ImageTest: Allow writeAHBData to fail ImageTest::SourceNativeClientBufferTargetRenderbuffer test is using EGL to create a AHB. eglCreateNativeClientBufferANDROID does not allow us to specify CPU access. So driver may allocate AHB in a way that prohibits CPU access. That will cause AHB lock to fail and writeAHBData crash. This is within AHB specification. This CL allows this to fail so that we wont crash. Bug: b/223456677 Change-Id: I549b940d1283165cec1dc48ea5b43ba917081252 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/4985627 Reviewed-by: Chris Forbes <chrisforbes@google.com> Commit-Queue: Charlie Lao <cclao@google.com>