[chromedriver] Support clicking an element in sub frames.

chrome/test/chromedriver/session.cc

Index: chrome/test/chromedriver/session.cc
diff --git a/chrome/test/chromedriver/session.cc b/chrome/test/chromedriver/session.cc
index a442cca568413edfeabf65b8f570e79f17229a3d..fd039b8c100c1150893a4098e516ccba12c54b45 100644
--- a/chrome/test/chromedriver/session.cc
+++ b/chrome/test/chromedriver/session.cc
@@ -12,6 +12,13 @@
 #include "chrome/test/chromedriver/version.h"
 #include "chrome/test/chromedriver/web_view.h"
 
+FrameInfo::FrameInfo(const std::string& parent_frame_id,
+                     const std::string& frame_id,
+                     const std::string& chromedriver_frame_id)
+    : parent_frame_id(parent_frame_id),
+      frame_id(frame_id),
+      chromedriver_frame_id(chromedriver_frame_id) {}
+
 Session::Session(const std::string& id)
     : id(id),
       mouse_position(0, 0),
@@ -51,6 +58,24 @@ Status Session::GetTargetWindow(WebView** web_view) {
   return Status(kNoSuchWindow, "target window already closed");
 }
 
+void Session::SwitchToTopFrame() {
+  frames.clear();
+}
+
+void Session::SwitchToSubFrame(const std::string& frame_id,
+                               const std::string& chromedriver_frame_id) {
+  std::string parent_frame_id;
+  if (!frames.empty())
+    parent_frame_id = frames.back().frame_id;
+  frames.push_back(FrameInfo(parent_frame_id, frame_id, chromedriver_frame_id));
+}
+
+std::string Session::GetCurrentFrameId() const {
+  if (frames.empty())
+    return "";
+  return frames.back().frame_id;
+}
+
 scoped_ptr<base::DictionaryValue> Session::CreateCapabilities() {
   scoped_ptr<base::DictionaryValue> caps(new base::DictionaryValue());
   caps->SetString("browserName", "chrome");