Add an explicit flush after copyTextureCHROMIUM() to make the WebGL layer contents updated.
Add an explicit flush after copyTextureCHROMIUM() to make the WebGL layer contents updated.

It can avoid reading from previous unchanged WebGL layer content during printing.

BUG=351956

Review URL: https://codereview.chromium.org/197213014

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@169637 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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