https://bugs.webkit.org/show_bug.cgi?id=100355

Reviewed by Anders Carlsson.

Source/WebCore:

Allow LoaderStrategy to override the implementation of the ResourceLoadScheduler.
Add a default implementation that just returns the current ResourceLoadScheduler.

No new tests (No behavior change).

Project file stuff:
* CMakeLists.txt:
* GNUmakefile.list.am:
* Target.pri:
* WebCore.exp.in:
* WebCore.gypi:
* WebCore.vcproj/WebCore.vcproj:
* WebCore.xcodeproj/project.pbxproj:

"Virtualize" ResourceLoadScheduler to expose build issues in preparation for future virtualization:
* loader/ResourceLoadScheduler.cpp:
(WebCore::ResourceLoadScheduler::~ResourceLoadScheduler):
* loader/ResourceLoadScheduler.h:
(ResourceLoadScheduler):

Add the new method plus a default implementation:
 * loader/LoaderStrategy.cpp:
(WebCore::LoaderStrategy::resourceLoadScheduler):
* loader/LoaderStrategy.h:

When strategies are enabled, use the LoaderStrategy for this:
* dom/ContainerNode.cpp:
(WebCore::ContainerNode::suspendPostAttachCallbacks):
(WebCore::ContainerNode::resumePostAttachCallbacks):

* loader/MainResourceLoader.cpp:
(WebCore::MainResourceLoader::loadNow):

* loader/ResourceLoader.cpp:
(WebCore::ResourceLoader::releaseResources):
(WebCore::ResourceLoader::willSendRequest):

* loader/cache/CachedResource.cpp:
(WebCore::CachedResource::load):

* loader/cache/CachedResourceLoader.cpp:
(WebCore::CachedResourceLoader::performPostLoadActions):

Source/WebKit2:

Add a WebKit2 subclass of ResourceLoadScheduler that currently adds no new functionality:
* WebProcess/Network/WebResourceLoadScheduler.cpp:
(WebKit::WebResourceLoadScheduler::~WebResourceLoadScheduler):
* WebProcess/Network/WebResourceLoadScheduler.h:

WebProcess hangs on to the default shared WebResourceLoadScheduler:
* WebProcess/WebProcess.h:
(WebKit::WebProcess::webResourceLoadScheduler):

If the NetworkProcess is enabled, return the new WebResourceLoadScheduler:
* WebProcess/WebCoreSupport/WebPlatformStrategies.cpp:
(WebKit::WebPlatformStrategies::resourceLoadScheduler):
* WebProcess/WebCoreSupport/WebPlatformStrategies.h:

* WebKit2.xcodeproj/project.pbxproj:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@132501 268f45cc-cd09-0410-ab3c-d52691b4dbfc