Avoid rendering using GL in case damage rect is composited by overlay

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 "cc/base/region.h"
 #include "cc/base/scoped_ptr_vector.h"
 #include "cc/output/compositor_frame_metadata.h"
 #include "cc/output/gl_renderer.h"
 #include "cc/output/output_surface.h"
 #include "cc/output/output_surface_client.h"
@@ skipping 1595 matching lines @@
   // Should not see the primary surface's overlay.
   output_surface_->set_is_displayed_as_overlay_plane(false);
   EXPECT_CALL(*renderer_, DoDrawQuad(_, _, _)).Times(3);
   EXPECT_CALL(scheduler_, Schedule(_, _, _, _, _)).Times(0);
   renderer_->DrawFrame(&pass_list, 1.f, viewport_rect, viewport_rect, false);
   SwapBuffers();
   Mock::VerifyAndClearExpectations(renderer_.get());
   Mock::VerifyAndClearExpectations(&scheduler_);
 }
 
+TEST_F(GLRendererWithOverlaysTest, OccludedQuadNotDrawn) {
+  bool use_validator = true;
+  Init(use_validator);
+  renderer_->set_expect_overlays(true);
+  gfx::Rect viewport_rect(16, 16);
+
+  scoped_ptr<RenderPass> pass = CreateRenderPass();
+
+  CreateFullscreenCandidateQuad(resource_provider_.get(),
+                                pass->shared_quad_state_list.back(),
+                                pass.get());
+
+  CreateFullscreenOpaqueQuad(resource_provider_.get(),
+                             pass->shared_quad_state_list.back(), pass.get());
+  CreateFullscreenOpaqueQuad(resource_provider_.get(),
+                             pass->shared_quad_state_list.back(), pass.get());
+
+  RenderPassList pass_list;
+  pass_list.push_back(pass.Pass());
+
+  output_surface_->set_is_displayed_as_overlay_plane(true);
+  EXPECT_CALL(*renderer_, DoDrawQuad(_, _, _)).Times(0);
+  EXPECT_CALL(scheduler_, Schedule(_, _, _, _, _)).Times(2);
+  renderer_->DrawFrame(&pass_list, 1.f, viewport_rect, viewport_rect, false);
+  SwapBuffers();
+  Mock::VerifyAndClearExpectations(renderer_.get());
+  Mock::VerifyAndClearExpectations(&scheduler_);
+}
+
 TEST_F(GLRendererWithOverlaysTest, ResourcesExportedAndReturnedWithDelay) {
   bool use_validator = true;
   Init(use_validator);
   renderer_->set_expect_overlays(true);
 
   ResourceId resource1 =
       CreateResource(resource_provider_.get(), gfx::Size(32, 32), true);
   ResourceId resource2 =
       CreateResource(resource_provider_.get(), gfx::Size(32, 32), true);
   ResourceId resource3 =
@@ skipping 104 matching lines @@
   renderer_->BeginDrawingFrame(&frame_no_overlays);
   renderer_->FinishDrawingFrame(&frame_no_overlays);
   EXPECT_TRUE(resource_provider_->InUseByConsumer(resource1));
   SwapBuffers();
   EXPECT_FALSE(resource_provider_->InUseByConsumer(resource1));
   Mock::VerifyAndClearExpectations(&scheduler_);
 }
 
 }  // namespace
 }  // namespace cc