Added MojoCompositorFrameSink::EvictFrame() and MojoCompositorFrameSinkClient::WillDrawSurface()

services/ui/ws/frame_generator.cc

 // 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.
 
 #include "services/ui/ws/frame_generator.h"
 
 #include "base/containers/adapters.h"
 #include "cc/output/compositor_frame.h"
 #include "cc/quads/render_pass.h"
 #include "cc/quads/render_pass_draw_quad.h"
@@ skipping 107 matching lines @@
     RemoveDeadSurfaceReferences();
   }
 }
 
 void FrameGenerator::ReclaimResources(
     const cc::ReturnedResourceArray& resources) {
   // Nothing to do here because FrameGenerator CompositorFrames don't reference
   // any resources.
 }
 
+void FrameGenerator::WillDrawSurface() {
+  // TODO(fsamuel, staraz): Implement this.
+  NOTIMPLEMENTED();

[kylechar, 2016/12/05 15:18:31]

This is causing lots of console spam. I think it gets called 60 times a second?

+}
+
 cc::CompositorFrame FrameGenerator::GenerateCompositorFrame(
     const gfx::Rect& output_rect) {
   const cc::RenderPassId render_pass_id(1, 1);
   std::unique_ptr<cc::RenderPass> render_pass = cc::RenderPass::Create();
   render_pass->SetNew(render_pass_id, output_rect, output_rect,
                       gfx::Transform());
 
   DrawWindowTree(render_pass.get(), root_window_, gfx::Vector2d(), 1.0f);
 
   cc::CompositorFrame frame;
@@ skipping 215 matching lines @@
   cc::SurfaceId underlay_surface_id =
       window->compositor_frame_sink_manager()->GetLatestSurfaceId(
           mojom::CompositorFrameSinkType::UNDERLAY);
   if (underlay_surface_id.is_valid())
     RemoveFrameSinkReference(underlay_surface_id.frame_sink_id());
 }
 
 }  // namespace ws
 
 }  // namespace ui