Web Inspector: Add support for search in single resource to page agent.

Web Inspector: Add support for search in single resource to page agent.
https://bugs.webkit.org/show_bug.cgi?id=68998

Reviewed by Pavel Feldman.

Source/WebCore:

Test: http/tests/inspector/search/search-in-resource.html

* inspector/ContentSearchUtils.cpp:
(WebCore::ContentSearchUtils::getRegularExpressionMatchesByLines):
* inspector/ContentSearchUtils.h:
* inspector/Inspector.json:
* inspector/InspectorPageAgent.cpp:
(WebCore::buildObjectForSearchMatch):
(WebCore::InspectorPageAgent::searchInResource):
* inspector/InspectorPageAgent.h:
* inspector/front-end/Resource.js:
(WebInspector.Resource.prototype.searchInContent):
* inspector/front-end/SourceFile.js:
(WebInspector.ResourceContentProvider.prototype.requestContent):
(WebInspector.ResourceContentProvider.prototype.searchInContent):
* inspector/front-end/UISourceCode.js:
(WebInspector.ContentProvider.prototype.requestContent):
(WebInspector.ContentProvider.prototype.searchInContent):

LayoutTests:

* http/tests/inspector/search/search-in-resource-expected.txt: Added.
* http/tests/inspector/search/search-in-resource.html: Added.
* http/tests/inspector/search/search-in-resources.html:
* http/tests/inspector/search/search-test.js:
(initialize_SearchTest.InspectorTest.dumpSearchResults):
(initialize_SearchTest.InspectorTest.dumpSearchMatches):
(initialize_SearchTest):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@96223 268f45cc-cd09-0410-ab3c-d52691b4dbfc