decoding is done if the decoder is available, with errors handled
accordingly. the encoded frame count should be sufficient for this test.
+ remove HandleDecodeResult() as it's redundant given the base
implementation
BUG=webm:1233
Change-Id: I513c1c3475c58a746f4df627491bdc392fe21416
Since combining VPX_DL_REALTIME with VPX_RC_FIRST_PASS is basically
nonsense, ignore the user's pass setting when this happens and
behave as if the requested encode is a single pass encode.
BUG=webm:1233
Change-Id: I5ee4c4e5838c4ca6d24988890aae490b10826db2