Button:Truncating labels

Build 4395 on phosphor-button
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BaselineBuild 3594 on marianmwang-truncate-button-text
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LatestBuild 4395 on phosphor-button
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Baseline History
Build 4395c08d0e7
Current build. There are unaccepted changes, so build 3594 is still the baseline.
Build 359485d2abc current baseline
Accepted by Juan Andrade.
Build 19956d54a6b
Accepted by Juan Andrade.
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