scheduler: Tell v8 about the current RAIL mode

third_party/WebKit/public/web/WebKit.h

Index: third_party/WebKit/public/web/WebKit.h
diff --git a/third_party/WebKit/public/web/WebKit.h b/third_party/WebKit/public/web/WebKit.h
index d483405287972c99c2c59c453d3e4736091eebe2..47d968403612fbaceef53c85aeb93e4c3e6216de 100644
--- a/third_party/WebKit/public/web/WebKit.h
+++ b/third_party/WebKit/public/web/WebKit.h
@@ -32,11 +32,7 @@
 #define WebKit_h
 
 #include "../platform/Platform.h"
-
-namespace v8 {
-class Isolate;
-enum class MemoryPressureLevel;
-}
+#include <v8.h>
 
 namespace blink {
 
@@ -89,6 +85,9 @@ BLINK_EXPORT void decommitFreeableMemory();
 BLINK_EXPORT void MemoryPressureNotificationToWorkerThreadIsolates(
     v8::MemoryPressureLevel);
 
+// Set the RAIL performance mode on all worker thread isolates.
+BLINK_EXPORT void setRAILModeOnWorkerThreadIsolates(v8::RAILMode);
+
 } // namespace blink
 
 #endif