we've determined that PerfStats are likely to be the most helpful measurements in determining performance improvements/regressions in accessibility code. To that end, we want to add PerfStats in a bunch of additional places which are potential hot paths. To make diagnosis easier, all PerfStats should also have corresponding profile markers.

• a11y::PlatformShowHideEvent: Firing show and hide events to the OS.
• DocAccessible::ContentRemoved
• DocAccessible::PruneOrInsertSubtree: Deciding whether to add or remove an Accessible when layout changes.
• DocAccessible::ShutdownChildrenInSubtree
• DocAccessibleChild::ShowEvent: Sending newly inserted Accessibles, including cache data.
• DocAccessibleParent::RecvCache: Receiving cache updates.
• DocAccessibleParent::RecvHideEvent: Processing removals from the RemoteAccessible tree.
• DocAccessibleParent::RecvShowEvent: Processing insertions into the RemoteAccessible tree, including updating the cache.
• EventQueue::CoalesceEvents
• LocalAccessible::SendCache (already has a profiler marker)
• NotificationController::CoalesceMutationEvents
• NotificationController::WillRefresh (already has a profiler marker)
• NotifyWinEvent: Firing events to Windows specifically.
• nsAccessibilityService::Init (already has a profiler marker)