Add UI test for click-to-play.

chrome/test/automation/tab_proxy.cc

Index: chrome/test/automation/tab_proxy.cc
diff --git a/chrome/test/automation/tab_proxy.cc b/chrome/test/automation/tab_proxy.cc
index d0d0426dff0d45e3836c4cb6a914a0452fed33e3..a338de706db385941dd176fdf2861756cc014c85 100644
--- a/chrome/test/automation/tab_proxy.cc
+++ b/chrome/test/automation/tab_proxy.cc
@@ -729,6 +729,15 @@ bool TabProxy::OverrideEncoding(const std::string& encoding) {
   return succeeded;
 }
 
+bool TabProxy::LoadBlockedPlugins() {
+  if (!is_valid())
+    return false;
+
+  bool succeeded = false;
+  sender_->Send(new AutomationMsg_LoadBlockedPlugins(0, handle_, &succeeded));
+  return succeeded;
+}
+
 #if defined(OS_WIN)
 void TabProxy::Reposition(HWND window, HWND window_insert_after, int left,
                           int top, int width, int height, int flags,