Add temporary DumpWithoutCrashing to InitRenderFrameProxy().

This should help investigate a theory that a message to create a
RenderFrameProxy is sent when that proxy already exists in the
renderer process.

Bug: 794625
Change-Id: I2bf7dc1312dc3cbf8d307c8358ac64c8402fe875
Reviewed-on: https://chromium-review.googlesource.com/1139186Reviewed-by: Charlie Reis <creis@chromium.org>
Commit-Queue: Alex Moshchuk <alexmos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#575856}

content/browser/frame_host/render_frame_proxy_host.cc

@@ -8,6 +8,8 @@
 #include <vector>
 
 #include "base/callback.h"
+#include "base/debug/alias.h"
+#include "base/debug/dump_without_crashing.h"
 #include "base/lazy_instance.h"
 #include "content/browser/bad_message.h"
 #include "content/browser/blob_storage/chrome_blob_storage_context.h"
@@ -202,6 +204,30 @@ bool RenderFrameProxyHost::InitRenderFrameProxy() {
         site_instance_.get());
   }
 
+  // Temporary debugging code for https://crbug.com/794625 to see if we're ever
+  // sending a message to create a RenderFrameProxy when one already exists.
+  // TODO(alexmos): Remove after the investigation.
+  if (render_frame_proxy_created_) {
+    SiteInstanceImpl* site_instance =
+        static_cast<SiteInstanceImpl*>(site_instance_.get());
+    GURL site_url(site_instance->GetSiteURL());
+    DEBUG_ALIAS_FOR_GURL(site_url_copy, site_url);
+    GURL current_rfh_site_url(frame_tree_node_->render_manager()
+                                  ->current_frame_host()
+                                  ->GetSiteInstance()
+                                  ->GetSiteURL());
+    DEBUG_ALIAS_FOR_GURL(current_rfh_site_url_copy, current_rfh_site_url);
+
+    int routing_id_copy = routing_id_;
+    base::debug::Alias(&routing_id_copy);
+    int parent_routing_id_copy = parent_routing_id;
+    base::debug::Alias(&parent_routing_id_copy);
+    int active_frame_count = site_instance->active_frame_count();
+    base::debug::Alias(&active_frame_count);
+
+    base::debug::DumpWithoutCrashing();
+  }
+
   int view_routing_id = frame_tree_node_->frame_tree()
       ->GetRenderViewHost(site_instance_.get())->GetRoutingID();
   GetProcess()->GetRendererInterface()->CreateFrameProxy(