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The Volantis driver will dequeue a buffer in eglCreateWindowSurface.

- Remove the requirement that no buffers be dequeued when calling
  setAsyncMode() on a BufferQueueProducer, since this gets called
  from eglSwapInterval.
- Modify the tests to call setMaxDequeuedBufferCount before calling
  eglCreateWindowSurface.

Change-Id: Icc64e9933f151771bbd57035549cd5928c0b7216