Unify background color gutters.

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

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/android/compositor/scene_layer/tab_strip_scene_layer.h"
 
 #include "base/android/jni_android.h"
 #include "cc/resources/scoped_ui_resource.h"
 #include "chrome/browser/android/compositor/layer/tab_handle_layer.h"
 #include "chrome/browser/android/compositor/layer_title_cache.h"
@@ skipping 300 matching lines @@
     return tab_handle_layers_[write_index_++];
 
   scoped_refptr<TabHandleLayer> layer_tree =
       TabHandleLayer::Create(layer_title_cache);
   tab_handle_layers_.push_back(layer_tree);
   scrollable_strip_layer_->AddChild(layer_tree->layer());
   write_index_++;
   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);
   return reinterpret_cast<intptr_t>(scene_layer);
 }
 
 bool RegisterTabStripSceneLayer(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace android