Adding MimeHandlerView.

chrome/browser/guest_view/web_view/web_view_guest.cc

Index: chrome/browser/guest_view/web_view/web_view_guest.cc
diff --git a/chrome/browser/guest_view/web_view/web_view_guest.cc b/chrome/browser/guest_view/web_view/web_view_guest.cc
index 77e367615c51027aa6a21383f67c42b61c567dbc..d15db55c6345c19190f6d71a58a8cca033608483 100644
--- a/chrome/browser/guest_view/web_view/web_view_guest.cc
+++ b/chrome/browser/guest_view/web_view/web_view_guest.cc
@@ -392,13 +392,20 @@ void WebViewGuest::CreateWebContents(
   }
   std::string url_encoded_partition = net::EscapeQueryParamValue(
       storage_partition_id, false);
+  std::string emburl;
+  if (!create_params.GetString("emburl", &emburl)) {
+    emburl = embedder_extension_id;
+  } else {
+    printf("Found emburl: %s\n", emburl.c_str());
+  }
   // The SiteInstance of a given webview tag is based on the fact that it's
   // a guest process in addition to which platform application the tag
   // belongs to and what storage partition is in use, rather than the URL
   // that the tag is being navigated to.
   GURL guest_site(base::StringPrintf("%s://%s/%s?%s",
                                      content::kGuestScheme,
-                                     embedder_extension_id.c_str(),
+                                     //embedder_extension_id.c_str(),
+                                     emburl.c_str(),
                                      persist_storage ? "persist" : "",
                                      url_encoded_partition.c_str()));
 
@@ -1082,6 +1089,7 @@ void WebViewGuest::DocumentLoadedInFrame(
 bool WebViewGuest::OnMessageReceived(const IPC::Message& message,
                                      RenderFrameHost* render_frame_host) {
   bool handled = true;
+  printf("+++++ %s\n", __PRETTY_FUNCTION__);
   IPC_BEGIN_MESSAGE_MAP(WebViewGuest, message)
     IPC_MESSAGE_HANDLER(ChromeViewHostMsg_UpdateFrameName, OnUpdateFrameName)
     IPC_MESSAGE_UNHANDLED(handled = false)
@@ -1153,7 +1161,7 @@ void WebViewGuest::PushWebViewStateToIOThread() {
     NOTREACHED();
     return;
   }
-  DCHECK(embedder_extension_id() == partition_domain);
+  //DCHECK(embedder_extension_id() == partition_domain);
 
   WebViewRendererState::WebViewInfo web_view_info;
   web_view_info.embedder_process_id = embedder_render_process_id();
@@ -1645,7 +1653,7 @@ void WebViewGuest::DestroyUnattachedWindows() {
 
 GURL WebViewGuest::ResolveURL(const std::string& src) {
   if (!in_extension()) {
-    NOTREACHED();
+    //NOTREACHED();
     return GURL(src);
   }