Show Ajax requests in performance bar

But first, rewrite the performance bar in Vue:

1. Remove the peek-host gem and replace it with existing code. This also allows
   us to include the host in the JSON response, rather than in the page HTML.
2. Leave the line profiler parts as here-be-dragons: nicer would be a separate
   endpoint for these, so we could use them on Ajax requests too.
3. The performance bar is too fiddly to rewrite right now, so apply the same
   logic to that.

Then, add features! All requests made through Axios are able to be tracked. To
keep a lid on memory usage, only the first two requests for a given URL are
tracked, though. Each request that's tracked has the same data as the initial
page load, with the exception of the performance bar and the line profiler, as
explained above.

1 files changed, 5 insertions, 5 deletions

diff --git a/spec/features/user_can_display_performance_bar_spec.rb b/spec/features/user_can_display_performance_bar_spec.rb
index 975c157bcf5..e069c2fddd1 100644
--- a/spec/features/user_can_display_performance_bar_spec.rb
+++ b/spec/features/user_can_display_performance_bar_spec.rb
@@ -3,7 +3,7 @@ require 'rails_helper'
 describe 'User can display performance bar', :js do
   shared_examples 'performance bar cannot be displayed' do
     it 'does not show the performance bar by default' do
-      expect(page).not_to have_css('#peek')
+      expect(page).not_to have_css('#js-peek')
     end
 
     context 'when user press `pb`' do
@@ -12,14 +12,14 @@ describe 'User can display performance bar', :js do
       end
 
       it 'does not show the performance bar by default' do
-        expect(page).not_to have_css('#peek')
+        expect(page).not_to have_css('#js-peek')
       end
     end
   end
 
   shared_examples 'performance bar can be displayed' do
     it 'does not show the performance bar by default' do
-      expect(page).not_to have_css('#peek')
+      expect(page).not_to have_css('#js-peek')
     end
 
     context 'when user press `pb`' do
@@ -28,7 +28,7 @@ describe 'User can display performance bar', :js do
       end
 
       it 'shows the performance bar' do
-        expect(page).to have_css('#peek')
+        expect(page).to have_css('#js-peek')
       end
     end
   end
@@ -41,7 +41,7 @@ describe 'User can display performance bar', :js do
     it 'shows the performance bar by default' do
       refresh # Because we're stubbing Rails.env after the 1st visit to root_path
 
-      expect(page).to have_css('#peek')
+      expect(page).to have_css('#js-peek')
     end
   end