Consistently use LoFi for an entire page

content/renderer/render_frame_impl.cc

Index: content/renderer/render_frame_impl.cc
diff --git a/content/renderer/render_frame_impl.cc b/content/renderer/render_frame_impl.cc
index b2e454f4cdece95127e38118fd56c6f05e9fb887..7f47344f43cabd3765e17c7e4724f56e42d0fea3 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -428,6 +428,7 @@ WebURLRequest CreateURLRequestForNavigation(
 
   RequestExtraData* extra_data = new RequestExtraData();
   extra_data->set_stream_override(stream_override.Pass());
+  extra_data->set_lofi_state(common_params.lofi_state);
   request.setExtraData(extra_data);
 
   // Set the ui timestamp for this navigation. Currently the timestamp here is
@@ -721,6 +722,7 @@ RenderFrameImpl::RenderFrameImpl(const CreateParams& params)
       manifest_manager_(NULL),
       accessibility_mode_(AccessibilityModeOff),
       renderer_accessibility_(NULL),
+      is_using_lofi_(false),
       weak_factory_(this) {
   std::pair<RoutingIDFrameMap::iterator, bool> result =
       g_routing_id_frame_map.Get().insert(std::make_pair(routing_id_, this));
@@ -795,6 +797,11 @@ void RenderFrameImpl::Initialize() {
   is_main_frame_ = !frame_->parent();
   is_local_root_ = is_main_frame_ || frame_->parent()->isWebRemoteFrame();
 
+  RenderFrameImpl* parent_frame = RenderFrameImpl::FromWebFrame(
+      frame_->parent());
+  if (parent_frame)
+    is_using_lofi_ = parent_frame->IsUsingLoFi();
+
   bool is_tracing = false;
   TRACE_EVENT_CATEGORY_GROUP_ENABLED("navigation", &is_tracing);
   if (is_tracing) {
@@ -806,8 +813,6 @@ void RenderFrameImpl::Initialize() {
         if (parent_proxy)
           parent_id = parent_proxy->routing_id();
       } else {
-        RenderFrameImpl* parent_frame = RenderFrameImpl::FromWebFrame(
-            frame_->parent());
         if (parent_frame)
           parent_id = parent_frame->GetRoutingID();
       }
@@ -2017,6 +2022,10 @@ void RenderFrameImpl::AddMessageToConsole(ConsoleMessageLevel level,
     devtools_agent_->AddMessageToConsole(level, message);
 }
 
+bool RenderFrameImpl::IsUsingLoFi() {
+  return is_using_lofi_;
+}
+
 // blink::WebFrameClient implementation ----------------------------------------
 
 blink::WebPlugin* RenderFrameImpl::createPlugin(
@@ -2716,6 +2725,9 @@ void RenderFrameImpl::didCommitProvisionalLoad(
       DocumentState::FromDataSource(frame->dataSource());
   NavigationStateImpl* navigation_state =
       static_cast<NavigationStateImpl*>(document_state->navigation_state());
+  WebURLResponseExtraDataImpl* extra_data = GetExtraDataFromResponse(
+      frame->dataSource()->response());
+  is_using_lofi_ = extra_data && extra_data->is_using_lofi();
 
   if (proxy_routing_id_ != MSG_ROUTING_NONE) {
     RenderFrameProxy* proxy =
@@ -3272,6 +3284,7 @@ void RenderFrameImpl::willSendRequest(
   WebString custom_user_agent;
   WebString requested_with;
   scoped_ptr<StreamOverrideParameters> stream_override;
+  LoFiState lofi_state = LOFI_UNSPECIFIED;
   if (request.extraData()) {
     RequestExtraData* old_extra_data =
         static_cast<RequestExtraData*>(request.extraData());
@@ -3292,6 +3305,7 @@ void RenderFrameImpl::willSendRequest(
         request.setHTTPHeaderField("X-Requested-With", requested_with);
     }
     stream_override = old_extra_data->TakeStreamOverrideOwnership();
+    lofi_state = old_extra_data->lofi_state();
   }
 
   // Add the default accept header for frame request if it has not been set
@@ -3375,6 +3389,14 @@ void RenderFrameImpl::willSendRequest(
       navigation_state->start_params().transferred_request_request_id);
   extra_data->set_service_worker_provider_id(provider_id);
   extra_data->set_stream_override(stream_override.Pass());
+  // TODO(megjablon): Set the navigation params for single image loads to
+  // LOFI_OFF and remove the dependency on ReloadBypassingCache.
+  if (request.cachePolicy() == WebURLRequest::ReloadBypassingCache)
+    extra_data->set_lofi_state(LOFI_OFF);
+  else if (!navigation_state->request_committed())
+    extra_data->set_lofi_state(lofi_state);
+  else
+    extra_data->set_lofi_state(is_using_lofi_ ? LOFI_ON : LOFI_OFF);
   request.setExtraData(extra_data);
 
   // TODO(creis): Update prefetching to work with out-of-process iframes.