Implement device-ram client hints header

third_party/WebKit/LayoutTests/http/tests/misc/client-hint-accept-on-subresource.html

Index: third_party/WebKit/LayoutTests/http/tests/misc/client-hint-accept-on-subresource.html
diff --git a/third_party/WebKit/LayoutTests/http/tests/misc/client-hint-accept-on-subresource.html b/third_party/WebKit/LayoutTests/http/tests/misc/client-hint-accept-on-subresource.html
index 1b3a54cac7fea42061d068208c9875f7836c114b..e4ac8eb5b07c153afedb3af4f2d95bacf6b1b221 100644
--- a/third_party/WebKit/LayoutTests/http/tests/misc/client-hint-accept-on-subresource.html
+++ b/third_party/WebKit/LayoutTests/http/tests/misc/client-hint-accept-on-subresource.html
@@ -12,11 +12,18 @@
             assert_unreached("Image should not have loaded.");
         };
 
+        var loadDeviceRamImage = function() {
+            var img = new Image();
+            img.src = 'resources/image-checks-for-device-ram.php';
+            img.onload = t.step_func(unreached);
+            img.onerror = t.step_func(function(){ t.done(); });
+            body.appendChild(img);
+        };
         var loadRWImage = function() {
             var img = new Image();
             img.src = 'resources/image-checks-for-width.php';
             img.onload = t.step_func(unreached);
-            img.onerror = t.step_func(function(){ t.done(); });
+            img.onerror = t.step_func(loadDeviceRamImage);
             body.appendChild(img);
         };
         t.step(function() {