Adds scroll position/scale emulation to DevTools.

content/browser/devtools/protocol/emulation_handler.h

Index: content/browser/devtools/protocol/emulation_handler.h
diff --git a/content/browser/devtools/protocol/emulation_handler.h b/content/browser/devtools/protocol/emulation_handler.h
index e61862e66a7492a3697a5ebef1cad6c6fc01eacd..93e210ab12de10f5103d95ce52f81bcb818f4cac 100644
--- a/content/browser/devtools/protocol/emulation_handler.h
+++ b/content/browser/devtools/protocol/emulation_handler.h
@@ -52,7 +52,14 @@ class EmulationHandler {
       const int* screen_height,
       const int* position_x,
       const int* position_y,
-      const std::unique_ptr<base::DictionaryValue>& screen_orientation);
+      const std::unique_ptr<base::DictionaryValue>& screen_orientation,
+      const int* scroll_position_x,
+      const int* scroll_position_y,
+      const int* visual_viewport_width,
+      const int* visual_viewport_height,
+      const double* visual_viewport_position_x,
+      const double* visual_viewport_position_y,
+      const double* visual_viewport_scale);
   Response ClearDeviceMetricsOverride();
 
  private: