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

pdf/instance.h

Index: pdf/instance.h
diff --git a/pdf/instance.h b/pdf/instance.h
index fe794723d1dc79aa465f04eabe4ed834529fc617..e5c2c5d1cbe9779a8acbdaacac921151302546cb 100644
--- a/pdf/instance.h
+++ b/pdf/instance.h
@@ -200,6 +200,10 @@ class Instance : public pp::InstancePrivate,
   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.