Use srcset's resource pixel density to determine intrinsic size

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

Index: LayoutTests/platform/linux/fast/hidpi/image-srcset-svg-canvas-expected.txt
diff --git a/LayoutTests/platform/linux/fast/hidpi/image-srcset-svg-canvas-expected.txt b/LayoutTests/platform/linux/fast/hidpi/image-srcset-svg-canvas-expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..248cd6fc8bd8033603aa050afca0f614c6abaa37
--- /dev/null
+++ b/LayoutTests/platform/linux/fast/hidpi/image-srcset-svg-canvas-expected.txt
@@ -0,0 +1,37 @@
+layer at (0,0) size 800x600
+  RenderView at (0,0) size 800x600
+layer at (0,0) size 800x319
+  RenderBlock {HTML} at (0,0) size 800x319.03
+    RenderBody {BODY} at (8,19.91) size 784x283.13
+      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 784x236.22 [border: (1px solid #808080)]
+        RenderBlock {H3} at (17,35.72) size 750x23
+          RenderText {#text} at (0,0) size 364x22
+            text run at (0,0) width 364: "Canvas SVG without explicit dimensions - 1x"
+        RenderBlock (floating) {DIV} at (550.22,77.44) size 216.78x141.78 [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 202x102 [border: (1px solid #000000)]
+          RenderText {#text} at (0,0) size 0x0
+        RenderBlock (floating) {DIV} at (317.44,77.44) size 216.78x141.78 [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
+          RenderHTMLCanvas {CANVAS} at (7,27.39) size 202x102 [border: (1px solid #000000)]
+          RenderText {#text} at (0,0) size 0x0
+        RenderBlock (anonymous) at (17,77.44) size 750x141.78
+          RenderText {#text} at (0,0) size 266x59
+            text run at (0,0) width 263: "This test should show an SVG image drawn"
+            text run at (0,20) width 262: "into a canvas. The canvas and image should"
+            text run at (0,40) width 266: "look the same and both should be 200x100."
+          RenderBR {BR} at (266,40) size 0x19
+          RenderBlock {CODE} at (0,75) size 0x0
+          RenderText {#text} at (0,60) size 4x19
+            text run at (0,60) width 4: " "
+          RenderBR {BR} at (4,60) size 0x19