UMA data collector for cross-site documents(XSD)

content/public/common/content_switches.cc

Index: content/public/common/content_switches.cc
diff --git a/content/public/common/content_switches.cc b/content/public/common/content_switches.cc
index 36f707f621d55e03fd3235ff55b1dbeb8fc9458a..51dfc72cdd2fe10f338b85e1dc1b75c433f2e168 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -41,6 +41,12 @@ const char kBlacklistAcceleratedCompositing[] =
 // Blacklist the GPU for WebGL.
 const char kBlacklistWebGL[]                = "blacklist-webgl";
 
+// Block cross-site documents (i.e., HTML/XML/JSON) from being loaded in
+// subresources when a document is not supposed to read them.  This will later
+// allow us to block them from the entire renderer process when site isolation
+// is enabled.
+const char kBlockCrossSiteDocuments[]     = "block-cross-site-documents";
+
 // Causes the browser process to throw an assertion on startup.
 const char kBrowserAssertTest[]             = "assert-test";