UserAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.57 Safari/537.36

Steps to reproduce the problem:
1. ::StretchDIBits can return 0 or GDI_ERROR on failure
2. StretchDIBits in gdi_util only DCHECKs against GDI_ERROR
3. Errors might be missed

What is the expected behavior?
Checking against both failure codes. Win32 APIs are hard, and this is an easy one to miss.

What went wrong?
::StretchDIBits (https://msdn.microsoft.com/en-us/library/vs/alm/dd145121.aspx) may fail, and the DCHECK won't catch it.

Did this work before? N/A 

Chrome version: 50.0.2661.57  Channel: beta
OS Version: 10.0
Flash Version: Shockwave Flash 21.0 r0

StretchDIBits can also return 0 if no scan lines are copied, but is that reasonable scenario anyways?