VideoFramePool: limit the number of provided buffers

This CL moves limitation logic from C2VdaPooledBufferPool to
VideoFramePool. This will allow removal of C2VdaPooledBufferPool.

Bug: 268301611
Bug: 268305422
Bug: 270329448
Bug: 238710012
Bug: 238390060
Bug: 270331759
Bug: 238709912
Test: CtsMediaCodecTestCases
Test: CtsMediaDecoderTestCases
Test: CtsMediaV2TestCases
Test: GtsExoPlayerTestCases com.google.android.exoplayer.gts.CommonEncryptionDrmTest#cencSchemeTypeV*
Change-Id: I78abfdbcda6f9b3de2a6d5bcfd705a7028490f9b