Adds Lo-Fi fallback support for new Data Reduction Proxy protocol.

content/renderer/render_frame_impl.cc

 // Copyright 2013 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.
 
 #include "content/renderer/render_frame_impl.h"
 
 #include <map>
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 115 matching lines @@
 #include "content/renderer/media/web_media_element_source_utils.h"
 #include "content/renderer/media/webmediaplayer_ms.h"
 #include "content/renderer/mojo/blink_connector_js_wrapper.h"
 #include "content/renderer/mojo/blink_interface_registry_impl.h"
 #include "content/renderer/mojo/interface_provider_js_wrapper.h"
 #include "content/renderer/mojo_bindings_controller.h"
 #include "content/renderer/navigation_state_impl.h"
 #include "content/renderer/pepper/pepper_audio_controller.h"
 #include "content/renderer/pepper/plugin_instance_throttler_impl.h"
 #include "content/renderer/presentation/presentation_dispatcher.h"
+#include "content/renderer/previews_state_helper.h"
 #include "content/renderer/push_messaging/push_messaging_client.h"
 #include "content/renderer/render_frame_proxy.h"
 #include "content/renderer/render_process.h"
 #include "content/renderer/render_thread_impl.h"
 #include "content/renderer/render_view_impl.h"
 #include "content/renderer/render_widget_fullscreen_pepper.h"
 #include "content/renderer/renderer_blink_platform_impl.h"
 #include "content/renderer/renderer_webapplicationcachehost_impl.h"
 #include "content/renderer/renderer_webcolorchooser_impl.h"
 #include "content/renderer/savable_resources.h"
@@ skipping 3692 matching lines @@
       DocumentState::FromDataSource(frame_->DataSource());
   NavigationStateImpl* navigation_state =
       static_cast<NavigationStateImpl*>(document_state->navigation_state());
   const WebURLResponse& web_url_response = frame_->DataSource()->GetResponse();
   WebURLResponseExtraDataImpl* extra_data =
       GetExtraDataFromResponse(web_url_response);
   // Only update the PreviewsState and effective connection type states for new
   // main frame documents. Subframes inherit from the main frame and should not
   // change at commit time.
   if (is_main_frame_ && !navigation_state->WasWithinSameDocument()) {
-    previews_state_ =
-        extra_data ? extra_data->previews_state() : PREVIEWS_OFF;
-
+    previews_state_ = PREVIEWS_OFF;
     if (extra_data) {
+      previews_state_ = UpdatePreviewsStateFromMainFrameResponse(
+          extra_data->previews_state(), web_url_response);
       effective_connection_type_ =
           EffectiveConnectionTypeToWebEffectiveConnectionType(
               extra_data->effective_connection_type());
     }
   }
 
   if (proxy_routing_id_ != MSG_ROUTING_NONE) {
     // If this is a provisional frame associated with a proxy (i.e., a frame
     // created for a remote-to-local navigation), swap it into the frame tree
     // now.
@@ skipping 3317 matching lines @@
       policy(info.default_policy),
       replaces_current_history_item(info.replaces_current_history_item),
       history_navigation_in_new_child_frame(
           info.is_history_navigation_in_new_child_frame),
       client_redirect(info.is_client_redirect),
       cache_disabled(info.is_cache_disabled),
       form(info.form),
       source_location(info.source_location) {}
 
 }  // namespace content