Use ScheduleResume() instead of calling Resume() directly.
Use ScheduleResume() instead of calling Resume() directly.

Calling Resume() directly skips some "suspending" checks which
when skipped can leave the pipeline in a bad state.  Instead use
ScheduleResume() which does the necessary state checks.

BUG=591566
TEST=none / code is being refactored at present.

Review URL: https://codereview.chromium.org/1765433002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#378931}

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