Part 1 of merges for Chromium bug #64589...

WebKit/qt/WebCoreSupport/ChromeClientQt.cpp

Index: WebKit/qt/WebCoreSupport/ChromeClientQt.cpp
===================================================================
--- WebKit/qt/WebCoreSupport/ChromeClientQt.cpp	(revision 73142)
+++ WebKit/qt/WebCoreSupport/ChromeClientQt.cpp	(working copy)
@@ -617,9 +617,12 @@
         platformPageClient()->markForSync(true);
 }
 
-bool ChromeClientQt::allowsAcceleratedCompositing() const
+ChromeClient::CompositingTriggerFlags ChromeClientQt::allowedCompositingTriggers() const
 {
-    return (platformPageClient() && platformPageClient()->allowsAcceleratedCompositing());
+    if (platformPageClient() && platformPageClient()->allowsAcceleratedCompositing())
+        return AllTriggers;
+
+    return 0;
 }
 
 #endif