Update from https://crrev.com/304418

cc/layers/nine_patch_layer_impl.cc

Index: cc/layers/nine_patch_layer_impl.cc
diff --git a/cc/layers/nine_patch_layer_impl.cc b/cc/layers/nine_patch_layer_impl.cc
index 1c76d110a9f0e6cf92344c5b50a7167fbf59eafe..0dd2b6fe14ba0652e8af337c62e3b1f974918713 100644
--- a/cc/layers/nine_patch_layer_impl.cc
+++ b/cc/layers/nine_patch_layer_impl.cc
@@ -207,14 +207,14 @@ void NinePatchLayerImpl::AppendQuads(
                        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>();
@@ -233,6 +233,7 @@ void NinePatchLayerImpl::AppendQuads(
 
   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>();
@@ -251,6 +252,7 @@ void NinePatchLayerImpl::AppendQuads(
 
   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>();
@@ -269,6 +271,7 @@ void NinePatchLayerImpl::AppendQuads(
 
   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>();
@@ -286,6 +289,7 @@ void NinePatchLayerImpl::AppendQuads(
   }
 
   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>();
@@ -304,6 +308,7 @@ void NinePatchLayerImpl::AppendQuads(
 
   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>();
@@ -322,6 +327,7 @@ void NinePatchLayerImpl::AppendQuads(
 
   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>();
@@ -340,6 +346,7 @@ void NinePatchLayerImpl::AppendQuads(
 
   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>();
@@ -359,6 +366,7 @@ void NinePatchLayerImpl::AppendQuads(
   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>();