GitLab

messages to enable componentizing printing. Basically, we have
modified two print messages
PrintHostMsg_AllocateTempFileForPrinting
PrintHostMsg_TempFileForPrintingWritten

to a routed message rather then a control message to simplify
implementation. However, this prevents moving the code to components.

BUG=446509

Review URL: https://codereview.chromium.org/854513002

Cr-Commit-Position: refs/heads/master@{#311544}