Web Inspector: Reduce list of saved console messages

Web Inspector: Reduce list of saved console messages
https://bugs.webkit.org/show_bug.cgi?id=151225

Patch by Joseph Pecoraro <pecoraro@apple.com> on 2015-11-12
Reviewed by Geoffrey Garen.

Inspector saves messages so that when an inspector frontend opens it can report
these messages to the frontend. However we were saving a rather large list of
1000 messages. Most pages do not produce a large number of console messages.
However pages that live for a long time can generate many errors over time,
especially periodic engine issues such as cross-origin access errors. This could
result in a lot of wasted memory for console messages that may never be used.

Likewise when an inspector first open sending all 1000 messages to the frontend
results in a poor experience.

Lets reduce the list of saved messages. Developer will still be able to see
all messages as long as they have Web Inspector open at the time the messages
are generated.

* inspector/agents/InspectorConsoleAgent.cpp:
Reduce the list from 1000 to 100. Also, when expiring
messages from this list, chunk in 10s instead of 100s.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@192391 268f45cc-cd09-0410-ab3c-d52691b4dbfc