Add some plumbing for safe browsing

Add some plumbing for safe browsing
https://bugs.webkit.org/show_bug.cgi?id=188709

Reviewed by Tim Horton.

Source/WebCore:

No change in behavior.  Just passing around unused booleans.
We will need this for a way to load a page even though safe browsing says it's unsafe.

* WebCore.xcodeproj/project.pbxproj:
* loader/EmptyClients.cpp:
(WebCore::EmptyFrameLoaderClient::dispatchDecidePolicyForNavigationAction):
* loader/EmptyFrameLoaderClient.h:
* loader/FrameLoadRequest.h:
(WebCore::FrameLoadRequest::setShouldSkipSafeBrowsingCheck):
(WebCore::FrameLoadRequest::shouldSkipSafeBrowsingCheck):
* loader/FrameLoader.cpp:
(WebCore::FrameLoader::loadArchive):
(WebCore::FrameLoader::loadURL):
(WebCore::FrameLoader::load):
(WebCore::FrameLoader::loadWithNavigationAction):
(WebCore::FrameLoader::loadWithDocumentLoader):
(WebCore::FrameLoader::shouldReloadToHandleUnreachableURL):
(WebCore::FrameLoader::reloadWithOverrideEncoding):
(WebCore::FrameLoader::reload):
(WebCore::FrameLoader::loadPostRequest):
(WebCore::FrameLoader::continueLoadAfterNewWindowPolicy):
(WebCore::FrameLoader::loadDifferentDocumentItem):
* loader/FrameLoader.h:
(WebCore::FrameLoader::loadWithDocumentLoader):
(WebCore::FrameLoader::loadWithNavigationAction):
* loader/FrameLoaderClient.h:
* loader/PolicyChecker.cpp:
(WebCore::PolicyChecker::checkNavigationPolicy):
* loader/PolicyChecker.h:
* loader/ShouldSkipSafeBrowsingCheck.h: Added.

Source/WebKit:

Also adding a URL to SafeBrowsingResult because we'll need it.
Also adding a bool to LoadParameters because we will need to do special things
when loading the safe browsing warning, like adding a way to skip the safe browsing check.

* Shared/LoadParameters.cpp:
(WebKit::LoadParameters::encode const):
(WebKit::LoadParameters::decode):
* Shared/LoadParameters.h:
* UIProcess/Cocoa/SafeBrowsingResultCocoa.mm:
(WebKit::SafeBrowsingResult::SafeBrowsingResult):
* UIProcess/Cocoa/WebPageProxyCocoa.mm:
(WebKit::WebPageProxy::beginSafeBrowsingCheck):
* UIProcess/SafeBrowsingResult.h:
(WebKit::SafeBrowsingResult::url const):
* UIProcess/WebPageProxy.cpp:
(WebKit::WebPageProxy::loadAlternateHTML):
(WebKit::WebPageProxy::decidePolicyForNavigationActionAsync):
(WebKit::WebPageProxy::decidePolicyForNavigationAction):
(WebKit::WebPageProxy::decidePolicyForNavigationActionSync):
* UIProcess/WebPageProxy.h:
* UIProcess/WebPageProxy.messages.in:
* WebProcess/WebCoreSupport/WebFrameLoaderClient.cpp:
(WebKit::WebFrameLoaderClient::dispatchDecidePolicyForNavigationAction):
* WebProcess/WebCoreSupport/WebFrameLoaderClient.h:

Source/WebKitLegacy/mac:

* WebCoreSupport/WebFrameLoaderClient.h:
* WebCoreSupport/WebFrameLoaderClient.mm:
(WebFrameLoaderClient::dispatchDecidePolicyForNavigationAction):

Source/WebKitLegacy/win:

* WebCoreSupport/WebFrameLoaderClient.cpp:
(WebFrameLoaderClient::dispatchDecidePolicyForNavigationAction):
* WebCoreSupport/WebFrameLoaderClient.h:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@234998 268f45cc-cd09-0410-ab3c-d52691b4dbfc