[Extensions] Expand bindings access checks

extensions/renderer/object_backed_native_handler.cc

Index: extensions/renderer/object_backed_native_handler.cc
diff --git a/extensions/renderer/object_backed_native_handler.cc b/extensions/renderer/object_backed_native_handler.cc
index 3ddf62222f39fc64ad355486db9fed6f9a15c602..e0c31078b0396d65cc53fd6ff62f06168da4b0e1 100644
--- a/extensions/renderer/object_backed_native_handler.cc
+++ b/extensions/renderer/object_backed_native_handler.cc
@@ -73,10 +73,14 @@ void ObjectBackedNativeHandler::Router(
     std::string feature_name = *v8::String::Utf8Value(feature_name_string);
     // TODO(devlin): Eventually, we should fail if either script_context is null
     // or feature_name is empty.
-    if (script_context &&
-        !feature_name.empty() &&
-        !script_context->GetAvailability(feature_name).is_available()) {
-      return;
+    if (script_context && !feature_name.empty()) {
+      Feature::Availability availability =
+          script_context->GetAvailability(feature_name);
+      if (!availability.is_available()) {
+        DVLOG(1) << feature_name
+                 << " is not available: " << availability.message();
+        return;
+      }

[asargent_no_longer_on_chrome, 2016/04/11 17:30:14]

Did you intend for this to get checked in or were you just using this for local
testing/development?

[Devlin, 2016/04/13 19:51:26]

I wanted to check this one in (I think DVLOG is okay - locally I go straight to
LOG(WARNING) ;)).  It's useful information for debugging, and shouldn't clutter
the console, since it shouldn't likely be hit.

[asargent_no_longer_on_chrome, 2016/04/13 23:02:40]

Ok, just wasn't sure since a checked-in DVLOG is mostly only useful for local
builds. If this is something you foresee using a lot, I can see how having it
checked in is better than having to carry the patch around and always
re-applying it (eg via a git stash or whatever) and remembering to remove it
when uploading CLs. 

     }
   }
   // This CHECK is *important*. Otherwise, we'll go around happily executing