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Previously on Windows, WebInputEvents generated from ui::Events would call
|GetMessageTime()| to initialize the WebInputEvent timestamp. There are no
guarantees that such a call is valid at that time.  Instead, use the MSG.time
timestamp generated when the ui::Event was first created from the HWND message.

BUG=367156

Review URL: https://codereview.chromium.org/252083002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@267056 0039d316-1c4b-4281-b951-d872f2087c98