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The transferToImageBitmap is an API in OffscreenCanvas. This API could
throw exception in certain cases, which means that the
OffscreenCanvas::transferToImageBitmap() method has a ExceptionState&
parameter.

In our current implementation, we do all the exception check in the above
method. However, we still pass the ExceptionState& parameter to the
CanvasRenderingContext::transferToImageBitmap() method, and this method
is overriden by OffscreenCanvasRenderingContext2D, WebGLRenderingContext,
and WebGL2RenderingContext. So this method in all these sub-classes also
take a ExceptionState& parameter but do nothing with it. We should not
need to pass this parameter to CanvasRenderingContext::transferToImageBitmap.

TBR=kbr@chromium.org, zmo@chromium.org
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.win:win_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel

Review-Url: https://codereview.chromium.org/2440213003
Cr-Commit-Position: refs/heads/master@{#427188}