Increase event timer for debug builds
Increase event timer for debug builds

Without this I readily hit the timeout in a debug build on windows.

BUG=none
TEST=none
R=sadrul@chromium.org

Review URL: https://codereview.chromium.org/1490843002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#362466}

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