cc: Allow overlay candidates with transforms.

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/containers/flat_map.h"
@@ skipping 988 matching lines @@
   OverlayCandidateList candidate_list;
   base::flat_map<int, FilterOperations*> render_pass_filters;
   base::flat_map<int, FilterOperations*> render_pass_background_filters;
   overlay_processor_->ProcessForOverlays(
       resource_provider_.get(), pass.get(), render_pass_filters,
       render_pass_background_filters, &candidate_list, nullptr, nullptr,
       &damage_rect_, &content_bounds_);
   EXPECT_EQ(1U, candidate_list.size());
 }
 
-TEST_F(SingleOverlayOnTopTest, RejectTransform) {
+TEST_F(SingleOverlayOnTopTest, AcceptMirrorYTransform) {
   gfx::Rect rect = kOverlayRect;
   rect.Offset(0, -rect.height());
   std::unique_ptr<RenderPass> pass = CreateRenderPass();
   CreateCandidateQuadAt(resource_provider_.get(),
                         pass->shared_quad_state_list.back(), pass.get(), rect);
-  pass->shared_quad_state_list.back()
-      ->quad_to_target_transform.RotateAboutZAxis(90.f);
+  pass->shared_quad_state_list.back()->quad_to_target_transform.Scale(1.f,
+                                                                      -1.f);
 
   OverlayCandidateList candidate_list;
   base::flat_map<int, FilterOperations*> render_pass_filters;
   base::flat_map<int, FilterOperations*> render_pass_background_filters;
   overlay_processor_->ProcessForOverlays(
       resource_provider_.get(), pass.get(), render_pass_filters,
       render_pass_background_filters, &candidate_list, nullptr, nullptr,
       &damage_rect_, &content_bounds_);
-  ASSERT_EQ(0U, candidate_list.size());
+  ASSERT_EQ(1U, candidate_list.size());
 }
 
 TEST_F(UnderlayTest, Allow90DegreeRotation) {
   gfx::Rect rect = kOverlayRect;
   rect.Offset(0, -rect.height());
   std::unique_ptr<RenderPass> pass = CreateRenderPass();
   CreateCandidateQuadAt(resource_provider_.get(),
                         pass->shared_quad_state_list.back(), pass.get(), rect);
   pass->shared_quad_state_list.back()
       ->quad_to_target_transform.RotateAboutZAxis(90.f);
@@ skipping 1563 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