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 ce8141951a33d01c60ae6ff4b320cd437e6a992f..05f4a9f2c7c34ef1729f16821a2ae38c18ed7504 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -424,6 +424,7 @@ 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
@@ -718,6 +719,7 @@ RenderFrameImpl::RenderFrameImpl(const CreateParams& params)
       manifest_manager_(NULL),
       accessibility_mode_(AccessibilityModeOff),
       renderer_accessibility_(NULL),
+      is_lofi_(false),
       weak_factory_(this) {
   std::pair<RoutingIDFrameMap::iterator, bool> result =
       g_routing_id_frame_map.Get().insert(std::make_pair(routing_id_, this));
@@ -788,9 +790,10 @@ void RenderFrameImpl::SetWebFrame(blink::WebLocalFrame* web_frame) {
   frame_ = web_frame;
 }
 
-void RenderFrameImpl::Initialize() {
+void RenderFrameImpl::Initialize(bool is_lofi) {
   is_subframe_ = !!frame_->parent();
   is_local_root_ = !frame_->parent() || frame_->parent()->isWebRemoteFrame();
+  is_lofi_ = is_lofi;
 
 #if defined(ENABLE_PLUGINS)
   new PepperBrowserConnection(this);
@@ -1995,6 +1998,10 @@ void RenderFrameImpl::AddMessageToConsole(ConsoleMessageLevel level,
     devtools_agent_->AddMessageToConsole(level, message);
 }
 
+bool RenderFrameImpl::IsLoFiOn() {
+  return is_lofi_;
+}
+
 // blink::WebFrameClient implementation ----------------------------------------
 
 blink::WebPlugin* RenderFrameImpl::createPlugin(
@@ -2214,7 +2221,7 @@ blink::WebFrame* RenderFrameImpl::createChildFrame(
 
   // Add the frame to the frame tree and initialize it.
   parent->appendChild(web_frame);
-  child_render_frame->Initialize();
+  child_render_frame->Initialize(is_lofi_);
 
   return web_frame;
 }
@@ -2686,6 +2693,9 @@ 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_lofi_ = extra_data && extra_data->is_lofi();
 
   if (proxy_routing_id_ != MSG_ROUTING_NONE) {
     RenderFrameProxy* proxy =
@@ -3242,6 +3252,7 @@ void RenderFrameImpl::willSendRequest(
   WebString custom_user_agent;
   WebString requested_with;
   scoped_ptr<StreamOverrideParameters> stream_override;
+  LoFiState lofi_state = LOFI_DEFAULT;
   if (request.extraData()) {
     RequestExtraData* old_extra_data =
         static_cast<RequestExtraData*>(request.extraData());
@@ -3262,6 +3273,7 @@ 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
@@ -3345,6 +3357,14 @@ 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_lofi_ ? LOFI_ON : LOFI_OFF);
   request.setExtraData(extra_data);
 
   // TODO(creis): Update prefetching to work with out-of-process iframes.