[chromedriver] Add shadow DOM support to chromedriver.

third_party/webdriver/atoms.h

Index: third_party/webdriver/atoms.h
diff --git a/third_party/webdriver/atoms.h b/third_party/webdriver/atoms.h
index 6d91176623bf651e95ac3a868e408a0ce1c9a288..0e74b4743966c77ddfceffe086f265cd82edebc2 100644
--- a/third_party/webdriver/atoms.h
+++ b/third_party/webdriver/atoms.h
@@ -28,7 +28,6 @@ extern const char* const CLICK[];
 extern const char* const EXECUTE_ASYNC_SCRIPT[];
 extern const char* const EXECUTE_SCRIPT[];
 extern const char* const EXECUTE_SQL[];
-extern const char* const FIND_ELEMENT[];
 extern const char* const FIND_ELEMENTS[];
 extern const char* const GET_EFFECTIVE_STYLE[];
 extern const char* const GET_LOCATION[];
@@ -36,10 +35,12 @@ extern const char* const GET_SIZE[];
 extern const char* const IS_DISPLAYED[];
 extern const char* const IS_ENABLED[];
 extern const char* const SUBMIT[];
+extern const char* const FIND_ELEMENT[];
 extern const char* const GET_FIRST_CLIENT_RECT[];
 extern const char* const GET_LOCATION_IN_VIEW[];
 extern const char* const GET_PAGE_ZOOM[];
 extern const char* const IS_ELEMENT_CLICKABLE[];
+extern const char* const IS_ELEMENT_DISPLAYED[];
 extern const char* const CLEAR_LOCAL_STORAGE[];
 extern const char* const CLEAR_SESSION_STORAGE[];
 extern const char* const GET_APPCACHE_STATUS[];