Promote RenderLayers that have a transition on opacity, transform, or filter

Tools/DumpRenderTree/chromium/TestShell.cpp

Index: Tools/DumpRenderTree/chromium/TestShell.cpp
diff --git a/Tools/DumpRenderTree/chromium/TestShell.cpp b/Tools/DumpRenderTree/chromium/TestShell.cpp
index d67be24986cc741630327c7d53298c599c768ec8..f72a2ee05030057718b9c658a8b833acbcbac3ea 100644
--- a/Tools/DumpRenderTree/chromium/TestShell.cpp
+++ b/Tools/DumpRenderTree/chromium/TestShell.cpp
@@ -109,6 +109,7 @@ TestShell::TestShell()
     , m_acceleratedCompositingForVideoEnabled(false)
     , m_acceleratedCompositingForFixedPositionEnabled(false)
     , m_acceleratedCompositingForOverflowScrollEnabled(false)
+    , m_acceleratedCompositingForTransitionEnabled(false)
     , m_softwareCompositingEnabled(false)
     , m_threadedCompositingEnabled(false)
     , m_forceCompositingMode(false)
@@ -213,6 +214,7 @@ void TestShell::resetWebSettings(WebView& webView)
     m_prefs.acceleratedCompositingForVideoEnabled = m_acceleratedCompositingForVideoEnabled;
     m_prefs.acceleratedCompositingForFixedPositionEnabled = m_acceleratedCompositingForFixedPositionEnabled;
     m_prefs.acceleratedCompositingForOverflowScrollEnabled = m_acceleratedCompositingForOverflowScrollEnabled;
+    m_prefs.acceleratedCompositingForTransitionEnabled = m_acceleratedCompositingForTransitionEnabled;
     m_prefs.forceCompositingMode = m_forceCompositingMode;
     m_prefs.accelerated2dCanvasEnabled = m_accelerated2dCanvasEnabled;
     m_prefs.perTilePaintingEnabled = m_perTilePaintingEnabled;