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This patch includes a fix and refactoring on several layout tests for promise from AudioContext.suspend() and .resume().

|Audit| task runner handles the sequential execution of asynchrous test tasks.

BUG=460504

Review URL: https://codereview.chromium.org/945023002

git-svn-id: svn://svn.chromium.org/blink/trunk@190694 bbb929c8-8fbe-4397-9dbb-9b2b20218538