Add preloader support for picture based source selection

LayoutTests/http/tests/loading/preload-picture-nested-expected.txt

Index: LayoutTests/http/tests/loading/preload-picture-nested-expected.txt
diff --git a/LayoutTests/http/tests/loading/preload-image-sizes-expected.txt b/LayoutTests/http/tests/loading/preload-picture-nested-expected.txt
similarity index 50%
copy from LayoutTests/http/tests/loading/preload-image-sizes-expected.txt
copy to LayoutTests/http/tests/loading/preload-picture-nested-expected.txt
index 6eec29e513cb3a7abf1f907b4dd55f393f4f6eb1..7ff4a7bff8feecaf4a579b5ac2cdac9be2878bfb 100644
--- a/LayoutTests/http/tests/loading/preload-image-sizes-expected.txt
+++ b/LayoutTests/http/tests/loading/preload-picture-nested-expected.txt
@@ -3,6 +3,7 @@ main frame - didCommitLoadForFrame
 main frame - didFinishDocumentLoadForFrame
 main frame - didHandleOnloadEventsForFrame
 main frame - didFinishLoadForFrame
+PASS internals.isPreloaded('resources/preload-test.jpg?0'); is true
 PASS internals.isPreloaded('resources/image2.png'); is true
 PASS internals.isPreloaded('resources/preload-test.jpg?1'); is false
 PASS internals.isPreloaded('resources/base-image1.png?1'); is false
@@ -24,31 +25,13 @@ PASS internals.isPreloaded('resources/preload-test.jpg?5'); is false
 PASS internals.isPreloaded('resources/base-image1.png?5'); is false
 PASS internals.isPreloaded('resources/base-image2.png?5'); is false
 PASS internals.isPreloaded('resources/base-image3.png?5'); is true
-PASS internals.isPreloaded('resources/preload-test.jpg?6'); is false
-PASS internals.isPreloaded('resources/base-image1.png?6'); is false
-PASS internals.isPreloaded('resources/base-image2.png?6'); is false
-PASS internals.isPreloaded('resources/base-image3.png?6'); is true
-PASS internals.isPreloaded('resources/preload-test.jpg?7'); is false
-PASS internals.isPreloaded('resources/base-image1.png?7'); is false
-PASS internals.isPreloaded('resources/base-image2.png?7'); is false
-PASS internals.isPreloaded('resources/base-image3.png?7'); is true
-PASS internals.isPreloaded('resources/preload-test.jpg?8'); is false
-PASS internals.isPreloaded('resources/base-image1.png?8'); is false
-PASS internals.isPreloaded('resources/base-image2.png?8'); is false
-PASS internals.isPreloaded('resources/base-image3.png?8'); is true
-PASS internals.isPreloaded('resources/preload-test.jpg?9'); is false
-PASS internals.isPreloaded('resources/base-image1.png?9'); is false
-PASS internals.isPreloaded('resources/base-image2.png?9'); is false
-PASS internals.isPreloaded('resources/base-image3.png?9'); is true
-PASS internals.isPreloaded('resources/dup-image1.png?7'); is false
-PASS internals.isPreloaded('resources/dup-image1.png?8'); is false
-PASS internals.isPreloaded('resources/dup-image2.png?8'); is false
-PASS internals.isPreloaded('resources/dup-image3.png?8'); is false
-PASS internals.isPreloaded('resources/preload-test.jpg?10'); is true
-PASS internals.isPreloaded('resources/base-image1.png?10'); is false
-PASS internals.isPreloaded('resources/base-image2.png?10'); is false
-PASS internals.isPreloaded('resources/base-image3.png?10'); is false
+PASS internals.isPreloaded('resources/preload-test.jpg?51'); is false
+PASS internals.isPreloaded('resources/preload-test.jpg?52'); is true
+PASS internals.isPreloaded('resources/preload-test.jpg?6'); is true
 PASS successfullyParsed is true
 
 TEST COMPLETE
-            
+    
+ 
+ 
+