Hide fullscreen rotation jank

content/browser/renderer_host/fullscreen_jank_detector_unittest.cc

+// Copyright (c) 2017 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 "content/browser/renderer_host/fullscreen_jank_detector.h"
+
+#include "base/macros.h"
+#include "base/memory/ptr_util.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace content {
+
+namespace {
+
+const gfx::Size size1 = gfx::Size(1, 2);
+const gfx::Size size2 = gfx::Size(2, 1);
+
+}  // anonymous namespace
+
+class FullscreenJankDetectorTest : public ::testing::Test {
+ public:
+  FullscreenJankDetectorTest() {}
+  ~FullscreenJankDetectorTest() override {}
+
+  void SetUp() override { InitializeState(); }
+
+ protected:
+  FullscreenJankDetector detector_;
+
+ private:
+  void InitializeState() {
+    detector_.OnPhysicalBackingSizeChanged(size1);
+    detector_.OnFrameMetadataUpdated(false, size1);
+    EXPECT_FALSE(detector_.IsInFullscreenTransition());
+  }
+
+  DISALLOW_COPY_AND_ASSIGN(FullscreenJankDetectorTest);
+};
+
+TEST_F(FullscreenJankDetectorTest, ChangingSizeWhileNotFullscreenIsNotJank) {
+  detector_.OnPhysicalBackingSizeChanged(size2);
+  EXPECT_FALSE(detector_.IsInFullscreenTransition());
+}
+
+TEST_F(FullscreenJankDetectorTest, EnterFullscreenRotateExitFullscreen) {
+  // Entering fullscreen is jank.
+  detector_.OnFullscreenStateChanged(true);
+  EXPECT_TRUE(detector_.IsInFullscreenTransition());
+
+  // We received a new view size, but the frame size doesn't match.
+  detector_.OnPhysicalBackingSizeChanged(size2);
+  EXPECT_TRUE(detector_.IsInFullscreenTransition());
+
+  // We received a new frame with the correct size and fullscreen state.
+  detector_.OnFrameMetadataUpdated(true, size2);
+  EXPECT_FALSE(detector_.IsInFullscreenTransition());
+
+  // View size rotates.
+  detector_.OnPhysicalBackingSizeChanged(size1);
+  EXPECT_TRUE(detector_.IsInFullscreenTransition());
+
+  // Frame size catches up.
+  detector_.OnFrameMetadataUpdated(true, size1);
+  EXPECT_FALSE(detector_.IsInFullscreenTransition());
+
+  // Exiting fullscreen is jank.
+  detector_.OnFullscreenStateChanged(false);
+  EXPECT_TRUE(detector_.IsInFullscreenTransition());
+
+  // New view size.
+  detector_.OnPhysicalBackingSizeChanged(size2);
+  EXPECT_TRUE(detector_.IsInFullscreenTransition());
+
+  // Correctly-sized frame.
+  detector_.OnFrameMetadataUpdated(false, size2);
+  EXPECT_FALSE(detector_.IsInFullscreenTransition());
+}
+
+}  // namespace content