Allow huge data: URIs only via WebView.loadDataWithBaseUrl

content/common/navigation_params.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_COMMON_NAVIGATION_PARAMS_H_
 #define CONTENT_COMMON_NAVIGATION_PARAMS_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/time/time.h"
 #include "content/common/content_export.h"
 #include "content/common/frame_message_enums.h"
 #include "content/public/common/page_state.h"
 #include "content/public/common/referrer.h"
 #include "content/public/common/request_context_type.h"
 #include "ui/base/page_transition_types.h"
 #include "url/gurl.h"
 
-namespace base {
-class RefCountedMemory;
-}
-
 namespace content {
 
 // The LoFi state which determines whether to add the Lo-Fi header.
 enum LoFiState {
   // Let the browser process decide whether or not to request the Lo-Fi version.
   LOFI_UNSPECIFIED = 0,
 
   // Request a normal (non-Lo-Fi) version of the resource.
   LOFI_OFF,
 
@@ skipping 19 matching lines @@
   CommonNavigationParams(const GURL& url,
                          const Referrer& referrer,
                          ui::PageTransition transition,
                          FrameMsg_Navigate_Type::Value navigation_type,
                          bool allow_download,
                          bool should_replace_current_entry,
                          base::TimeTicks ui_timestamp,
                          FrameMsg_UILoadMetricsReportType::Value report_type,
                          const GURL& base_url_for_data_url,
                          const GURL& history_url_for_data_url,
+                         const std::string& data_url_as_string,
                          LoFiState lofi_state,
                          const base::TimeTicks& navigation_start);
   ~CommonNavigationParams();
 
   // The URL to navigate to.
   // PlzNavigate: May be modified when the navigation is ready to commit.
   GURL url;
 
   // The URL to send in the "Referer" header field. Can be empty if there is
   // no referrer.
@@ skipping 25 matching lines @@
   FrameMsg_UILoadMetricsReportType::Value report_type;
 
   // Base URL for use in Blink's SubstituteData.
   // Is only used with data: URLs.
   GURL base_url_for_data_url;
 
   // History URL for use in Blink's SubstituteData.
   // Is only used with data: URLs.
   GURL history_url_for_data_url;
 
+  // The real content of the data: URL. Used to circumvent the restriction
+  // on the GURL max length. Note that it may only be passed from browser
+  // to renderer, not vice versa.

[boliu, 2015/12/09 19:33:02]

(only read up to this point) how is renderer->browser avoided?

(after finish reading everything) Sounds like a soft guarantee. Is everything
renderer->browser constructed from MakeCommonNavigationParams in
render_frame_impl.cc?

+  std::string data_url_as_string;
+
   // Whether or not to request a LoFi version of the document or let the browser
   // decide.
   LoFiState lofi_state;
 
   // The navigationStart time exposed through the Navigation Timing API to JS.
   // If this is for a browser-initiated navigation, this can override the
   // navigation_start value in Blink.
   // PlzNavigate: For renderer initiated navigations, this will be set on the
   // renderer side and sent with FrameHostMsg_BeginNavigation.
   base::TimeTicks navigation_start;
@@ skipping 191 matching lines @@
   ~NavigationParams();
 
   CommonNavigationParams common_params;
   StartNavigationParams start_params;
   RequestNavigationParams request_params;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_NAVIGATION_PARAMS_H_