PlzNavigate: add DumpWithoutCrashing for invalid main resource request.

content/child/web_url_loader_impl.cc

Index: content/child/web_url_loader_impl.cc
diff --git a/content/child/web_url_loader_impl.cc b/content/child/web_url_loader_impl.cc
index 3b5126aea04bd0e021f38aba6e4f2318b8745f87..7d9d2c9f0c47500101e72e8d8a55a584493ef602 100644
--- a/content/child/web_url_loader_impl.cc
+++ b/content/child/web_url_loader_impl.cc
@@ -13,6 +13,7 @@
 #include <vector>
 
 #include "base/bind.h"
+#include "base/debug/dump_without_crashing.h"
 #include "base/files/file_path.h"
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
@@ -612,6 +613,16 @@ void WebURLLoaderImpl::Context::Start(const WebURLRequest& request,
     resource_request->resource_body_stream_url = stream_override_->stream_url;
   }
 
+  // PlzNavigate: Invalid renderer main resource requests are rejected by the
+  // browser. This should not happen.
+  // TODO(arthursonzogni): Remove this when the root cause for
+  // https://crbug.com/705508 is found.
+  if (IsBrowserSideNavigationEnabled() &&
+      IsResourceTypeFrame(resource_request->resource_type) &&
+      !resource_request->resource_body_stream_url.SchemeIs(url::kBlobScheme)) {
+    base::debug::DumpWithoutCrashing();
+  }
+
   const RequestExtraData empty_extra_data;
   const RequestExtraData* extra_data;
   if (request.getExtraData())