When possible, draw the toolbar shadow with the compositor

chrome/browser/android/compositor/layer/tab_layer.cc

Index: chrome/browser/android/compositor/layer/tab_layer.cc
diff --git a/chrome/browser/android/compositor/layer/tab_layer.cc b/chrome/browser/android/compositor/layer/tab_layer.cc
index 74f58562b4d350b13b236305cd5e82d0d4f3c9a0..a70ba59de6324bddf069858e6382c290c3178782 100644
--- a/chrome/browser/android/compositor/layer/tab_layer.cc
+++ b/chrome/browser/android/compositor/layer/tab_layer.cc
@@ -98,6 +98,7 @@ static void PositionPadding(scoped_refptr<cc::SolidColorLayer> padding_layer,
 void TabLayer::SetProperties(int id,
                              bool can_use_live_layer,
                              int toolbar_resource_id,
+                             int toolbar_shadow_resource_id,
                              int close_button_resource_id,
                              int shadow_resource_id,
                              int contour_resource_id,
@@ -146,7 +147,8 @@ void TabLayer::SetProperties(int id,
                              float toolbar_y_offset,
                              float side_border_scale,
                              bool attach_content,
-                             bool inset_border) {
+                             bool inset_border,
+                             bool needs_toolbar_shadow) {
   if (alpha <= 0) {
     layer_->SetHideLayerAndSubtree(true);
     return;
@@ -233,13 +235,14 @@ void TabLayer::SetProperties(int id,
 
   // TODO(kkimlabs): Tab switcher doesn't show the progress bar.
   toolbar_layer_->PushResource(toolbar_resource_id,
+                               toolbar_shadow_resource_id,
                                toolbar_background_color,
                                anonymize_toolbar,
                                toolbar_textbox_background_color,
                                toolbar_textbox_resource_id,
                                toolbar_textbox_alpha,
                                false,
-                               false);
+                               needs_toolbar_shadow);
   toolbar_layer_->UpdateProgressBar(0, 0, 0, 0, 0, 0, 0, 0, 0, 0);
 
   float toolbar_impact_height = 0;