[chromedriver] Add Network Conditions Override Manager and tests

chrome/test/chromedriver/chrome/stub_web_view.cc

Index: chrome/test/chromedriver/chrome/stub_web_view.cc
diff --git a/chrome/test/chromedriver/chrome/stub_web_view.cc b/chrome/test/chromedriver/chrome/stub_web_view.cc
index 8ba6c7c5a2a61f8461038bed232b5674faac8ec9..12c6eeea7492c5dcdb5dac5a469d86179d138c5a 100644
--- a/chrome/test/chromedriver/chrome/stub_web_view.cc
+++ b/chrome/test/chromedriver/chrome/stub_web_view.cc
@@ -121,6 +121,11 @@ Status StubWebView::OverrideGeolocation(const Geoposition& geoposition) {
   return Status(kOk);
 }
 
+Status StubWebView::OverrideNetworkConditions(
+    const NetworkConditions& network_conditions) {
+  return Status(kOk);
+}
+
 Status StubWebView::CaptureScreenshot(std::string* screenshot) {
   return Status(kOk);
 }