Tests resource priorities.

sendSyncScriptRequest
Request: empty-script.js?sync priority: High
sendAsyncScriptRequest
Request: empty-script.js?async priority: Low
sendModuleScriptRequest
Request: module1.js priority: High
Request: module2.js priority: High
sendScriptRequestPrecededByImage
Request: slow-script.pl?delay=500&sendScriptRequestPrecededByImage priority: High
Request: abe.png?precedingScript priority: Medium
Request: empty-script.js?precededByImage priority: Medium
sendScriptRequestPrecededByPreloadedImage
Request: abe.png?preloaded priority: Low
Request: style.css?precededByPreloadedImage priority: VeryHigh
sendStyleRequestPrecededByImage
Request: slow-script.pl?delay=500&sendStyleRequestPrecededByImage priority: High
Request: abe.png?precedingStyle priority: Medium
Request: style.css?precededByImage priority: Medium
sendStyleRequestPrecededByPreloadedImage
Request: abe.png?preloaded priority: Low
Request: empty-script.js?precededByPreloadedImage priority: High
sendXHRSync
Request: empty.html?xhr-sync priority: VeryHigh
sendXHRAsync
Request: empty.html?xhr-async priority: High
sendImageRequest
Request: abe.png?image priority: Low
sendStyleRequest
Request: style.css?style priority: VeryHigh
createIFrame
Request: empty.html?iframe priority: VeryHigh
sendScriptsFromDocumentWriteAfterImage
Request: slow-script.pl?delay=500&sendScriptsFromDocumentWriteAfterImage priority: High
Request: abe.png?precedingDocWrite priority: Medium
Request: docwrite.js priority: Medium
Request: empty-script.js?docWritten-1 priority: High
Request: empty-script.js?docWritten-2 priority: High
Request: empty-script.js?docWritten-3 priority: High