Revert of Remove about:srcdoc url conversion.

chrome/browser/extensions/api/web_navigation/web_navigation_api.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Implements the Chrome Extensions WebNavigation API.
 
 #include "chrome/browser/extensions/api/web_navigation/web_navigation_api.h"
 
 #include "base/lazy_instance.h"
 #include "chrome/browser/chrome_notification_types.h"
@@ skipping 302 matching lines @@
   // that weren't reguarly loaded.
   if (!navigation_state_.IsValidFrame(render_frame_host))
     return;
 
   navigation_state_.SetDocumentLoadCompleted(render_frame_host);
   if (!navigation_state_.CanSendEvents(render_frame_host))
     return;
 
   // A new navigation might have started before the old one completed.
   // Ignore the old navigation completion in that case.
-  if (navigation_state_.GetUrl(render_frame_host) != validated_url)
+  // srcdoc iframes will report a url of about:blank, still let it through.
+  if (navigation_state_.GetUrl(render_frame_host) != validated_url &&
+      (navigation_state_.GetUrl(render_frame_host) !=
+           content::kAboutSrcDocURL ||
+       validated_url != url::kAboutBlankURL)) {
     return;
+  }
 
   // The load might already have finished by the time we finished parsing. For
   // compatibility reasons, we artifically delay the load completed signal until
   // after parsing was completed.
   if (!navigation_state_.GetParsingFinished(render_frame_host))
     return;
   helpers::DispatchOnCompleted(web_contents(),
                                render_frame_host,
                                navigation_state_.GetUrl(render_frame_host));
 }
@@ skipping 52 matching lines @@
 }
 
 void WebNavigationTabObserver::HandleCommit(
     content::NavigationHandle* navigation_handle) {
   bool is_reference_fragment_navigation = IsReferenceFragmentNavigation(
       navigation_handle->GetRenderFrameHost(), navigation_handle->GetURL());
 
   navigation_state_.StartTrackingDocumentLoad(
       navigation_handle->GetRenderFrameHost(), navigation_handle->GetURL(),
       navigation_handle->IsSamePage(),
-      false);  // is_error_page
+      false,  // is_error_page
+      navigation_handle->IsSrcdoc());
 
   events::HistogramValue histogram_value = events::UNKNOWN;
   std::string event_name;
   if (is_reference_fragment_navigation) {
     histogram_value = events::WEB_NAVIGATION_ON_REFERENCE_FRAGMENT_UPDATED;
     event_name = web_navigation::OnReferenceFragmentUpdated::kEventName;
   } else if (navigation_handle->IsSamePage()) {
     histogram_value = events::WEB_NAVIGATION_ON_HISTORY_STATE_UPDATED;
     event_name = web_navigation::OnHistoryStateUpdated::kEventName;
   } else {
     histogram_value = events::WEB_NAVIGATION_ON_COMMITTED;
     event_name = web_navigation::OnCommitted::kEventName;
   }
   helpers::DispatchOnCommitted(histogram_value, event_name, navigation_handle);
 }
 
 void WebNavigationTabObserver::HandleError(
     content::NavigationHandle* navigation_handle) {
   if (navigation_handle->HasCommitted()) {
     navigation_state_.StartTrackingDocumentLoad(
         navigation_handle->GetRenderFrameHost(), navigation_handle->GetURL(),
         navigation_handle->IsSamePage(),
-        true);  // is_error_page
+        true,  // is_error_page
+        navigation_handle->IsSrcdoc());
   }
 
   helpers::DispatchOnErrorOccurred(navigation_handle);
 }
 
 // See also NavigationController::IsURLInPageNavigation.
 bool WebNavigationTabObserver::IsReferenceFragmentNavigation(
     content::RenderFrameHost* render_frame_host,
     const GURL& url) {
   GURL existing_url = navigation_state_.GetUrl(render_frame_host);
@@ skipping 122 matching lines @@
   return g_factory.Pointer();
 }
 
 void WebNavigationAPI::OnListenerAdded(const EventListenerInfo& details) {
   web_navigation_event_router_.reset(new WebNavigationEventRouter(
       Profile::FromBrowserContext(browser_context_)));
   EventRouter::Get(browser_context_)->UnregisterObserver(this);
 }
 
 }  // namespace extensions