Fix for WebView accessible resources.

extensions/browser/renderer_startup_helper.cc

Index: extensions/browser/renderer_startup_helper.cc
diff --git a/extensions/browser/renderer_startup_helper.cc b/extensions/browser/renderer_startup_helper.cc
index 99c7b91de1cd641dc683a84ba674631b1b494dd2..17a5262dfae5dc416b6842c0bff6954e56a4afa6 100644
--- a/extensions/browser/renderer_startup_helper.cc
+++ b/extensions/browser/renderer_startup_helper.cc
@@ -12,6 +12,7 @@
 #include "extensions/browser/extension_function_dispatcher.h"
 #include "extensions/browser/extension_registry.h"
 #include "extensions/browser/extensions_browser_client.h"
+#include "extensions/browser/guest_view/web_view/web_view_guest.h"
 #include "extensions/common/extension_messages.h"
 #include "extensions/common/extension_set.h"
 #include "extensions/common/extensions_client.h"
@@ -72,6 +73,11 @@ void RendererStartupHelper::Observe(
           ExtensionMsg_Loaded_Params(ext.get(), include_tab_permissions));
     }
   }
+  std::string webview_partition_id = WebViewGuest::GetPartitionID(process);
+  if (!webview_partition_id.empty()) {
+    process->Send(new ExtensionMsg_SetWebViewPartitionID(
+        WebViewGuest::GetPartitionID(process)));
+  }

[not at google - send to devlin, 2015/08/31 21:52:51]

Take care where you put new code. In the original code, lines 59-75 are to do
with sending the ExtensionMsg_Loaded IPC, and this new code interrupts that. I'd
put it before the new code, and please comment it.

[paulmeyer, 2015/09/02 13:43:57]

Done.

   process->Send(new ExtensionMsg_Loaded(loaded_extensions));
 }