cc: Avoid appending invisible TextureLayer quads.

cc/layers/texture_layer_impl.cc

 // Copyright 2011 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 "cc/layers/texture_layer_impl.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <vector>
@@ skipping 147 matching lines @@
   bool opaque = contents_opaque() || (SkColorGetA(bg_color) == 0xFF);
 
   gfx::Rect quad_rect(bounds());
   gfx::Rect opaque_rect = opaque ? quad_rect : gfx::Rect();
   gfx::Rect visible_quad_rect =
       draw_properties().occlusion_in_content_space.GetUnoccludedContentRect(
           quad_rect);
   if (visible_quad_rect.IsEmpty())
     return;
 
+  if (!vertex_opacity_[0] && !vertex_opacity_[1] && !vertex_opacity_[2] &&
+      !vertex_opacity_[3])
+    return;
+
   if (!texture_mailbox_.secure_output_only() ||
       (layer_tree_impl()->OutputIsSecure() && !InsideCopyRequest())) {
     TextureDrawQuad* quad =
         render_pass->CreateAndAppendDrawQuad<TextureDrawQuad>();
     ResourceId id =
         valid_texture_copy_ ? texture_copy_->id() : external_texture_resource_;
     quad->SetNew(shared_quad_state, quad_rect, opaque_rect, visible_quad_rect,
                  id, premultiplied_alpha_, uv_top_left_, uv_bottom_right_,
                  bg_color, vertex_opacity_, flipped_, nearest_neighbor_);
     if (!valid_texture_copy_) {
@@ skipping 84 matching lines @@
   } else if (external_texture_resource_) {
     DCHECK(!own_mailbox_);
     ResourceProvider* resource_provider =
         layer_tree_impl()->resource_provider();
     resource_provider->DeleteResource(external_texture_resource_);
     external_texture_resource_ = 0;
   }
 }
 
 }  // namespace cc