Alias the url for webui code with network service to get more information in debugging the crash.

Bug: 891074
Change-Id: I8904c8d0285b8b2f245456509d88206f4789fc8d
Reviewed-on: https://chromium-review.googlesource.com/c/1330064Reviewed-by: Reilly Grant <reillyg@chromium.org>
Commit-Queue: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606965}

content/browser/webui/web_ui_url_loader_factory.cc

@@ -7,6 +7,7 @@
 #include <map>
 
 #include "base/bind.h"
+#include "base/debug/alias.h"
 #include "base/debug/crash_logging.h"
 #include "base/lazy_instance.h"
 #include "base/logging.h"
@@ -57,9 +58,12 @@ void CallOnError(network::mojom::URLLoaderClientPtrInfo client_info,
 void ReadData(scoped_refptr<network::ResourceResponse> headers,
               const ui::TemplateReplacements* replacements,
               bool gzipped,
+              const GURL& url,
               scoped_refptr<URLDataSourceImpl> data_source,
               network::mojom::URLLoaderClientPtrInfo client_info,
               scoped_refptr<base::RefCountedMemory> bytes) {
+  // TODO(jam): remove after https://crbug.com/891074 is fixed.
+  DEBUG_ALIAS_FOR_GURL(url_buf, url);
   if (!bytes) {
     CallOnError(std::move(client_info), net::ERR_FAILED);
     return;
@@ -127,6 +131,7 @@ void ReadData(scoped_refptr<network::ResourceResponse> headers,
 void DataAvailable(scoped_refptr<network::ResourceResponse> headers,
                    const ui::TemplateReplacements* replacements,
                    bool gzipped,
+                   const GURL& url,
                    scoped_refptr<URLDataSourceImpl> source,
                    network::mojom::URLLoaderClientPtrInfo client_info,
                    scoped_refptr<base::RefCountedMemory> bytes) {
@@ -137,7 +142,7 @@ void DataAvailable(scoped_refptr<network::ResourceResponse> headers,
       {base::TaskPriority::USER_BLOCKING, base::MayBlock(),
        base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN})
       ->PostTask(FROM_HERE,
-                 base::BindOnce(ReadData, headers, replacements, gzipped,
+                 base::BindOnce(ReadData, headers, replacements, gzipped, url,
                                 source, std::move(client_info), bytes));
 }
 
@@ -193,6 +198,7 @@ void StartURLLoader(const network::ResourceRequest& request,
   // |replacements| is owned by |source| keep a reference to it in the callback.
   auto data_available_callback =
       base::Bind(DataAvailable, resource_response, replacements, gzipped,
+                 request.url,
                  base::RetainedRef(source), base::Passed(&client_info));
 
   // TODO(jam): once we only have this code path for WebUI, and not the