Reload Lo-Fi images inline instead of reloading the whole 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 0fc35cb87d037f9f330bc1da25ca7754801db471..30ee8e4b1b1a08d7f8b9f3e5ae71cc31edc69816 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -1393,6 +1393,7 @@ bool RenderFrameImpl::OnMessageReceived(const IPC::Message& msg) {
     IPC_MESSAGE_HANDLER(FrameMsg_SetEditableSelectionOffsets,
                         OnSetEditableSelectionOffsets)
     IPC_MESSAGE_HANDLER(FrameMsg_Reload, OnReload)
+    IPC_MESSAGE_HANDLER(FrameMsg_ReloadLoFiImages, OnReloadLoFiImages)
     IPC_MESSAGE_HANDLER(FrameMsg_TextSurroundingSelectionRequest,
                         OnTextSurroundingSelectionRequest)
     IPC_MESSAGE_HANDLER(FrameMsg_SetAccessibilityMode,
@@ -2130,6 +2131,11 @@ void RenderFrameImpl::OnReload(bool ignore_cache) {
   frame_->reload(ignore_cache);
 }
 
+void RenderFrameImpl::OnReloadLoFiImages() {
+  is_using_lofi_ = false;
+  GetWebFrame()->reloadLoFiImages();
+}
+
 void RenderFrameImpl::OnTextSurroundingSelectionRequest(size_t max_length) {
   blink::WebSurroundingText surroundingText;
   surroundingText.initialize(frame_->selectionRange(), max_length);
@@ -3133,9 +3139,13 @@ 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();
+  WebURLResponseExtraDataImpl* extra_data =
+      GetExtraDataFromResponse(frame->dataSource()->response());
+  // Only update LoFi state for new main frame documents. Subframes inherit from
+  // the main frame and should not change at commit time.
+  if (is_main_frame_ && !navigation_state->WasWithinSamePage()) {
+    is_using_lofi_ = extra_data && extra_data->is_using_lofi();
+  }
 
   if (proxy_routing_id_ != MSG_ROUTING_NONE) {
     RenderFrameProxy* proxy =