Revert of Mustash: Ensure surfaces submitted to Mus by WM and embedders contain Surfaces with embeded content.

services/ui/ws/frame_generator.h

 // Copyright 2016 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.
 
 #ifndef SERVICES_UI_WS_FRAME_GENERATOR_H_
 #define SERVICES_UI_WS_FRAME_GENERATOR_H_
 
 #include <memory>
 #include <unordered_map>
 #include <vector>
@@ skipping 62 matching lines @@
 
   // cc::mojom::MojoCompositorFrameSinkClient implementation:
   void DidReceiveCompositorFrameAck() override;
   void OnBeginFrame(const cc::BeginFrameArgs& begin_frame_arags) override;
   void ReclaimResources(const cc::ReturnedResourceArray& resources) override;
   void WillDrawSurface() override;
 
   // Generates the CompositorFrame.
   cc::CompositorFrame GenerateCompositorFrame(const gfx::Rect& output_rect);
 
-  // DrawWindow creates SurfaceDrawQuad for the provided ServerWindow and
-  // appends it to the provided cc::RenderPass.
-  void DrawWindow(cc::RenderPass* pass, ServerWindow* window);
+  // DrawWindowTree recursively visits ServerWindows, creating a SurfaceDrawQuad
+  // for each that lacks one.
+  void DrawWindowTree(cc::RenderPass* pass,
+                      ServerWindow* window,
+                      const gfx::Vector2d& parent_to_root_origin_offset,
+                      float opacity);
 
   // Finds the parent surface id for |window|.
   cc::SurfaceId FindParentSurfaceId(ServerWindow* window);
 
   // Adds surface reference to local cache and surface manager.
   void AddSurfaceReference(const cc::SurfaceId& parent_id,
                            const cc::SurfaceId& child_id);
 
   // Does work necessary for adding the first surface reference.
   void AddFirstReference(const cc::SurfaceId& surface_id, ServerWindow* window);
@@ skipping 55 matching lines @@
   base::WeakPtrFactory<FrameGenerator> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(FrameGenerator);
 };
 
 }  // namespace ws
 
 }  // namespace ui
 
 #endif  // SERVICES_UI_WS_FRAME_GENERATOR_H_