Update from https://crrev.com/304418

cc/layers/nine_patch_layer_impl.cc

 // Copyright 2012 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/nine_patch_layer_impl.h"
 
 #include "base/strings/stringprintf.h"
 #include "base/values.h"
 #include "cc/base/math_util.h"
 #include "cc/quads/texture_draw_quad.h"
@@ skipping 189 matching lines @@
                       uv_left.height());
   gfx::RectF uv_bottom(uv_top.x(),
                        uv_bottom_left.y(),
                        uv_top.width(),
                        image_aperture_bottom_height / image_height);
   gfx::RectF uv_center(uv_top_left.right(),
                        uv_top_left.bottom(),
                        uv_top.width(),
                        uv_left.height());
 
-  // Nothing is opaque here.
-  // TODO(danakj): Should we look at the SkBitmaps to determine opaqueness?
   gfx::Rect opaque_rect;
   gfx::Rect visible_rect;
   const float vertex_opacity[] = {1.0f, 1.0f, 1.0f, 1.0f};
+  const bool opaque = layer_tree_impl()->IsUIResourceOpaque(ui_resource_id_);
 
   visible_rect =
       occlusion_in_content_space.GetUnoccludedContentRect(layer_top_left);
+  opaque_rect = opaque ? visible_rect : gfx::Rect();
   if (!visible_rect.IsEmpty()) {
     TextureDrawQuad* quad =
         render_pass->CreateAndAppendDrawQuad<TextureDrawQuad>();
     quad->SetNew(shared_quad_state,
                  layer_top_left,
                  opaque_rect,
                  visible_rect,
                  resource,
                  premultiplied_alpha,
                  uv_top_left.origin(),
                  uv_top_left.bottom_right(),
                  SK_ColorTRANSPARENT,
                  vertex_opacity,
                  flipped);
   }
 
   visible_rect =
       occlusion_in_content_space.GetUnoccludedContentRect(layer_top_right);
+  opaque_rect = opaque ? visible_rect : gfx::Rect();
   if (!visible_rect.IsEmpty()) {
     TextureDrawQuad* quad =
         render_pass->CreateAndAppendDrawQuad<TextureDrawQuad>();
     quad->SetNew(shared_quad_state,
                  layer_top_right,
                  opaque_rect,
                  visible_rect,
                  resource,
                  premultiplied_alpha,
                  uv_top_right.origin(),
                  uv_top_right.bottom_right(),
                  SK_ColorTRANSPARENT,
                  vertex_opacity,
                  flipped);
   }
 
   visible_rect =
       occlusion_in_content_space.GetUnoccludedContentRect(layer_bottom_left);
+  opaque_rect = opaque ? visible_rect : gfx::Rect();
   if (!visible_rect.IsEmpty()) {
     TextureDrawQuad* quad =
         render_pass->CreateAndAppendDrawQuad<TextureDrawQuad>();
     quad->SetNew(shared_quad_state,
                  layer_bottom_left,
                  opaque_rect,
                  visible_rect,
                  resource,
                  premultiplied_alpha,
                  uv_bottom_left.origin(),
                  uv_bottom_left.bottom_right(),
                  SK_ColorTRANSPARENT,
                  vertex_opacity,
                  flipped);
   }
 
   visible_rect =
       occlusion_in_content_space.GetUnoccludedContentRect(layer_bottom_right);
+  opaque_rect = opaque ? visible_rect : gfx::Rect();
   if (!visible_rect.IsEmpty()) {
     TextureDrawQuad* quad =
         render_pass->CreateAndAppendDrawQuad<TextureDrawQuad>();
     quad->SetNew(shared_quad_state,
                  layer_bottom_right,
                  opaque_rect,
                  visible_rect,
                  resource,
                  premultiplied_alpha,
                  uv_bottom_right.origin(),
                  uv_bottom_right.bottom_right(),
                  SK_ColorTRANSPARENT,
                  vertex_opacity,
                  flipped);
   }
 
   visible_rect = occlusion_in_content_space.GetUnoccludedContentRect(layer_top);
+  opaque_rect = opaque ? visible_rect : gfx::Rect();
   if (!visible_rect.IsEmpty()) {
     TextureDrawQuad* quad =
         render_pass->CreateAndAppendDrawQuad<TextureDrawQuad>();
     quad->SetNew(shared_quad_state,
                  layer_top,
                  opaque_rect,
                  visible_rect,
                  resource,
                  premultiplied_alpha,
                  uv_top.origin(),
                  uv_top.bottom_right(),
                  SK_ColorTRANSPARENT,
                  vertex_opacity,
                  flipped);
   }
 
   visible_rect =
       occlusion_in_content_space.GetUnoccludedContentRect(layer_left);
+  opaque_rect = opaque ? visible_rect : gfx::Rect();
   if (!visible_rect.IsEmpty()) {
     TextureDrawQuad* quad =
         render_pass->CreateAndAppendDrawQuad<TextureDrawQuad>();
     quad->SetNew(shared_quad_state,
                  layer_left,
                  opaque_rect,
                  visible_rect,
                  resource,
                  premultiplied_alpha,
                  uv_left.origin(),
                  uv_left.bottom_right(),
                  SK_ColorTRANSPARENT,
                  vertex_opacity,
                  flipped);
   }
 
   visible_rect =
       occlusion_in_content_space.GetUnoccludedContentRect(layer_right);
+  opaque_rect = opaque ? visible_rect : gfx::Rect();
   if (!visible_rect.IsEmpty()) {
     TextureDrawQuad* quad =
         render_pass->CreateAndAppendDrawQuad<TextureDrawQuad>();
     quad->SetNew(shared_quad_state,
                  layer_right,
                  opaque_rect,
                  layer_right,
                  resource,
                  premultiplied_alpha,
                  uv_right.origin(),
                  uv_right.bottom_right(),
                  SK_ColorTRANSPARENT,
                  vertex_opacity,
                  flipped);
   }
 
   visible_rect =
       occlusion_in_content_space.GetUnoccludedContentRect(layer_bottom);
+  opaque_rect = opaque ? visible_rect : gfx::Rect();
   if (!visible_rect.IsEmpty()) {
     TextureDrawQuad* quad =
         render_pass->CreateAndAppendDrawQuad<TextureDrawQuad>();
     quad->SetNew(shared_quad_state,
                  layer_bottom,
                  opaque_rect,
                  visible_rect,
                  resource,
                  premultiplied_alpha,
                  uv_bottom.origin(),
                  uv_bottom.bottom_right(),
                  SK_ColorTRANSPARENT,
                  vertex_opacity,
                  flipped);
   }
 
   if (fill_center_) {
     visible_rect =
         occlusion_in_content_space.GetUnoccludedContentRect(layer_center);
+    opaque_rect = opaque ? visible_rect : gfx::Rect();
     if (!visible_rect.IsEmpty()) {
       TextureDrawQuad* quad =
           render_pass->CreateAndAppendDrawQuad<TextureDrawQuad>();
       quad->SetNew(shared_quad_state,
                    layer_center,
                    opaque_rect,
                    visible_rect,
                    resource,
                    premultiplied_alpha,
                    uv_center.origin(),
@@ skipping 25 matching lines @@
   result->Set("ImageBounds", list);
 
   result->Set("Border", MathUtil::AsValue(border_).release());
 
   result->SetBoolean("FillCenter", fill_center_);
 
   return result;
 }
 
 }  // namespace cc