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This CL fixes a few low-volume crashes in paint preview code.

1. PaintPreviewClient - a few instances where getting the URL for the
   renderer crashes due to it being invalid. I think this is only
   possible on dev builds, but worth fixing.
2. PlayerCompositorDelegate{Android} I believe |compositor_error_| might
   already be gone on rare occasion leading to a crash downstream.

This CL was uploaded by git cl split.

Change-Id: I1a775c9a076ea11c719936d8b7dd69fe54704eae
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2401399Reviewed-by: Mehran Mahmoudi <mahmoudi@chromium.org>
Commit-Queue: Mehran Mahmoudi <mahmoudi@chromium.org>
Commit-Queue: Calder Kitagawa <ckitagawa@chromium.org>
Auto-Submit: Calder Kitagawa <ckitagawa@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805352}