DevTools: disable input event processing while auditing with lighthouse.

third_party/WebKit/Source/devtools/front_end/audits2/Audits2Panel.js

Index: third_party/WebKit/Source/devtools/front_end/audits2/Audits2Panel.js
diff --git a/third_party/WebKit/Source/devtools/front_end/audits2/Audits2Panel.js b/third_party/WebKit/Source/devtools/front_end/audits2/Audits2Panel.js
index f51736d6581de3ee20faf39d198d8b7d69d0d50e..1622bb303dfc206db2017b5a8c80bf02c7b11c3a 100644
--- a/third_party/WebKit/Source/devtools/front_end/audits2/Audits2Panel.js
+++ b/third_party/WebKit/Source/devtools/front_end/audits2/Audits2Panel.js
@@ -404,6 +404,8 @@ Audits2.ProtocolService = class extends Common.Object {
   attach() {
     return SDK.targetManager.interceptMainConnection(this._dispatchProtocolMessage.bind(this)).then(rawConnection => {
       this._rawConnection = rawConnection;
+      this._rawConnection.sendMessage(
+          JSON.stringify({id: 0, method: 'Input.setIgnoreInputEvents', params: {ignore: true}}));
     });
   }