Clear ui::Layer damaged_region_ after commit.

ui/compositor/layer_unittest.cc

 // Copyright (c) 2012 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 "ui/compositor/layer.h"
 
 #include <stddef.h>
 
 #include <memory>
 #include <utility>
@@ skipping 908 matching lines @@
 
   // The CompositorDelegate (us) should have been told to draw for a move.
   WaitForDraw();
 
   l1->SetBounds(gfx::Rect(5, 5, 100, 100));
 
   // The CompositorDelegate (us) should have been told to draw for a resize.
   WaitForDraw();
 }
 
+static void EmptyReleaseCallback(const gpu::SyncToken& sync_token,
+                                 bool is_lost) {}
+
+// Checks that the damage rect for a TextureLayer is empty after a commit.
+TEST_F(LayerWithNullDelegateTest, EmptyDamagedRect) {
+  std::unique_ptr<Layer> root(CreateLayer(LAYER_SOLID_COLOR));
+  cc::TextureMailbox mailbox(gpu::Mailbox::Generate(), gpu::SyncToken(), 0);
+  root->SetTextureMailbox(mailbox, cc::SingleReleaseCallback::Create(
+                                       base::Bind(EmptyReleaseCallback)),
+                          gfx::Size(10, 10));
+  compositor()->SetRootLayer(root.get());
+
+  root->SetBounds(gfx::Rect(0, 0, 10, 10));
+  root->SetVisible(true);
+  WaitForCommit();
+
+  gfx::Rect damaged_rect(0, 0, 5, 5);
+  root->SchedulePaint(damaged_rect);
+  EXPECT_EQ(damaged_rect, root->damaged_region_for_testing().bounds());
+  WaitForCommit();
+  EXPECT_TRUE(root->damaged_region_for_testing().IsEmpty());
+
+  compositor()->SetRootLayer(nullptr);
+  root.reset();
+  WaitForCommit();
+}
+
 void ExpectRgba(int x, int y, SkColor expected_color, SkColor actual_color) {
   EXPECT_EQ(expected_color, actual_color)
       << "Pixel error at x=" << x << " y=" << y << "; "
       << "actual RGBA=("
       << SkColorGetR(actual_color) << ","
       << SkColorGetG(actual_color) << ","
       << SkColorGetB(actual_color) << ","
       << SkColorGetA(actual_color) << "); "
       << "expected RGBA=("
       << SkColorGetR(expected_color) << ","
@@ skipping 938 matching lines @@
   root->SetOpacity(0.5f);
   WaitForSwap();
   EXPECT_EQ(1u, animation_observer.animation_step_count());
 
   EXPECT_FALSE(animation_observer.shutdown());
   ResetCompositor();
   EXPECT_TRUE(animation_observer.shutdown());
 }
 
 }  // namespace ui