[DevTools] Listen for "mouseup" on the top document when dragging.
[DevTools] Listen for "mouseup" on the top document when dragging.

It turned out that "mouseup" is not dispatched to iframe when it happens
outside of the window. This breaks dragging code.

BUG=434986

Review URL: https://codereview.chromium.org/749263004

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@185895 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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