Split picture layer quads to allow removing more occluded area.

cc/layers/painted_scrollbar_layer_impl_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/layers/painted_scrollbar_layer_impl.h"
 
 #include <stddef.h>
 
 #include "cc/quads/draw_quad.h"
 #include "cc/quads/texture_draw_quad.h"
@@ skipping 54 matching lines @@
   gfx::Rect thumb_rect = scrollbar_layer_impl->ComputeThumbQuadRect();
   EXPECT_EQ(gfx::Rect(0, 500 / 4, 10, layer_size.height() / 2).ToString(),
             thumb_rect.ToString());
 
   {
     SCOPED_TRACE("No occlusion");
     gfx::Rect occluded;
     impl.AppendQuadsWithOcclusion(scrollbar_layer_impl, occluded);
 
     size_t partially_occluded_count = 0;
-    LayerTestCommon::VerifyQuadsAreOccluded(
-        impl.quad_list(), occluded, &partially_occluded_count);
+    LayerTestCommon::VerifyQuadsAreOccluded(impl.quad_list(), occluded, false,
+                                            &partially_occluded_count);
     EXPECT_EQ(2u, impl.quad_list().size());
     EXPECT_EQ(0u, partially_occluded_count);
 
     // Note: this is also testing that the thumb and track are both
     // scaled by the internal contents scale.  It's not occlusion-related
     // but is easy to verify here.
     const DrawQuad* thumb_draw_quad = impl.quad_list().ElementAt(0);
     const DrawQuad* track_draw_quad = impl.quad_list().ElementAt(1);
 
     EXPECT_EQ(DrawQuad::TEXTURE_CONTENT, thumb_draw_quad->material);
@@ skipping 30 matching lines @@
     LayerTestCommon::VerifyQuadsExactlyCoverRect(impl.quad_list(), gfx::Rect());
     EXPECT_EQ(impl.quad_list().size(), 0u);
   }
 
   {
     SCOPED_TRACE("Partial occlusion");
     gfx::Rect occluded(0, 0, 5, 1000);
     impl.AppendQuadsWithOcclusion(scrollbar_layer_impl, occluded);
 
     size_t partially_occluded_count = 0;
-    LayerTestCommon::VerifyQuadsAreOccluded(
-        impl.quad_list(), occluded, &partially_occluded_count);
+    LayerTestCommon::VerifyQuadsAreOccluded(impl.quad_list(), occluded, false,
+                                            &partially_occluded_count);
     // The layer outputs two quads, which is partially occluded.
     EXPECT_EQ(2u, impl.quad_list().size());
     EXPECT_EQ(2u, partially_occluded_count);
   }
 }
 
 }  // namespace
 }  // namespace cc