Use srcset's resource pixel density to determine intrinsic size

LayoutTests/platform/linux/fast/hidpi/image-srcset-relative-svg-expected.txt

Index: LayoutTests/platform/linux/fast/hidpi/image-srcset-relative-svg-expected.txt
diff --git a/LayoutTests/platform/linux/fast/hidpi/image-srcset-relative-svg-expected.txt b/LayoutTests/platform/linux/fast/hidpi/image-srcset-relative-svg-expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..1aa7ac6bb0b243236ac27cd9a15e6abea793299e
--- /dev/null
+++ b/LayoutTests/platform/linux/fast/hidpi/image-srcset-relative-svg-expected.txt
@@ -0,0 +1,75 @@
+layer at (0,0) size 800x600
+  RenderView at (0,0) size 800x600
+layer at (0,0) size 800x584
+  RenderBlock {HTML} at (0,0) size 800x584.25
+    RenderBody {BODY} at (8,19.91) size 784x548.34
+      RenderBlock {H2} at (0,0) size 784x27
+        RenderInline {A} at (0,0) size 59x26 [color=#0000EE]
+          RenderText {#text} at (0,0) size 59x26
+            text run at (0,0) width 59: "srcset"
+        RenderText {#text} at (59,0) size 184x26
+          text run at (59,0) width 184: " testcases for SVG"
+      RenderBlock {DIV} at (0,46.91) size 784x234.22 [border: (1px solid #808080)]
+        RenderBlock {H3} at (17,35.72) size 750x23
+          RenderText {#text} at (0,0) size 344x22
+            text run at (0,0) width 344: "Relative SVG with explicit dimensions - 1x"
+        RenderBlock (floating) {DIV} at (650.22,77.44) size 116.78x91.78 [bgcolor=#EEEEEE] [border: (1px solid #CCCCCC)]
+          RenderText {#text} at (7,7) size 55x19
+            text run at (7,7) width 55: "expected"
+          RenderBR {BR} at (62,7) size 0x19
+          RenderImage {IMG} at (7,27.39) size 102x52 [border: (1px solid #000000)]
+          RenderText {#text} at (0,0) size 0x0
+        RenderBlock (floating) {DIV} at (517.44,77.44) size 116.78x91.78 [bgcolor=#EEEEEE] [border: (1px solid #CCCCCC)]
+          RenderText {#text} at (7,7) size 35x19
+            text run at (7,7) width 35: "actual"
+          RenderBR {BR} at (42,7) size 0x19
+          RenderImage {IMG} at (7,27.39) size 102x52 [border: (1px solid #000000)]
+          RenderText {#text} at (0,0) size 0x0
+        RenderBlock (anonymous) at (17,77.44) size 750x139.78
+          RenderText {#text} at (0,0) size 465x59
+            text run at (0,0) width 463: "This test should show an SVG image of size 100x50, and intrinsic/natural size"
+            text run at (0,20) width 465: "100x50.The left half of the image should be pink and there should be a purple"
+            text run at (0,40) width 113: "circle in the center."
+          RenderBR {BR} at (113,40) size 0x19
+          RenderBlock {CODE} at (0,104.78) size 696x34
+            RenderText {#text} at (0,0) size 368x17
+              text run at (0,0) width 368: "image stats: size(100,50), naturalSize(100,50)"
+            RenderBR {BR} at (368,0) size 0x17
+            RenderText {#text} at (0,17) size 696x17
+              text run at (0,17) width 696: "image codes: <img id=\"svg5\" src=\"resources/relativesrcset.svg\" width=\"100\" height=\"50\">"
+          RenderText {#text} at (696,119) size 4x20
+            text run at (696,119) width 4: " "
+          RenderText {#text} at (0,0) size 0x0
+          RenderBR {BR} at (700,119) size 0x20
+      RenderBlock {DIV} at (0,297.13) size 784x251.22 [border: (1px solid #808080)]
+        RenderBlock {H3} at (17,35.72) size 750x23
+          RenderText {#text} at (0,0) size 344x22
+            text run at (0,0) width 344: "Relative SVG with explicit dimensions - 4x"
+        RenderBlock (floating) {DIV} at (650.22,77.44) size 116.78x91.78 [bgcolor=#EEEEEE] [border: (1px solid #CCCCCC)]
+          RenderText {#text} at (7,7) size 55x19
+            text run at (7,7) width 55: "expected"
+          RenderBR {BR} at (62,7) size 0x19
+          RenderImage {IMG} at (7,27.39) size 102x52 [border: (1px solid #000000)]
+          RenderText {#text} at (0,0) size 0x0
+        RenderBlock (floating) {DIV} at (517.44,77.44) size 116.78x91.78 [bgcolor=#EEEEEE] [border: (1px solid #CCCCCC)]
+          RenderText {#text} at (7,7) size 35x19
+            text run at (7,7) width 35: "actual"
+          RenderBR {BR} at (42,7) size 0x19
+          RenderImage {IMG} at (7,27.39) size 102x52 [border: (1px solid #000000)]
+          RenderText {#text} at (0,0) size 0x0
+        RenderBlock (anonymous) at (17,77.44) size 750x156.78
+          RenderText {#text} at (0,0) size 463x59
+            text run at (0,0) width 463: "This test should show an SVG image of size 100x50, and intrinsic/natural size"
+            text run at (0,20) width 461: "50x25. The left half of the image should be pink and there should be a purple"
+            text run at (0,40) width 113: "circle in the center."
+          RenderBR {BR} at (113,40) size 0x19
+          RenderBlock {CODE} at (0,104.78) size 750x51
+            RenderText {#text} at (0,0) size 368x17
+              text run at (0,0) width 368: "image stats: size(100,50), naturalSize(100,50)"
+            RenderBR {BR} at (368,0) size 0x17
+            RenderText {#text} at (0,17) size 696x34
+              text run at (0,17) width 696: "image codes: <img id=\"svg6\" src=\"\" srcset=\"resources/relativesrcset.svg 4x\" width=\"100\""
+              text run at (0,34) width 96: "height=\"50\">"
+          RenderText {#text} at (0,0) size 0x0
+          RenderText {#text} at (0,0) size 0x0
+          RenderBR {BR} at (0,0) size 0x0