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This is a speculative fix for a DCHECK failure. If SkiaRenderer skips
swap then |current_buffer_modified_| isn't reset to false and looks like
it can violate a DCHECK condition. Add code to SwapBuffersSkipped() that
handles updating framebuffer damage rects and resetting
|current_buffer_modified_|.

Bug: 1161653
Change-Id: Ie811fca55cbf5c57ed5e4af50772e2e538f7b911
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2640895Reviewed-by: Peng Huang <penghuang@chromium.org>
Commit-Queue: kylechar <kylechar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845848}