Fixing a reader size overflow whenunflattening large bitmaps

[junov1, 2012-05-24 21:23:50]

This patch prevents a bogus assertion in debug builds when unflattening a large
bitmap object. In SkFlatBitmap::unflatten, the size of the readbuffer was
arbitrarily set to 1MB, so images larger that 1MB caused an assertion when
attempting to read past the end of the read buffer.

[reed1, 2012-05-25 12:03:13]

Derek added the SkOrderedWriteBuffer. I nominate him to review this, as I think
he noticed the 1Meg and didn't change it at the time...

[DerekS, 2012-05-29 15:38:33]

On 2012/05/25 12:03:13, reed1 wrote:
> Derek added the SkOrderedWriteBuffer. I nominate him to review this, as I
think
> he noticed the 1Meg and didn't change it at the time...

LGTM.  I have another CL in the works that refactors a lot of this code and has
this exact change in it.

[junov1, 2012-07-16 18:56:33]

Fixed with r4059