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The GetDmabufId() method is getting an identifier of a Dma-buf
VideoFrame. The method is used for all DmabufVideoFramePool
implementations, not only PlatformVideoFramePool. This CL moves the
method to DmabufVideoFramePool.

BUG=b:136716638
TEST=media_unittests --gtest_filter=PlatformVideoFramePoolTest.*

Change-Id: I6950c1cf5a5127778a3dba2bbf2475fd4779a679
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1824501
Auto-Submit: Chih-Yu Huang <akahuang@chromium.org>
Commit-Queue: Chih-Yu Huang <akahuang@chromium.org>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#700120}