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This patch declares a new default action, "horizontal scroll", this scrolls content horizontally with deltaY of wheel events and ignores deltaX and deltaZ. This is used for default action with Shift key in default setting except on macOS. On macOS, legacy mouse's vertical wheel operation with Shift key causes native horizontal wheel event. Therefore, we don't need to use this new default action on macOS. Additionally, old default action with Shift key, navigating history, is moved to with Alt key. This makes same settings between macOS and the others. So, this is better for users who use macOS and another OS and web app developers who check wheel events only on macOS or other platform(s). For simpler implementation, default action handlers moves deltaY values to deltaX values temporarily *only* while they handle wheel events. This is performed by AutoWheelDeltaAdjuster and restored after handling it automatically. So, in other words, even if default action is "horizontal scroll", web apps receives wheel events whose deltaY is not zero but its content will be scrolled horizontally. This is same as Chromium, so, this behavior shouldn't cause any incompatible behavior with it. MozReview-Commit-ID: E4X3yZzLEAl --HG-- extra : rebase_source : e20d854c6b0a181ad4c9e7304bd9ad14256481ff
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