Add pre decode frame hook to decoder test class.

Adds a hook that derived test classes can implement to be notified
before every call to decode a frame.

Change-Id: Iefa836459cf3e5d7df9ee27f8198daf82b1be088
test-data.sha1: add missing sha1sums

vp90-2-02-size-lf-1920x1080.webm{,.md5} were added in:
ebb583d Add a test vector for loopfilter

Change-Id: I021808338935932cb742ea2621b94f44f22e3037
Move test vector list into a separate header.

Change-Id: I36f9033492f12fda7f9ce0e7a97a009aab9aab57
Merge "Add pre decode frame hook to decoder test class."
Merge "Move test vector list into a separate header."
Cleanup copyright headers.

Change-Id: I7ff2b18e085f3fffaa7f25d40e4e50427b808f43
Merge "test-data.sha1: add missing sha1sums"