Add more ResourceLoaderTests

content/browser/loader/test_resource_handler.h

Index: content/browser/loader/test_resource_handler.h
diff --git a/content/browser/loader/test_resource_handler.h b/content/browser/loader/test_resource_handler.h
index 08b172eb1e41d35cc99e562abe56ddf38a7feeb8..cadbbf06d672670d10d1df49f3ae43687c0ef35d 100644
--- a/content/browser/loader/test_resource_handler.h
+++ b/content/browser/loader/test_resource_handler.h
@@ -146,6 +146,9 @@ class TestResourceHandler : public ResourceHandler {
   const std::string& body() const { return body_; }
   net::URLRequestStatus final_status() const { return final_status_; }
 
+  // Returns the current number of |this|'s methods on the callstack.
+  int call_depth() const { return call_depth_; }
+
   // Spins the message loop until the request is deferred.  Using this is
   // optional, but if used, must use it exclusively to wait for the request. If
   // the request was deferred and then resumed/canceled without calling this
@@ -198,6 +201,9 @@ class TestResourceHandler : public ResourceHandler {
       net::URLRequestStatus::FromError(net::ERR_UNEXPECTED);
   bool canceled_ = false;
 
+  // Tracks recursive calls, which aren't allowed.
+  int call_depth_ = 0;
+
   std::unique_ptr<base::RunLoop> deferred_run_loop_;
 
   base::RunLoop response_complete_run_loop_;