Notify paint for each frame

third_party/WebKit/Source/platform/graphics/paint/PaintControllerTest.cpp

Index: third_party/WebKit/Source/platform/graphics/paint/PaintControllerTest.cpp
diff --git a/third_party/WebKit/Source/platform/graphics/paint/PaintControllerTest.cpp b/third_party/WebKit/Source/platform/graphics/paint/PaintControllerTest.cpp
index 9904efebe90c1d1137e7c3922762ffbd90d109f1..bd5b1043707e33fe4fa5744de21d30e6b6285e44 100644
--- a/third_party/WebKit/Source/platform/graphics/paint/PaintControllerTest.cpp
+++ b/third_party/WebKit/Source/platform/graphics/paint/PaintControllerTest.cpp
@@ -2056,6 +2056,49 @@ TEST_F(PaintControllerTestBase,
   }
 }
 
+TEST_F(PaintControllerTestBase, BeginAndEndFrame) {
+  class FakeFrame {};
+
+  // PaintController should have one null frame in the stack since beginning.
+  GetPaintController().SetFirstPainted();
+  FrameFirstPaint result = GetPaintController().EndFrame(nullptr);
+  EXPECT_TRUE(result.first_painted);
+  EXPECT_FALSE(result.text_painted);
+  EXPECT_FALSE(result.image_painted);
+  // Readd the null frame.
+  GetPaintController().BeginFrame(nullptr);
+
+  std::unique_ptr<FakeFrame> frame1(new FakeFrame);
+  GetPaintController().BeginFrame(frame1.get());
+  GetPaintController().SetFirstPainted();
+  GetPaintController().SetTextPainted();
+  GetPaintController().SetImagePainted();
+
+  result = GetPaintController().EndFrame(frame1.get());
+  EXPECT_TRUE(result.first_painted);
+  EXPECT_TRUE(result.text_painted);
+  EXPECT_TRUE(result.image_painted);
+
+  std::unique_ptr<FakeFrame> frame2(new FakeFrame);
+  GetPaintController().BeginFrame(frame2.get());
+  GetPaintController().SetFirstPainted();
+
+  std::unique_ptr<FakeFrame> frame3(new FakeFrame);
+  GetPaintController().BeginFrame(frame3.get());
+  GetPaintController().SetTextPainted();
+  GetPaintController().SetImagePainted();
+
+  result = GetPaintController().EndFrame(frame3.get());
+  EXPECT_FALSE(result.first_painted);
+  EXPECT_TRUE(result.text_painted);
+  EXPECT_TRUE(result.image_painted);
+
+  result = GetPaintController().EndFrame(frame2.get());
+  EXPECT_TRUE(result.first_painted);
+  EXPECT_FALSE(result.text_painted);
+  EXPECT_FALSE(result.image_painted);
+}
+
 // Death tests don't work properly on Android.
 #if defined(GTEST_HAS_DEATH_TEST) && !OS(ANDROID)