Make it possible for downstream projects to easily set the default fill color

third_party/WebKit/public/web/WebSettings.h

Index: third_party/WebKit/public/web/WebSettings.h
diff --git a/third_party/WebKit/public/web/WebSettings.h b/third_party/WebKit/public/web/WebSettings.h
index 21360081b64166acbbeebe0ec8693baeefb537c3..fe7f02864be8b82a45f09e39bb1446d6c06ba013 100644
--- a/third_party/WebKit/public/web/WebSettings.h
+++ b/third_party/WebKit/public/web/WebSettings.h
@@ -32,6 +32,7 @@
 #define WebSettings_h
 
 #include "../platform/PointerProperties.h"
+#include "../platform/WebColor.h"
 #include "../platform/WebCommon.h"
 #include "../platform/WebSize.h"
 #include "../platform/WebViewportStyle.h"
@@ -279,6 +280,7 @@ public:
     virtual void setWebSecurityEnabled(bool) = 0;
     virtual void setWideViewportQuirkEnabled(bool) = 0;
     virtual void setXSSAuditorEnabled(bool) = 0;
+    virtual void setDefaultBackgroundColor(WebColor) = 0;
 
 protected:
     ~WebSettings() { }