[chromedriver] Add Network Conditions Override Manager and tests

chrome/test/chromedriver/window_commands.h

Index: chrome/test/chromedriver/window_commands.h
diff --git a/chrome/test/chromedriver/window_commands.h b/chrome/test/chromedriver/window_commands.h
index 612906e2ca1a314eed71b75eebcd9e1b9da9032c..67d9ff88f5f42d495c90167d3069b63339bb9cc0 100644
--- a/chrome/test/chromedriver/window_commands.h
+++ b/chrome/test/chromedriver/window_commands.h
@@ -290,6 +290,12 @@ Status ExecuteSetLocation(
     const base::DictionaryValue& params,
     scoped_ptr<base::Value>* value);
 
+Status ExecuteSetNetworkConditions(
+    Session* session,
+    WebView* web_view,
+    const base::DictionaryValue& params,
+    scoped_ptr<base::Value>* value);
+
 Status ExecuteTakeHeapSnapshot(
     Session* session,
     WebView* web_view,