[Pepper][Compositor] Fix the compositor stops updating texture issue.
[Pepper][Compositor] Fix the compositor stops updating texture issue.

BUG=417408

Review URL: https://codereview.chromium.org/601293003

Cr-Commit-Position: refs/heads/master@{#296952}
(cherry picked from commit b25533eb65de20237dff5ea50606e3339e9bd9ca)

Review URL: https://codereview.chromium.org/613813002

Cr-Commit-Position: 0d344d3782ceeadf0e8e8be3f4ce70193b218c54@{#519}
Cr-Branched-From: 2cb3f0147827a1600e8cbbcc52ca24c0febcb7a4@{#290040}

littlstar/chromium.src,littlstar/chromium.src,ondra-novak/chromium.src,ondra-novak/chromium.src,ondra-novak/chromium.src,littlstar/chromium.src,littlstar/chromium.src,ondra-novak/chromium.src,ondra-novak/chromium.src,ondra-novak/chromium.src,littlstar/chromium.src,ondra-novak/chromium.src,ondra-novak/chromium.src,ondra-novak/chromium.src,littlstar/chromium.src,littlstar/chromium.src,littlstar/chromium.src