38c7115686
Enables scrolling within the unseasoned PDF viewer's plugin frame, instead of within the extension frame. Notably, this fixes autoscroll behavior, since the plugin frame now handles its own scrolling. This required fixes for a number of would-be regressions: 1. Some keyboard shortcuts require suppressing the default scroll behavior using preventDefault(), in order to behave the same as the shipping Pepper version. Note that there are still some pre-existing regressions in the unseasoned PDF viewer; these will be fixed as part of crbug.com/1279550. 2. Tickmarks are set using WebLocalFrame::SetTickmarks() again, instead of with a Mojo IPC; this had been changed in crbug.com/1199999. 3. Scrolling uses WebLocalFrame::GetScrollOffset() again, instead of an "updateScroll" message; this had been changed in crbug.com/1101598 to support the sidenav panel. Fixed: 1271262 Change-Id: Ia98054a81766d5a0ce87820288dcc74f958d6b3c Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3294022 Reviewed-by: Daniel Hosseinian <dhoss@chromium.org> Commit-Queue: K. Moon <kmoon@chromium.org> Cr-Commit-Position: refs/heads/main@{#951352}
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