Unify background color gutters.

chrome/browser/android/compositor/scene_layer/tab_strip_scene_layer.cc

Index: chrome/browser/android/compositor/scene_layer/tab_strip_scene_layer.cc
diff --git a/chrome/browser/android/compositor/scene_layer/tab_strip_scene_layer.cc b/chrome/browser/android/compositor/scene_layer/tab_strip_scene_layer.cc
index 39179631d2e458bc477ba61cb1ecaa42eab3091d..ef171f588f832de9911d0c8deef977502d7b2a3f 100644
--- a/chrome/browser/android/compositor/scene_layer/tab_strip_scene_layer.cc
+++ b/chrome/browser/android/compositor/scene_layer/tab_strip_scene_layer.cc
@@ -318,6 +318,18 @@ scoped_refptr<TabHandleLayer> TabStripSceneLayer::GetNextLayer(
   return layer_tree;
 }
 
+bool TabStripSceneLayer::ShouldShowBackground() {
+  if (content_tree_)
+    return content_tree_->ShouldShowBackground();
+  return SceneLayer::ShouldShowBackground();
+}
+
+SkColor TabStripSceneLayer::GetBackgroundColor() {
+  if (content_tree_)
+    return content_tree_->GetBackgroundColor();
+  return SceneLayer::GetBackgroundColor();
+}
+
 static jlong Init(JNIEnv* env, const JavaParamRef<jobject>& jobj) {
   // This will automatically bind to the Java object and pass ownership there.
   TabStripSceneLayer* scene_layer = new TabStripSceneLayer(env, jobj);