Allow disabling input throttle through RendererPreference (for Browser Plugin guests)

content/public/common/renderer_preferences.h

Index: content/public/common/renderer_preferences.h
diff --git a/content/public/common/renderer_preferences.h b/content/public/common/renderer_preferences.h
index 2fc446d4804e395eb71e6b3fbf4ce22cbe8cb890..4c3b8cffa5a8e4e9fd147d75db82c0df6a29c140 100644
--- a/content/public/common/renderer_preferences.h
+++ b/content/public/common/renderer_preferences.h
@@ -101,6 +101,9 @@ struct CONTENT_EXPORT RendererPreferences {
   // The user agent given to WebKit when it requests one and the user agent is
   // being overridden for the current navigation.
   std::string user_agent_override;
+
+  // Specifies whether renderer input event throttle is enabled.
+  bool throttle_input_events;
 };
 
 }  // namespace content