Fix texture upload size and track it #2950
Merged
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Fixes #2930
Also, apparently, we were uploading way more data then we needed. Say, if the client (Gecko) stores texture data in a 1GB memory buffer, and it wants to upload the left-top texel only, we'd fill up the PBO with all of that 1GB... But the good news is - this should be fixed with this PR.
TODO:gecko try push: https://treeherder.mozilla.org/#/jobs?repo=try&revision=78f3185784677b34223ed2cce9cd2358f0c93209This change is