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In Chrome media codebase, it sometimes outputs fourcc value to log.
However, we need to table lookup to know which format it refers to.
If we convert the 32bit value into four character code (what fourcc
stands for), it is easier to get what the format is.

BUG=chromium:882339
TEST=Build and run media_unittests --gtest_filter=VideoTypesTest*

Change-Id: I806699ff93646640b69d328e2dffae0ba4e84067
Reviewed-on: https://chromium-review.googlesource.com/1216763
Commit-Queue: Shuo-Peng Liao <deanliao@google.com>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#590571}