Fix plugin rendering bug when video surface is not ready. do not merge

cherry-pick of bf6900fe796a697400203ab777001716f3d83a0a

The browser incorrectly jumps out of the compositing step for a
plugin early if it detects a video surface is not ready. The
correct behavior is to skip rendering the video and proceed to
rendering the other plugin contents.

bug: 5525272
Change-Id: I12acb477890303d03c99ffa13729fd7e7eefc800
1 file changed