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Originally we use a static GetSupportedProfiles for each VEA
implementation to get a list of supported codec profiles. But
different devices of the same platform can support different
profiles. To return a correct list, they are dynamically
detected in runtime and added to GPUInfo.

BUG=350197
TEST=Run apprtc loopback and Hangout on peach pit.
Run gpu_info_unittest.

Review URL: https://codereview.chromium.org/568413002

Cr-Commit-Position: refs/heads/master@{#296147}