DevTools: network search behind the experiment

1. Disable search extension.
2. Do not show search prompt in the Network log
3. Hide serch type selection when there's no meaningful choice.

Bug: 468416
Change-Id: I461b84719a804da7bf53c94a3392d8123f9d15c5
Reviewed-on: https://chromium-review.googlesource.com/962662Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Commit-Queue: Eugene Ostroukhov <eostroukhov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543175}

third_party/WebKit/Source/devtools/front_end/network/NetworkLogView.js

@@ -166,6 +166,8 @@ Network.NetworkLogView = class extends UI.VBox {
   }
 
   _createSearchPrompt() {
+    if (!Runtime.experiments.isEnabled('networkSearch'))
+      return null;
     const text = this._searchHint.contentElement.createChild('div', 'search-button');
     text.createChild('span').textContent = ls`Search headers and response bodies for `;
     const filterString = text.createChild('strong');
@@ -1839,6 +1841,8 @@ Network.NetworkLogView = class extends UI.VBox {
   }
 
   _updateSearchPrompt() {
+    if (!Runtime.experiments.isEnabled('networkSearch'))
+      return;
     const filterString = this._filterBar.visible() ? this._textFilterUI.value() : '';
     if (filterString.length) {
       const filterBarElement = this._filterBar.element;

third_party/WebKit/Source/devtools/front_end/network/module.json

@@ -123,6 +123,7 @@
         {
             "type": "@Search.SearchScope",
             "id": "network.searchInNetwork",
+            "experiment": "networkSearch",
             "className": "Network.NetworkSearchScope",
             "title": "Network",
             "description": "Search headers and response bodies"

third_party/WebKit/Source/devtools/front_end/search/SearchView.js

@@ -78,6 +78,9 @@ Search.SearchView = class extends UI.VBox {
     this._searchScopes = new Map();
     this._defaultScope = Search.SearchView._readScopesExtenstions(this._scopesSelector, this._searchScopes);
 
+    if (this._searchScopes.size < 2)
+      this._scopesSelector.hideWidget();
+
     this._load();
     /** @type {?Search.SearchScope} */
     this._searchScope = null;