gpu: Empty swaps for surfaceless output surfaces.

cc/output/overlay_unittest.cc

 // Copyright 2014 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 <stddef.h>
 
 #include <utility>
 #include <vector>
 
 #include "base/memory/ptr_util.h"
@@ skipping 2172 matching lines @@
   CreateFullscreenOpaqueQuad(resource_provider_.get(),
                              pass->shared_quad_state_list.back(), pass.get());
 
   RenderPassList pass_list;
   pass_list.push_back(std::move(pass));
 
   output_surface_->set_is_displayed_as_overlay_plane(true);
   EXPECT_CALL(*renderer_, DoDrawQuad(_, _)).Times(0);
   EXPECT_CALL(scheduler_, Schedule(_, _, _, _, _)).Times(2);
   DrawFrame(&pass_list, viewport_size);
-  EXPECT_EQ(1U, output_surface_->bind_framebuffer_count());
+  EXPECT_EQ(0U, output_surface_->bind_framebuffer_count());
   SwapBuffers();
   Mock::VerifyAndClearExpectations(renderer_.get());
   Mock::VerifyAndClearExpectations(&scheduler_);
 }
 
 // GLRenderer skips drawing occluded quads when empty swap is enabled.
 TEST_F(GLRendererWithOverlaysTest, OccludedQuadNotDrawnWhenEmptySwapAllowed) {
   provider_->TestContext3d()->set_have_commit_overlay_planes(true);
   bool use_validator = true;
   Init(use_validator);
@@ skipping 11 matching lines @@
   CreateFullscreenOpaqueQuad(resource_provider_.get(),
                              pass->shared_quad_state_list.back(), pass.get());
 
   RenderPassList pass_list;
   pass_list.push_back(std::move(pass));
 
   output_surface_->set_is_displayed_as_overlay_plane(true);
   EXPECT_CALL(*renderer_, DoDrawQuad(_, _)).Times(0);
   EXPECT_CALL(scheduler_, Schedule(_, _, _, _, _)).Times(2);
   DrawFrame(&pass_list, viewport_size);
-  EXPECT_EQ(1U, output_surface_->bind_framebuffer_count());
+  EXPECT_EQ(0U, output_surface_->bind_framebuffer_count());
   SwapBuffers();
   Mock::VerifyAndClearExpectations(renderer_.get());
   Mock::VerifyAndClearExpectations(&scheduler_);
 }
 
 TEST_F(GLRendererWithOverlaysTest, ResourcesExportedAndReturnedWithDelay) {
   bool use_validator = true;
   Init(use_validator);
   renderer_->set_expect_overlays(true);
 
@@ skipping 363 matching lines @@
                  kOverlayRect, render_pass_id_, 2, gfx::RectF(), gfx::Size(),
                  gfx::Vector2dF(1, 1), gfx::PointF(), gfx::RectF());
   }
 
   ProcessForOverlays();
   EXPECT_EQ(0U, ca_layer_list_.size());
 }
 
 }  // namespace
 }  // namespace cc