In chromedriver, check if an element is clickable before clicking.

chrome/test/webdriver/session.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_TEST_WEBDRIVER_SESSION_H_
 #define CHROME_TEST_WEBDRIVER_SESSION_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 184 matching lines @@
                       std::vector<WebElementId>* elements);
 
   // Scroll the element into view and get its location relative to
   // the client's viewport.
   Error* GetElementLocationInView(
       const WebElementId& element,
       gfx::Point* location);
 
   // Scroll the element's region into view and get its location relative to
   // the client's viewport. If |center| is true, the element will be centered
-  // if it is too big to fit in view.
+  // if it is too big to fit in view. If |verify_clickable_at_middle| is true,
+  // an error will be returned if the element is not clickable in the middle
+  // of the given region.
   Error* GetElementRegionInView(
       const WebElementId& element,
       const gfx::Rect& region,
       bool center,
+      bool verify_clickable_at_middle,
       gfx::Point* location);
 
   // Gets the size of the element from the given window and frame, even if
   // its display is none.
   Error* GetElementSize(const FrameId& frame_id,
                         const WebElementId& element,
                         gfx::Size* size);
 
   // Gets the size of the element's first client rect. If the element has
   // no client rects, this will return an error.
@@ skipping 87 matching lines @@
   void SendKeysOnSessionThread(const string16& keys, Error** error);
   Error* SwitchToFrameWithJavaScriptLocatedFrame(
       const std::string& script,
       base::ListValue* args);
   Error* FindElementsHelper(const FrameId& frame_id,
                             const WebElementId& root_element,
                             const std::string& locator,
                             const std::string& query,
                             bool find_one,
                             std::vector<WebElementId>* elements);
+  // Returns an error if the element is not clickable.
+  Error* VerifyElementIsClickable(
+      const FrameId& frame_id,
+      const WebElementId& element,
+      const gfx::Point& location);
   Error* GetElementRegionInViewHelper(
       const FrameId& frame_id,
       const WebElementId& element,
       const gfx::Rect& region,
       bool center,
+      bool verify_clickable_at_middle,
       gfx::Point* location);
 
   const std::string id_;
   FrameId current_target_;
 
   scoped_ptr<Automation> automation_;
   base::Thread thread_;
 
   // Timeout (in ms) for asynchronous script execution.
   int async_script_timeout_;
@@ skipping 27 matching lines @@
   bool has_alert_prompt_text_;
 
   DISALLOW_COPY_AND_ASSIGN(Session);
 };
 
 }  // namespace webdriver
 
 DISABLE_RUNNABLE_METHOD_REFCOUNT(webdriver::Session);
 
 #endif  // CHROME_TEST_WEBDRIVER_SESSION_H_