[chromedriver] Add page loading strategy to capabilities

chrome/test/chromedriver/capabilities.h

Index: chrome/test/chromedriver/capabilities.h
diff --git a/chrome/test/chromedriver/capabilities.h b/chrome/test/chromedriver/capabilities.h
index c11bd4bf0c6840de5f0af1588ead892077085d6d..49a3a72bd82868a0091e84cae586ed0601407047 100644
--- a/chrome/test/chromedriver/capabilities.h
+++ b/chrome/test/chromedriver/capabilities.h
@@ -142,6 +142,8 @@ struct Capabilities {
   // If set, enable minidump for chrome crashes and save to this directory.
   std::string minidump_path;
 
+  std::string page_load_strategy;
+
   bool network_emulation_enabled;
 
   PerfLoggingPrefs perf_logging_prefs;