Request text context in the plugin process

ppapi/shared_impl/ppb_instance_shared.h

Index: ppapi/shared_impl/ppb_instance_shared.h
diff --git a/ppapi/shared_impl/ppb_instance_shared.h b/ppapi/shared_impl/ppb_instance_shared.h
index 8260a784c016dca58cc9a70ed8da9f204d3fb967..eed82e17cd801ec8f5be66149e03330cd9666b40 100644
--- a/ppapi/shared_impl/ppb_instance_shared.h
+++ b/ppapi/shared_impl/ppb_instance_shared.h
@@ -31,8 +31,13 @@ class PPAPI_SHARED_EXPORT PPB_Instance_Shared
   int32_t ValidateRequestInputEvents(bool is_filtering, uint32_t event_classes);
 
   bool ValidateSetCursorParams(PP_MouseCursor_Type type,
-                               PP_Resource image,
-                               const PP_Point* hot_spot);
+                               PP_Resource image,
+                               const PP_Point* hot_spot);
+
+  // The length of text to request as a surrounding context of selection.
+  // For now, the value is copied from the one with render_view_impl.cc.
+  // TODO(kinaba) implement a way to dynamically sync the requirement.
+  static const int kExtraCharsForTextInput;
 };
 
 }  // namespace ppapi