https://bugs.webkit.org/show_bug.cgi?id=111133

Reviewed by Jochen Eisinger.

When generating console messages, we're often copying the page's URL
in order to add detail about where the error occurred. Generally, this
is fine, but in edge cases (multi-meg 'data:' URLs), we're using far
more memory than we should, and impacting performance.

This patch adds an 'elidedString()' method to KURL for use in this
sort of case; when generating console messages, we should insert the
elided URL rather than the full URL.

This shouldn't change any visible behavior; we're already visually
eliding URLs in console messages for URLs above 150 characters. This
patch simply changes the underlying string to ensure that no URL is
over 1k in length to begin with.

* platform/KURL.cpp:
(WebCore::KURL::elidedString): Added.
* platform/KURL.h:
    An exciting new method that gives you the same result as string()
    for URLs less than 1k long, and elides the middle of URLs longer
    than 1k by replacing everything but the first and last 0.5k with
    "...".
* bindings/ScriptControllerBase.cpp:
(WebCore::ScriptController::canExecuteScripts):
* Modules/websockets/WebSocket.cpp:
(WebCore::WebSocket::connect):
(WebCore::WebSocket::send):
* Modules/websockets/WebSocketChannel.cpp:
(WebCore::WebSocketChannel::send):
(WebCore::WebSocketChannel::fail):
* bindings/ScriptControllerBase.cpp:
(WebCore::ScriptController::canExecuteScripts):
* dom/Document.cpp:
(WebCore::Document::processHttpEquiv):
* dom/ScriptElement.cpp:
(WebCore::ScriptElement::executeScript):
* html/HTMLMediaElement.cpp:
(WebCore::HTMLMediaElement::canPlayType):
(WebCore::HTMLMediaElement::isSafeToLoadURL):
* loader/FrameLoader.cpp:
(WebCore::FrameLoader::submitForm):
(WebCore::FrameLoader::loadFrameRequest):
(WebCore::FrameLoader::commitProvisionalLoad):
(WebCore::FrameLoader::shouldInterruptLoadForXFrameOptions):
(WebCore::FrameLoader::loadProvisionalItemFromCachedPage):
(WebCore::createWindow):
* loader/MainResourceLoader.cpp:
(WebCore::MainResourceLoader::willSendRequest):
(WebCore::MainResourceLoader::responseReceived):
* loader/appcache/ApplicationCacheGroup.cpp:
(WebCore::ApplicationCacheGroup::didReceiveResponse):
(WebCore::ApplicationCacheGroup::didFail):
* loader/cache/CachedResourceLoader.cpp:
(WebCore::CachedResourceLoader::canRequest):
(WebCore::CachedResourceLoader::requestResource):
(WebCore::CachedResourceLoader::loadResource):
(WebCore::CachedResourceLoader::printAccessDeniedMessage):
* page/ContentSecurityPolicy.cpp:
(WebCore::CSPDirectiveList::checkSourceAndReportViolation):
(WebCore::CSPDirectiveList::allowScriptNonce):
(WebCore::CSPDirectiveList::allowPluginType):
    Use 'KURL::elidedString()' rather than 'KURL::string()'
* loader/MixedContentChecker.cpp:
(WebCore::MixedContentChecker::logWarning):
    Here, we're doing the same as above, but it enables us to throw
    away the asUTF8() function entirely by switching to makeString
    rather than String::format.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@144607 268f45cc-cd09-0410-ab3c-d52691b4dbfc