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The opacity stays 0.2f if the window is created and shown in inactive state because the opacity is set back to 1.0f only when the animation is applied. This CL uses 1.0f opacity as initial opacity and when transitioning from/to small shadow.

BUG=433574
TEST=manual test. See the bug for repro step.

Review URL: https://codereview.chromium.org/798673002

Cr-Commit-Position: refs/heads/master@{#308187}