Fix for PDF menu should not come when mouse pointer is on the scrollbar.

pdf/instance.h

 // Copyright (c) 2012 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 PDF_INSTANCE_H_
 #define PDF_INSTANCE_H_
 
 #include <queue>
 #include <set>
 #include <string>
@@ skipping 182 matching lines @@
                                pp::Var* exception);
 
   // PreviewModeClient::Client implementation.
   virtual void PreviewDocumentLoadComplete() override;
   virtual void PreviewDocumentLoadFailed() override;
 
   // Helper functions for implementing PPP_PDF.
   void RotateClockwise();
   void RotateCounterclockwise();
 
+  // Helper function to inform when mouse pointer is on scrollbar, returns true
+  // when mouse is on vertical or horizaontal scrollbar else returns false.
+  bool IsMouseOnScrollbar(const pp::InputEvent& event);
+
  private:
   // Called whenever the plugin geometry changes to update the location of the
   // scrollbars, background parts, and notifies the pdf engine.
   void OnGeometryChanged(double old_zoom, float old_device_scale);
 
   // Runs the given JS callback given in |callback|.
   void RunCallback(int32_t, pp::Var callback);
 
   void CreateHorizontalScrollbar();
   void CreateVerticalScrollbar();
@@ skipping 312 matching lines @@
                        const std::vector<pp::Var>& args,
                        pp::Var* exception);
 
  private:
   Instance* instance_;
 };
 
 }  // namespace chrome_pdf
 
 #endif  // PDF_INSTANCE_H_