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This CL extracts VaapiDecodeSurface out of VaapiVideoDecodeAccelerator
into a file on its own, because vaapi_video_decode_accelerator.cc is
quite large at 1902 lines.

It also introduces =default and adds DISALLOW_COPY_AND_ASSIGN to the
extracted class. Otherwise no new code, just moving things around.

There's also a side bonus: VaapiVideoDecodeAccelerator::VaapiDecodeSurface
uses are shortened in vaapi_video_decode_accelerator.

Test: Compile and run in simplechrome on soraka. Ran vp8, vp9
videos of crosvideo.appspot.com, verified GpuVideoDecoder engaged.

Bug: 717265
Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: Ibd7c88357b2f993a5d72e45f65dfff5d67c4194a
Reviewed-on: https://chromium-review.googlesource.com/922981
Commit-Queue: Miguel Casas <mcasas@chromium.org>
Reviewed-by: Emircan Uysaler <emircan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#537201}