PlzNavigate: Support data urls

content/browser/frame_host/navigation_request.h

 // Copyright 2014 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.
 
 #ifndef CONTENT_BROWSER_FRAME_HOST_NAVIGATION_REQUEST_H_
 #define CONTENT_BROWSER_FRAME_HOST_NAVIGATION_REQUEST_H_
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 52 matching lines @@
   // Note: |body| is sent to the IO thread when calling BeginNavigation, and
   // should no longer be manipulated afterwards on the UI thread.
   static scoped_ptr<NavigationRequest> CreateRendererInitiated(
       FrameTreeNode* frame_tree_node,
       const CommonNavigationParams& common_params,
       const BeginNavigationParams& begin_params,
       scoped_refptr<ResourceRequestBody> body);
 
   ~NavigationRequest() override;
 
-  // Called on the UI thread by the Navigator to start the navigation on the IO
-  // thread.
+  // Called on the UI thread by the Navigator to start the navigation. Returns
+  // whether a request was made on the IO thread.
   // TODO(clamy): see if ResourceRequestBody could be un-refcounted to avoid
   // threading subtleties.
-  void BeginNavigation();
+  bool BeginNavigation();
 
   const CommonNavigationParams& common_params() const { return common_params_; }
 
   const CommitNavigationParams& commit_params() const { return commit_params_; }
 
   NavigationURLLoader* loader_for_testing() const { return loader_.get(); }
 
   NavigationState state() const { return state_; }
 
   SiteInstanceImpl* source_site_instance() const {
@@ skipping 66 matching lines @@
   NavigationEntryImpl::RestoreType restore_type_;
   bool is_view_source_;
   int bindings_;
 
   DISALLOW_COPY_AND_ASSIGN(NavigationRequest);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_NAVIGATION_REQUEST_H_