Remove offscreen compositor contexts.

cc/layers/delegated_renderer_layer.cc

Index: cc/layers/delegated_renderer_layer.cc
diff --git a/cc/layers/delegated_renderer_layer.cc b/cc/layers/delegated_renderer_layer.cc
index 1dab3c8e0f73b58a67a40bb2e67d6f66ba079d55..194455ac268a80805deea4a0798f7d5edb111454 100644
--- a/cc/layers/delegated_renderer_layer.cc
+++ b/cc/layers/delegated_renderer_layer.cc
@@ -93,25 +93,6 @@ void DelegatedRendererLayer::SetDisplaySize(const gfx::Size& size) {
   SetNeedsCommit();
 }
 
-static bool FrameDataRequiresFilterContext(const DelegatedFrameData* frame) {
-  for (size_t i = 0; i < frame->render_pass_list.size(); ++i) {
-    const QuadList& quad_list = frame->render_pass_list[i]->quad_list;
-    for (size_t j = 0; j < quad_list.size(); ++j) {
-      if (quad_list[j]->shared_quad_state->blend_mode !=
-          SkXfermode::kSrcOver_Mode)
-        return true;
-      if (quad_list[j]->material != DrawQuad::RENDER_PASS)
-        continue;
-      const RenderPassDrawQuad* render_pass_quad =
-          RenderPassDrawQuad::MaterialCast(quad_list[j]);
-      if (!render_pass_quad->filters.IsEmpty() ||
-          !render_pass_quad->background_filters.IsEmpty())
-        return true;
-    }
-  }
-  return false;
-}
-
 bool DelegatedRendererLayer::Update(ResourceUpdateQueue* queue,
                                     const OcclusionTracker<Layer>* occlusion) {
   bool updated = Layer::Update(queue, occlusion);
@@ -122,11 +103,6 @@ bool DelegatedRendererLayer::Update(ResourceUpdateQueue* queue,
       frame_provider_->GetFrameDataAndRefResources(this, &frame_damage_);
   should_collect_new_frame_ = false;
 
-  // If any quad has a filter operation or a blend mode other than normal,
-  // then we need an offscreen context to draw this layer's content.
-  if (FrameDataRequiresFilterContext(frame_data_))
-    layer_tree_host()->set_needs_filter_context();
-
   SetNeedsPushProperties();
   return true;
 }