'Paste' & 'Paste as plain text' should check edit_flags.

'Paste' and 'Paste as plain text' should check edit_flags first
before making clipboard call, as clipboard call is expensive and should
not happen unnecessarily.

BUG=439774

Review URL: https://codereview.chromium.org/751823004

Cr-Commit-Position: refs/heads/master@{#307467}
1 file changed