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Currently when the stubs code is used outside of the Chromium (i.e. in
WebRTC) the build will fail because of the missing implementation of
VLOG() - it's defined in the //base/logging.h, but WebRTC can't use that as it
uses its own //base_rtc/logging.h with RTC_LOG() functions.

To make it buildable there add a two new options to the
generate_stubs.py. The first one '--logging-function' or '-l' is used
for passing the function call for logging. Its default value is set to
'VLOG(1)' so the current code doesn't need to be updated. The second one
is '--logging-include' or '-n' that is used for passing the header file
where the function from the '--logging-function' is defined.

Change-Id: Iafc898deb818c0a140d177d0190f4db52294df0d
Reviewed-on: https://chromium-review.googlesource.com/c/1317918Reviewed-by: Patrik Höglund <phoglund@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Tomáš Popela <tomas.popela@gmail.com>
Cr-Commit-Position: refs/heads/master@{#606405}