When possible, draw the toolbar shadow with the compositor

chrome/browser/android/compositor/scene_layer/toolbar_scene_layer.h

 // Copyright 2016 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.
 
 #ifndef CHROME_BROWSER_ANDROID_COMPOSITOR_SCENE_LAYER_TOOLBAR_SCENE_LAYER_H_
 #define CHROME_BROWSER_ANDROID_COMPOSITOR_SCENE_LAYER_TOOLBAR_SCENE_LAYER_H_
 
 #include <memory>
 #include <vector>
 
@@ skipping 18 matching lines @@
  public:
   ToolbarSceneLayer(JNIEnv* env, jobject jobj);
   ~ToolbarSceneLayer() override;
 
   // Update the compositor version of the toolbar.
   void UpdateToolbarLayer(
       JNIEnv* env,
       const base::android::JavaParamRef<jobject>& object,
       const base::android::JavaParamRef<jobject>& jresource_manager,
       jint toolbar_resource_id,
+      jint toolbar_shadow_resource_id,
       jint toolbar_background_color,
       jint url_bar_resource_id,
       jfloat url_bar_alpha,
       jfloat top_offset,
       bool visible,
       bool show_shadow);
 
   // Update the progress bar.
   void UpdateProgressBar(
       JNIEnv* env,
@@ skipping 26 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(ToolbarSceneLayer);
 };
 
 bool RegisterToolbarSceneLayer(JNIEnv* env);
 
 }  // namespace android
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_ANDROID_COMPOSITOR_SCENE_LAYER_TOOLBAR_SCENE_LAYER_H_