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In old implementaion, when SourceState::Append failed, it will report
DEMUXER_ERROR_COULD_NOT_OPEN error in ChunkDemuxer::AppendData case INITIALIZING.
But in fact, appended data may include initialization segment and media segment both.
The error can happen in any point.
In MSE spec
( http://w3c.github.io/media-source/#byte-stream-formats )
The user agent must run the end of stream algorithm with the error parameter
set to "decode" when in some conditions. They all happen in parsing the appended data.
So, here when SourceState::Append fails, it should report PIPELINE_ERROR_DECODE.

Another side, when the segment parser loop successfully parses a complete
initialization segment, it should call ReportMetadata immediately. Otherwise,
when meeting PIPELINE_ERROR_DECODE but WebMediaPlayer's ready_state_ is still
ReadyStateHaveNothing, it will be treated as NetworkStateFormatError not
NetworkStateDecodeError.

This Cl will resolve above two problems.

BUG=None
TEST=LayoutTest: https://codereview.chromium.org/742653002

Review URL: https://codereview.chromium.org/710693003

Cr-Commit-Position: refs/heads/master@{#313358}