Add expectations for three layout tests failing on Site Isolation bots.

third_party/WebKit/LayoutTests/FlagExpectations/site-per-process

Index: third_party/WebKit/LayoutTests/FlagExpectations/site-per-process
diff --git a/third_party/WebKit/LayoutTests/FlagExpectations/site-per-process b/third_party/WebKit/LayoutTests/FlagExpectations/site-per-process
index 6c85d3fbac6aff51c0b2e891f8d19af921c22bda..f978a39d90c9bd819bd0c89f7fddc23c35fc8529 100644
--- a/third_party/WebKit/LayoutTests/FlagExpectations/site-per-process
+++ b/third_party/WebKit/LayoutTests/FlagExpectations/site-per-process
@@ -13,8 +13,8 @@ crbug.com/669083 http/tests/security/frameNavigation/xss-DENIED-top-navigation-w
 crbug.com/669083 virtual/mojo-loading/http/tests/security/frameNavigation/xss-DENIED-top-navigation-without-user-gesture.html [ Failure ]
 
 # https://crbug.com/661725 - Propagating user gesture via postMessage doesn't work for OOPIFs
-crbug.com/661725 http/tests/security/frameNavigation/xss-ALLOWED-top-navigation-after-postMessage.html [ Timeout ]
-crbug.com/661725 virtual/mojo-loading/http/tests/security/frameNavigation/xss-ALLOWED-top-navigation-after-postMessage.html [ Timeout ]
+crbug.com/661725 http/tests/security/frameNavigation/xss-ALLOWED-top-navigation-after-postMessage.html [ Failure Timeout ]
+crbug.com/661725 virtual/mojo-loading/http/tests/security/frameNavigation/xss-ALLOWED-top-navigation-after-postMessage.html [ Failure Timeout ]
 
 # https://crbug.com/611838 - regression when geolocation tests use JS mock.
 crbug.com/611838 http/tests/security/powerfulFeatureRestrictions/geolocation-on-secure-origin-in-insecure-origin.html [ Timeout ]
@@ -171,6 +171,14 @@ crbug.com/24182 virtual/mojo-loading/http/tests/perf/large-inlined-script.html [
 # https://crbug.com/672570: autoplay-crossorigin.html fails w/ --site-per-process
 crbug.com/672570 http/tests/media/autoplay-crossorigin.html [ Timeout ]
 
+# https://crbug.com/680201: referrer-policy-attribute-import-no-referrer.html fails w/ --site-per-process
+crbug.com/680201 http/tests/security/referrer-policy-attribute-import-no-referrer.html [ Failure ]
+crbug.com/680201 virtual/mojo-loading/http/tests/security/referrer-policy-attribute-import-no-referrer.html [ Failure ]
+
+# https://crbug.com/680307: blob-url-in-iframe.html is missing PASS w/ --site-per-process
+crbug.com/680307 http/tests/security/mixedContent/blob-url-in-iframe.html [ Failure ]
+crbug.com/680307 virtual/mojo-loading/http/tests/security/mixedContent/blob-url-in-iframe.html [ Failure ]
+
 # TODO(lukasza, alexmos): Triage these failures.
 Bug(none) fast/frames/cached-frame-counter.html [ Timeout ]
 Bug(none) fast/frames/frame-limit.html [ Timeout ]