Add optional logging of per-resource cookie information

Add optional logging of per-resource cookie information
https://bugs.webkit.org/show_bug.cgi?id=180883
<rdar://problem/35802295>

Reviewed by Brent Fulgham.

In order to support the tracking of the efficacy of Intelligent
Tracking Protection, add some logging of the cookie information
associated with each loaded resource. This logging is off by default
and is enabled with `defaults write -g WebKitLogCookieInformation
-bool true`.

Source/WebCore:

No new tests -- no new user functionality added. Only new logging has
been added.

* platform/Cookie.h:
(WebCore::Cookie::Cookie):
(WebCore::Cookie::isNull const):
(WebCore::Cookie::encode const):
(WebCore::Cookie::decode):
* platform/network/cf/CookieJarCFNet.cpp:
(WebCore::canonicalCookieTime):
(WebCore::cookieCreatedTime):
(WebCore::cookieExpirationTime):
(WebCore::getRawCookies):
* platform/network/cocoa/CookieCocoa.mm:
(WebCore::cookieCreated):
(WebCore::Cookie::Cookie):
* platform/network/soup/CookieJarSoup.cpp:
(WebCore::getRawCookies):

Source/WebKit:

* NetworkProcess/NetworkProcess.cpp:
(WebKit::NetworkProcess::initializeNetworkProcess):
* NetworkProcess/NetworkProcess.h:
(WebKit::NetworkProcess::shouldLogCookieInformation const):
* NetworkProcess/NetworkProcessCreationParameters.cpp:
(WebKit::NetworkProcessCreationParameters::encode const):
(WebKit::NetworkProcessCreationParameters::decode):
* NetworkProcess/NetworkProcessCreationParameters.h:
* NetworkProcess/NetworkResourceLoader.cpp:
(WebKit::NetworkResourceLoader::didFinishLoading):
(WebKit::NetworkResourceLoader::sendResultForCacheEntry):
(WebKit::NetworkResourceLoader::shouldLogCookieInformation const):
(WebKit::NetworkResourceLoader::logCookieInformation const):
* NetworkProcess/NetworkResourceLoader.h:
* UIProcess/Cocoa/WebProcessPoolCocoa.mm:
(WebKit::WebProcessPool::platformInitializeNetworkProcess):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@226226 268f45cc-cd09-0410-ab3c-d52691b4dbfc