Adding an api to get number of event listeners.

chrome/test/chromedriver/chrome/web_view_impl.cc

Index: chrome/test/chromedriver/chrome/web_view_impl.cc
diff --git a/chrome/test/chromedriver/chrome/web_view_impl.cc b/chrome/test/chromedriver/chrome/web_view_impl.cc
index 98deccde55d7c47d450dc4b937293ff4c7e05ed4..bdc4cab93160e2deb50766eed78a719b169db094 100644
--- a/chrome/test/chromedriver/chrome/web_view_impl.cc
+++ b/chrome/test/chromedriver/chrome/web_view_impl.cc
@@ -16,6 +16,7 @@
 #include "chrome/test/chromedriver/chrome/debugger_tracker.h"
 #include "chrome/test/chromedriver/chrome/devtools_client_impl.h"
 #include "chrome/test/chromedriver/chrome/dom_tracker.h"
+#include "chrome/test/chromedriver/chrome/event_listener_count.h"
 #include "chrome/test/chromedriver/chrome/frame_tracker.h"
 #include "chrome/test/chromedriver/chrome/geolocation_override_manager.h"
 #include "chrome/test/chromedriver/chrome/heap_snapshot_taker.h"
@@ -117,6 +118,7 @@ WebViewImpl::WebViewImpl(const std::string& id,
     : id_(id),
       build_no_(build_no),
       dom_tracker_(new DomTracker(client.get())),
+      event_listener_count_(new EventListenerCount(client.get())),
       frame_tracker_(new FrameTracker(client.get())),
       navigation_tracker_(new NavigationTracker(client.get())),
       dialog_manager_(new JavaScriptDialogManager(client.get())),
@@ -416,6 +418,10 @@ Status WebViewImpl::TakeHeapSnapshot(scoped_ptr<base::Value>* snapshot) {
   return heap_snapshot_taker_->TakeSnapshot(snapshot);
 }
 
+Status WebViewImpl::GetEventListenersCount(int* count) {
+  return event_listener_count_->GetEventListenersCount(count);
+}
+
 Status WebViewImpl::CallAsyncFunctionInternal(const std::string& frame,
                                               const std::string& function,
                                               const base::ListValue& args,