Fix for WebView accessible resources.

extensions/renderer/dispatcher.cc

Index: extensions/renderer/dispatcher.cc
diff --git a/extensions/renderer/dispatcher.cc b/extensions/renderer/dispatcher.cc
index 34324e2be1bf10a27c375337e720fd03c5a85029..5804d31f143ae946a83af3b4007e7743cf073c5b 100644
--- a/extensions/renderer/dispatcher.cc
+++ b/extensions/renderer/dispatcher.cc
@@ -840,6 +840,8 @@ bool Dispatcher::OnControlMessageReceived(const IPC::Message& message) {
   IPC_MESSAGE_HANDLER(ExtensionMsg_SetScriptingWhitelist,
                       OnSetScriptingWhitelist)
   IPC_MESSAGE_HANDLER(ExtensionMsg_SetSystemFont, OnSetSystemFont)
+  IPC_MESSAGE_HANDLER(ExtensionMsg_SetWebViewPartitionID,
+                      OnSetWebViewPartitionID)
   IPC_MESSAGE_HANDLER(ExtensionMsg_ShouldSuspend, OnShouldSuspend)
   IPC_MESSAGE_HANDLER(ExtensionMsg_Suspend, OnSuspend)
   IPC_MESSAGE_HANDLER(ExtensionMsg_TransferBlobs, OnTransferBlobs)
@@ -1054,6 +1056,14 @@ void Dispatcher::OnSetSystemFont(const std::string& font_family,
   system_font_size_ = font_size;
 }
 
+void Dispatcher::OnSetWebViewPartitionID(const std::string& partition_id) {
+  // |webview_partition_id_| cannot be changed once set.
+  DCHECK(webview_partition_id_.empty() ||

[not at google - send to devlin, 2015/09/03 20:17:54]

Make this a CHECK, then you don't need the extra "if
(webview_partition_id_.empty())" guard. just

CHECK(webview_partition_id_.empty() || webview_partition_id_ == id);
webview_partition_id_ = id;

[paulmeyer, 2015/09/08 18:51:36]

Done.

+         webview_partition_id_ == partition_id);
+  if (webview_partition_id_.empty())
+    webview_partition_id_ = partition_id;
+}
+
 void Dispatcher::OnShouldSuspend(const std::string& extension_id,
                                  uint64 sequence_id) {
   RenderThread::Get()->Send(