requestIdleCallback: Yield for high priority work

third_party/WebKit/Source/platform/testing/TestingPlatformSupport.cpp

Index: third_party/WebKit/Source/platform/testing/TestingPlatformSupport.cpp
diff --git a/third_party/WebKit/Source/platform/testing/TestingPlatformSupport.cpp b/third_party/WebKit/Source/platform/testing/TestingPlatformSupport.cpp
index 93a4be03c4d1a2194ff9242a02b9e7efeb6b826f..7289ac6b02d7d8acc2125e8c044869a820b5d86a 100644
--- a/third_party/WebKit/Source/platform/testing/TestingPlatformSupport.cpp
+++ b/third_party/WebKit/Source/platform/testing/TestingPlatformSupport.cpp
@@ -131,6 +131,9 @@ TestingCompositorSupport::createSolidColorScrollbarLayer(
   return nullptr;
 }
 
+TestingPlatformMockScheduler::TestingPlatformMockScheduler() {}
+TestingPlatformMockScheduler::~TestingPlatformMockScheduler() {}
+
 TestingPlatformSupport::TestingPlatformSupport()
     : TestingPlatformSupport(TestingPlatformSupport::Config()) {}