NOT YET READY: UMA recording the kind of target frame when extensions pierce browsing instance.

extensions/renderer/extension_frame_helper.cc

Index: extensions/renderer/extension_frame_helper.cc
diff --git a/extensions/renderer/extension_frame_helper.cc b/extensions/renderer/extension_frame_helper.cc
index 6a91e015b28e65a673f9ba84220d35c67f76394c..1bffa4af3a26c9092ef60dfc4098421578c9c813 100644
--- a/extensions/renderer/extension_frame_helper.cc
+++ b/extensions/renderer/extension_frame_helper.cc
@@ -161,8 +161,31 @@ content::RenderFrame* ExtensionFrameHelper::FindFrame(
             helper->render_frame()->GetWebFrame()->GetSecurityOrigin()))
       continue;
 
-    if (helper->render_frame()->GetWebFrame()->AssignedName().Utf8() == name)
+    if (helper->render_frame()->GetWebFrame()->AssignedName().Utf8() == name) {
+      UMA_HISTOGRAM_ENUMERATION(
+          "Extensions.BrowsingInstanceViolation.ExtensionViewType",
+          helper->view_type(), VIEW_TYPE_LAST);
+
+      GURL effective_target_url = ScriptContext::GetEffectiveDocumentURL(
+          helper->render_frame()->GetWebFrame(),
+          helper->render_frame()->GetWebFrame()->GetDocument().Url(), true);
+      const Extension* target_extension =
+          extensions::RendererExtensionRegistry::Get()->GetExtensionOrAppByURL(
+              effective_target_url);
+      UMA_HISTOGRAM_ENUMERATION(
+          "Extensions.BrowsingInstanceViolation.ExtensionType",
+          target_extension->GetType(), Manifest::TYPE_MAX);
+
+      // DO NOT SUBMIT - remove the ad-hoc logging before landing this CL.  The
+      // log just shows that the UMA recording code is getting hit (despite
+      // seeing no samples via base::HistogramTester in the browser test).
+      LOG(ERROR) << "ExtensionFrameHelper::FindFrame"
+                 << "; target_extension->GetType() = "
+                 << target_extension->GetType()
+                 << "; helper->view_type() = " << helper->view_type();
+
       return helper->render_frame();
+    }
   }
 
   return nullptr;