[Devtools] Added Enable/Disable for request blocking in network

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

Index: third_party/WebKit/Source/devtools/front_end/network/NetworkPanel.js
diff --git a/third_party/WebKit/Source/devtools/front_end/network/NetworkPanel.js b/third_party/WebKit/Source/devtools/front_end/network/NetworkPanel.js
index e3eda70ec4c1382bcd4dd31871f89dbe12c32063..d1a825b3899c0bc6ebae7c9f165937b15e70746d 100644
--- a/third_party/WebKit/Source/devtools/front_end/network/NetworkPanel.js
+++ b/third_party/WebKit/Source/devtools/front_end/network/NetworkPanel.js
@@ -107,6 +107,27 @@ Network.NetworkPanel = class extends UI.Panel {
     this._networkLogView.addEventListener(Network.NetworkLogView.Events.UpdateRequest, this._onUpdateRequest, this);
 
     Components.DataSaverInfobar.maybeShowInPanel(this);
+
+    var manager = SDK.multitargetNetworkManager;
+    manager.on(SDK.MultitargetNetworkManager.RequestBlockingEnabledChangedEvent, updateVisibility.bind(this));
+    manager.addEventListener(SDK.MultitargetNetworkManager.Events.ConditionsChanged, updateVisibility.bind(this));
+    var blockedURLsSetting = Common.moduleSetting('networkBlockedURLs');
+    blockedURLsSetting.addChangeListener(updateVisibility.bind(this));
+
+    /**
+     * @this {Network.NetworkPanel}
+     */
+    function updateVisibility() {

[pfeldman, 2017/02/22 00:02:46]

You need to call it immediately as well - what if the setting has been already
modified.

[allada, 2017/03/03 20:14:02]

Done.

+      var icon = null;
+      if (manager.isThrottling()) {
+        icon = UI.Icon.create('smallicon-warning');
+        icon.title = Common.UIString('Network throttling is enabled');
+      } else if (SDK.multitargetNetworkManager.isRequestBlockingEnabled() && blockedURLsSetting.get().length) {
+        icon = UI.Icon.create('smallicon-warning');
+        icon.title = Common.UIString('Requests may be blocked');

[pfeldman, 2017/02/22 00:02:46]

In this case you can go even further and report the actual blockings. Otherwise
you deliver something in the middle.

[allada, 2017/03/03 20:14:02]

We report which requests are blocked in the network log itself. This is supposed
to symbolize that new requests may be blocked.

+      }
+      UI.inspectorView.setPanelIcon(this.name, icon);
+    }
   }
 
   /**