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Canvas2DLayerBridge keeps track of the current resource on the
cc::TextureLayer to avoid unnecessary updates to the layer's resource if
it was not updated. But it missed a case where the TextureLayer's
resource was being cleared if the canvas is made invisible after
hibernation.

Avoid the above by simply asking the layer for its current resource
instead of mirroring that state in Canvas2DLayerBridge and running into
issues if we can't keep them consistent.

R=enne@chromium.org,fserb@chromium.org

Bug: 977474
Change-Id: I6850115ffc019d7148a4dad40f97bb66029aa4d4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1680296Reviewed-by: Fernando Serboncini <fserb@chromium.org>
Commit-Queue: Fernando Serboncini <fserb@chromium.org>
Auto-Submit: Khushal <khushalsagar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#673423}