Reapply "Let Layout::GetSupportedScaleFactorFromScale() return only supported ScaleFactor."

ui/base/layout_unittest.cc

Index: ui/base/layout_unittest.cc
diff --git a/ui/base/layout_unittest.cc b/ui/base/layout_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..a38bbc26608a06a7b8cbe26c3640c0fa8304cd9c
--- /dev/null
+++ b/ui/base/layout_unittest.cc
@@ -0,0 +1,67 @@
+// 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/base/layout.h"
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace ui {
+
+TEST(LayoutTest, GetScaleFactorScale) {
+  EXPECT_FLOAT_EQ(1.0f, GetScaleFactorScale(SCALE_FACTOR_100P));
+  EXPECT_FLOAT_EQ(1.4f, GetScaleFactorScale(SCALE_FACTOR_140P));
+  EXPECT_FLOAT_EQ(1.8f, GetScaleFactorScale(SCALE_FACTOR_180P));
+  EXPECT_FLOAT_EQ(2.0f, GetScaleFactorScale(SCALE_FACTOR_200P));
+}
+
+TEST(LayoutTest, GetScaleFactorFromScalePartlySupported) {
+  std::vector<ScaleFactor> original_supported_factors =
+      GetSupportedScaleFactors();
+
+  std::vector<ScaleFactor> supported_factors;
+  supported_factors.push_back(SCALE_FACTOR_100P);
+  supported_factors.push_back(SCALE_FACTOR_180P);
+  test::SetSupportedScaleFactors(supported_factors);
+  EXPECT_EQ(SCALE_FACTOR_100P, GetScaleFactorFromScale(0.1f));
+  EXPECT_EQ(SCALE_FACTOR_100P, GetScaleFactorFromScale(0.9f));
+  EXPECT_EQ(SCALE_FACTOR_100P, GetScaleFactorFromScale(1.0f));
+  EXPECT_EQ(SCALE_FACTOR_100P, GetScaleFactorFromScale(1.39f));
+  EXPECT_EQ(SCALE_FACTOR_180P, GetScaleFactorFromScale(1.41f));
+  EXPECT_EQ(SCALE_FACTOR_180P, GetScaleFactorFromScale(1.8f));
+  EXPECT_EQ(SCALE_FACTOR_180P, GetScaleFactorFromScale(2.0f));
+  EXPECT_EQ(SCALE_FACTOR_180P, GetScaleFactorFromScale(999.0f));
+
+  test::SetSupportedScaleFactors(original_supported_factors);
+}
+
+TEST(LayoutTest, GetScaleFactorFromScaleAllSupported) {
+  std::vector<ScaleFactor> original_supported_factors =
+      GetSupportedScaleFactors();
+
+  std::vector<ScaleFactor> supported_factors;
+  for (int factor = SCALE_FACTOR_100P; factor < NUM_SCALE_FACTORS; ++factor) {
+    supported_factors.push_back(static_cast<ScaleFactor>(factor));
+  }
+  test::SetSupportedScaleFactors(supported_factors);
+
+  EXPECT_EQ(SCALE_FACTOR_100P, GetScaleFactorFromScale(0.1f));
+  EXPECT_EQ(SCALE_FACTOR_100P, GetScaleFactorFromScale(0.9f));
+  EXPECT_EQ(SCALE_FACTOR_100P, GetScaleFactorFromScale(1.0f));
+  EXPECT_EQ(SCALE_FACTOR_100P, GetScaleFactorFromScale(1.19f));
+  EXPECT_EQ(SCALE_FACTOR_140P, GetScaleFactorFromScale(1.21f));
+  EXPECT_EQ(SCALE_FACTOR_140P, GetScaleFactorFromScale(1.3f));
+  EXPECT_EQ(SCALE_FACTOR_140P, GetScaleFactorFromScale(1.4f));
+  EXPECT_EQ(SCALE_FACTOR_140P, GetScaleFactorFromScale(1.59f));
+  EXPECT_EQ(SCALE_FACTOR_180P, GetScaleFactorFromScale(1.61f));
+  EXPECT_EQ(SCALE_FACTOR_180P, GetScaleFactorFromScale(1.7f));
+  EXPECT_EQ(SCALE_FACTOR_180P, GetScaleFactorFromScale(1.89f));
+  EXPECT_EQ(SCALE_FACTOR_200P, GetScaleFactorFromScale(1.91f));
+  EXPECT_EQ(SCALE_FACTOR_200P, GetScaleFactorFromScale(2.0f));
+  EXPECT_EQ(SCALE_FACTOR_200P, GetScaleFactorFromScale(2.1f));
+  EXPECT_EQ(SCALE_FACTOR_200P, GetScaleFactorFromScale(999.0f));
+
+  test::SetSupportedScaleFactors(original_supported_factors);
+}
+
+}  // namespace ui