cc: Cleanup Layer::SetNeedsDisplayInRect

cc/layers/layer_unittest.cc

 // Copyright 2011 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/layer.h"
 
 #include "cc/animation/keyframed_animation_curve.h"
 #include "cc/base/math_util.h"
 #include "cc/layers/layer_impl.h"
 #include "cc/resources/layer_painter.h"
@@ skipping 492 matching lines @@
   EXPECT_TRUE(test_layer->NeedsDisplayForTesting());
   test_layer->ResetNeedsDisplayForTesting();
 
   // Case 2: SetNeedsDisplay() without the dirty rect arg.
   test_layer->ResetNeedsDisplayForTesting();
   EXPECT_FALSE(test_layer->NeedsDisplayForTesting());
   EXPECT_SET_NEEDS_UPDATE(1, test_layer->SetNeedsDisplay());
   EXPECT_TRUE(test_layer->NeedsDisplayForTesting());
   test_layer->ResetNeedsDisplayForTesting();
 
-  // Case 3: SetNeedsDisplay() with a non-drawable layer
+  // Case 3: SetNeedsDisplay() with an empty rect.
+  test_layer->ResetNeedsDisplayForTesting();
+  EXPECT_FALSE(test_layer->NeedsDisplayForTesting());
+  EXPECT_SET_NEEDS_COMMIT(0, test_layer->SetNeedsDisplayRect(gfx::Rect()));
+  EXPECT_FALSE(test_layer->NeedsDisplayForTesting());
+
+  // Case 4: SetNeedsDisplay() with a non-drawable layer
   EXPECT_SET_NEEDS_COMMIT(1, test_layer->SetIsDrawable(false));
   test_layer->ResetNeedsDisplayForTesting();
   EXPECT_FALSE(test_layer->NeedsDisplayForTesting());
   EXPECT_SET_NEEDS_UPDATE(0, test_layer->SetNeedsDisplayRect(dirty1));
   EXPECT_TRUE(test_layer->NeedsDisplayForTesting());
 }
 
 TEST_F(LayerTest, CheckPropertyChangeCausesCorrectBehavior) {
   scoped_refptr<Layer> test_layer = Layer::Create();
   EXPECT_SET_NEEDS_FULL_TREE_SYNC(
@@ skipping 483 matching lines @@
               << "Flags: " << contents_opaque << ", " << layer_opaque << ", "
               << host_opaque << "\n";
         }
       }
     }
   }
 }
 
 }  // namespace
 }  // namespace cc