858b0f4703
When screen/window capturers fail to use shared memory, they are supposed to fall back to XGetImage(). It's slower, but should still allow to capture desktop content. This wasn't implemented correclty in XScreenPixelBuffer - it was failing completely when shmget() returns an error. BUG=705146 Review-Url: https://codereview.webrtc.org/2775793003 Cr-Commit-Position: refs/heads/master@{#17401}