Don't put timers with ID == 0 into the global timer map.

testing/resources/bug_679649.pdf

Index: testing/resources/bug_679649.pdf
diff --git a/testing/resources/bug_679649.pdf b/testing/resources/bug_679649.pdf
new file mode 100644
index 0000000000000000000000000000000000000000..cea176bca054b244131436a9b5dde6d7e480becd
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+++ b/testing/resources/bug_679649.pdf
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