Do not show tab title when it is not needed

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/i18n/rtl.h"
 #include "base/memory/ptr_util.h"
 #include "cc/layers/layer.h"
 #include "cc/layers/layer_collections.h"
@@ skipping 118 matching lines @@
                              float static_to_view_blend,
                              float content_width,
                              float content_height,
                              float view_width,
                              float view_height,
                              bool show_toolbar,
                              int default_theme_color,
                              int toolbar_background_color,
                              int close_button_color,
                              bool anonymize_toolbar,
+                             bool show_tab_title,
                              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 inset_border) {
   if (alpha <= 0) {
     layer_->SetHideLayerAndSubtree(true);
     return;
@@ skipping 231 matching lines @@
   gfx::Size desired_content_size(desired_content_size_pt.x(),
                                  desired_content_size_pt.y());
 
   //----------------------------------------------------------------------------
   // Calculate Content Visibility
   //----------------------------------------------------------------------------
   // Check if the rect we are drawing is larger than the content rect.
   bool content_visible = desired_content_size.GetArea() > 0.f;
 
   // TODO(dtrainor): Improve these calculations to prune these layers out.
-  bool title_visible = border_alpha > 0.f && !back_visible;
+  bool title_visible = border_alpha > 0.f && !back_visible && show_tab_title;
   bool close_btn_visible = title_visible;
   bool toolbar_visible = show_toolbar && toolbar_alpha > 0.f && !back_visible;
 
   //----------------------------------------------------------------------------
   // Fix jaggies
   //----------------------------------------------------------------------------
   border_position.Offset(0.5f, 0.5f);
   border_inner_shadow_position.Offset(0.5f, 0.5f);
   shadow_position.Offset(0.5f, 0.5f);
   contour_position.Offset(0.5f, 0.5f);
@@ skipping 277 matching lines @@
       title_->RemoveAllChildren();
       title_->AddChild(layer);
     }
   }
 
   if (title)
     title->SetUIResourceIds();
 }
 
 }  //  namespace android