DevTools: [FlameChart] do shift for horizontal two fingers gesture and zoom for vertical two fingers gesture.
DevTools: [FlameChart] do shift for horizontal two fingers gesture and zoom for vertical two fingers gesture.

BUG=none
TEST=none
R=pfeldman, yurys@chromium.org

Review URL: https://codereview.chromium.org/14403002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@148843 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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