Blend TextureLayer background-color at draw time.

cc/layers/texture_layer_impl.h

Index: cc/layers/texture_layer_impl.h
diff --git a/cc/layers/texture_layer_impl.h b/cc/layers/texture_layer_impl.h
index 63a9c0f38a5ea6f6890c263d970c2a9d3b01a078..4cd2492463f5291fa3420f58657ccd4ffd83fc81 100644
--- a/cc/layers/texture_layer_impl.h
+++ b/cc/layers/texture_layer_impl.h
@@ -39,6 +39,9 @@ class CC_EXPORT TextureLayerImpl : public LayerImpl {
   void set_premultiplied_alpha(bool premultiplied_alpha) {
     premultiplied_alpha_ = premultiplied_alpha;
   }
+  void set_blend_background_color(bool blend) {
+    blend_background_color_ = blend;
+  }
   void set_flipped(bool flipped) { flipped_ = flipped; }
   void set_uv_top_left(gfx::PointF top_left) { uv_top_left_ = top_left; }
   void set_uv_bottom_right(gfx::PointF bottom_right) {
@@ -68,6 +71,7 @@ class CC_EXPORT TextureLayerImpl : public LayerImpl {
   unsigned texture_id_;
   ResourceProvider::ResourceId external_texture_resource_;
   bool premultiplied_alpha_;
+  bool blend_background_color_;
   bool flipped_;
   gfx::PointF uv_top_left_;
   gfx::PointF uv_bottom_right_;