Add deprecation message for -webkit-background-composite

third_party/WebKit/Source/core/frame/FrameHost.cpp

Index: third_party/WebKit/Source/core/frame/FrameHost.cpp
diff --git a/third_party/WebKit/Source/core/frame/FrameHost.cpp b/third_party/WebKit/Source/core/frame/FrameHost.cpp
index fb054f70083b878cf48f337767565ffeb797d509..c51afee0c625cb5513c1248bb93f3297a82e2ff0 100644
--- a/third_party/WebKit/Source/core/frame/FrameHost.cpp
+++ b/third_party/WebKit/Source/core/frame/FrameHost.cpp
@@ -76,6 +76,11 @@ UseCounter& FrameHost::useCounter() const
     return m_page->useCounter();
 }
 
+Deprecation& FrameHost::deprecation() const
+{
+    return m_page->deprecation();
+}
+
 float FrameHost::deviceScaleFactor() const
 {
     return m_page->deviceScaleFactor();