[devtools] Remove device emulation background color override.

content/browser/devtools/protocol/emulation_handler.cc

Index: content/browser/devtools/protocol/emulation_handler.cc
diff --git a/content/browser/devtools/protocol/emulation_handler.cc b/content/browser/devtools/protocol/emulation_handler.cc
index 8bb8ef29612e1c8d404759b09d83a47ba15b8065..83be4ddd1464c71009a295dd90ea824523f69a38 100644
--- a/content/browser/devtools/protocol/emulation_handler.cc
+++ b/content/browser/devtools/protocol/emulation_handler.cc
@@ -151,7 +151,8 @@ Response EmulationHandler::SetDeviceMetricsOverride(
     Maybe<int> screen_height,
     Maybe<int> position_x,
     Maybe<int> position_y,
-    Maybe<Emulation::ScreenOrientation> screen_orientation) {
+    Maybe<Emulation::ScreenOrientation> screen_orientation,
+    Maybe<bool> override_gutter_color) {
   const static int max_size = 10000000;
   const static double max_scale = 10;
   const static int max_orientation_angle = 360;
@@ -188,17 +189,17 @@ Response EmulationHandler::SetDeviceMetricsOverride(
         base::DoubleToString(max_scale));
   }
 
-  blink::WebScreenOrientationType orientationType =
+  blink::WebScreenOrientationType orientation_type =
       blink::kWebScreenOrientationUndefined;
-  int orientationAngle = 0;
+  int orientation_angle = 0;
   if (screen_orientation.isJust()) {
     Emulation::ScreenOrientation* orientation = screen_orientation.fromJust();
-    orientationType = WebScreenOrientationTypeFromString(
-        orientation->GetType());
-    if (orientationType == blink::kWebScreenOrientationUndefined)
+    orientation_type =
+        WebScreenOrientationTypeFromString(orientation->GetType());
+    if (orientation_type == blink::kWebScreenOrientationUndefined)
       return Response::InvalidParams("Invalid screen orientation type value");
-    orientationAngle = orientation->GetAngle();
-    if (orientationAngle < 0 || orientationAngle >= max_orientation_angle) {
+    orientation_angle = orientation->GetAngle();
+    if (orientation_angle < 0 || orientation_angle >= max_orientation_angle) {
       return Response::InvalidParams(
           "Screen orientation angle must be non-negative, less than " +
           base::IntToString(max_orientation_angle));
@@ -216,8 +217,10 @@ Response EmulationHandler::SetDeviceMetricsOverride(
   params.view_size = blink::WebSize(width, height);
   params.fit_to_view = fit_window;
   params.scale = scale.fromMaybe(1);
-  params.screen_orientation_type = orientationType;
-  params.screen_orientation_angle = orientationAngle;
+  params.screen_orientation_type = orientation_type;
+  params.screen_orientation_angle = orientation_angle;
+  params.override_gutter_color =
+      override_gutter_color.fromMaybe(true) && (width || height);
 
   if (device_emulation_enabled_ && params == device_emulation_params_)
     return Response::OK();