When possible, draw the toolbar shadow with the compositor

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

 // Copyright 2014 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/layer/tab_layer.h"
 
 #include "base/base_switches.h"
 #include "base/command_line.h"
 #include "base/i18n/rtl.h"
 #include "base/memory/ptr_util.h"
@@ skipping 80 matching lines @@
                       padding_rect.y() + content_position.y());
   transform.Translate(descaled_local_content_area.x(),
                       descaled_local_content_area.y());
   padding_layer->SetTransformOrigin(gfx::Point3F(0.f, 0.f, 0.f));
   padding_layer->SetTransform(transform);
 }
 
 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,
                              int back_logo_resource_id,
                              int border_resource_id,
                              int border_inner_shadow_resource_id,
                              int default_background_color,
                              int back_logo_color,
                              bool is_portrait,
                              float x,
@@ skipping 28 matching lines @@
                              int toolbar_background_color,
                              int close_button_color,
                              bool anonymize_toolbar,
                              int toolbar_textbox_resource_id,
                              int toolbar_textbox_background_color,
                              float toolbar_textbox_alpha,
                              float toolbar_alpha,
                              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;
   }
 
   layer_->SetHideLayerAndSubtree(false);
 
   // Grab required resources
   ui::ResourceManager::Resource* border_resource =
       resource_manager_->GetResource(ui::ANDROID_RESOURCE_TYPE_STATIC,
@@ skipping 66 matching lines @@
       contour_resource->size.height() - contour_padding.height());
 
   const float close_btn_effective_width = close_btn_width * close_alpha;
 
   //--------------------------------------------------------------------------
   // Update Resource Ids For Layers That Impact Layout
   //--------------------------------------------------------------------------
 
   // 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;
   if (show_toolbar && !back_visible)
     toolbar_impact_height = toolbar_layer_->layer()->bounds().height();
 
   //----------------------------------------------------------------------------
   // Compute Alpha and Visibility
   //----------------------------------------------------------------------------
   border_alpha *= alpha;
@@ skipping 469 matching lines @@
       title_->AddChild(layer);
     }
   }
 
   if (title)
     title->SetUIResourceIds();
 }
 
 }  //  namespace android
 }  //  namespace chrome