Add algorithm for processing constraints for video content capture.

content/renderer/media/media_stream_constraints_util_video_content_unittest.cc

Index: content/renderer/media/media_stream_constraints_util_video_content_unittest.cc
diff --git a/content/renderer/media/media_stream_constraints_util_video_content_unittest.cc b/content/renderer/media/media_stream_constraints_util_video_content_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..212391efec04811a3328df62ac93e983c305fb07
--- /dev/null
+++ b/content/renderer/media/media_stream_constraints_util_video_content_unittest.cc
@@ -0,0 +1,1661 @@
+// Copyright 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/renderer/media/media_stream_constraints_util_video_content.h"
+
+#include <cmath>
+#include <string>
+
+#include "content/renderer/media/media_stream_video_source.h"
+#include "content/renderer/media/mock_constraint_factory.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "third_party/WebKit/public/platform/WebMediaConstraints.h"
+
+namespace content {
+
+namespace {
+
+void CheckNonResolutionDefaults(
+    const VideoContentCaptureSourceSelectionResult& result) {
+  EXPECT_EQ(MediaStreamVideoSource::kDefaultFrameRate, result.FrameRate());
+  EXPECT_EQ(rtc::Optional<bool>(), result.noise_reduction());
+  EXPECT_EQ(std::string(), result.device_id());
+}
+
+void CheckNonFrameRateDefaults(
+    const VideoContentCaptureSourceSelectionResult& result) {
+  EXPECT_EQ(MediaStreamVideoSource::kDefaultHeight, result.Height());
+  EXPECT_EQ(MediaStreamVideoSource::kDefaultWidth, result.Width());
+  EXPECT_EQ(rtc::Optional<bool>(), result.noise_reduction());
+  EXPECT_EQ(std::string(), result.device_id());
+}
+
+}  // namespace
+
+class MediaStreamConstraintsUtilVideoContentTest : public testing::Test {
+ protected:
+  VideoContentCaptureSourceSelectionResult SelectSettings() {
+    blink::WebMediaConstraints constraints =
+        constraint_factory_.CreateWebMediaConstraints();
+    return SelectVideoContentCaptureSourceSettings(constraints);
+  }
+
+  MockConstraintFactory constraint_factory_;
+};
+
+// The Unconstrained test checks the default selection criteria.
+TEST_F(MediaStreamConstraintsUtilVideoContentTest, Unconstrained) {
+  constraint_factory_.Reset();
+  auto result = SelectSettings();
+
+  // All settings should have default values.
+  EXPECT_TRUE(result.HasValue());
+  EXPECT_EQ(MediaStreamVideoSource::kDefaultHeight, result.Height());
+  EXPECT_EQ(MediaStreamVideoSource::kDefaultWidth, result.Width());
+  CheckNonResolutionDefaults(result);
+}
+
+// The "Overconstrained" tests verify that failure of any single required
+// constraint results in failure to select a candidate.
+TEST_F(MediaStreamConstraintsUtilVideoContentTest, OverconstrainedOnHeight) {
+  constraint_factory_.Reset();
+  constraint_factory_.basic().height.setExact(123467890);
+  auto result = SelectSettings();
+  EXPECT_FALSE(result.HasValue());
+  EXPECT_EQ(constraint_factory_.basic().height.name(),
+            result.failed_constraint_name());
+
+  constraint_factory_.Reset();
+  constraint_factory_.basic().height.setMin(123467890);
+  result = SelectSettings();
+  EXPECT_FALSE(result.HasValue());
+  EXPECT_EQ(constraint_factory_.basic().height.name(),
+            result.failed_constraint_name());
+
+  constraint_factory_.Reset();
+  constraint_factory_.basic().height.setMax(0);
+  result = SelectSettings();
+  EXPECT_FALSE(result.HasValue());
+  EXPECT_EQ(constraint_factory_.basic().height.name(),
+            result.failed_constraint_name());
+}
+
+TEST_F(MediaStreamConstraintsUtilVideoContentTest, OverconstrainedOnWidth) {
+  constraint_factory_.Reset();
+  constraint_factory_.basic().width.setExact(123467890);
+  auto result = SelectSettings();
+  EXPECT_FALSE(result.HasValue());
+  EXPECT_EQ(constraint_factory_.basic().width.name(),
+            result.failed_constraint_name());
+
+  constraint_factory_.Reset();
+  constraint_factory_.basic().width.setMin(123467890);
+  result = SelectSettings();
+  EXPECT_FALSE(result.HasValue());
+  EXPECT_EQ(constraint_factory_.basic().width.name(),
+            result.failed_constraint_name());
+
+  constraint_factory_.Reset();
+  constraint_factory_.basic().width.setMax(0);
+  result = SelectSettings();
+  EXPECT_FALSE(result.HasValue());
+  EXPECT_EQ(constraint_factory_.basic().width.name(),
+            result.failed_constraint_name());
+}
+
+TEST_F(MediaStreamConstraintsUtilVideoContentTest,
+       OverconstrainedOnAspectRatio) {
+  constraint_factory_.Reset();
+  constraint_factory_.basic().aspectRatio.setExact(123467890);
+  auto result = SelectSettings();
+  EXPECT_FALSE(result.HasValue());
+  EXPECT_EQ(constraint_factory_.basic().aspectRatio.name(),
+            result.failed_constraint_name());
+
+  constraint_factory_.Reset();
+  constraint_factory_.basic().aspectRatio.setMin(123467890);
+  result = SelectSettings();
+  EXPECT_FALSE(result.HasValue());
+  EXPECT_EQ(constraint_factory_.basic().aspectRatio.name(),
+            result.failed_constraint_name());
+
+  constraint_factory_.Reset();
+  constraint_factory_.basic().aspectRatio.setMax(0.00001);
+  result = SelectSettings();
+  EXPECT_FALSE(result.HasValue());
+  EXPECT_EQ(constraint_factory_.basic().aspectRatio.name(),
+            result.failed_constraint_name());
+}
+
+TEST_F(MediaStreamConstraintsUtilVideoContentTest, OverconstrainedOnFrameRate) {
+  constraint_factory_.Reset();
+  constraint_factory_.basic().frameRate.setExact(123467890.0);
+  auto result = SelectSettings();
+  EXPECT_FALSE(result.HasValue());
+  EXPECT_EQ(constraint_factory_.basic().frameRate.name(),
+            result.failed_constraint_name());
+
+  constraint_factory_.Reset();
+  constraint_factory_.basic().frameRate.setMin(123467890.0);
+  result = SelectSettings();
+  EXPECT_FALSE(result.HasValue());
+  EXPECT_EQ(constraint_factory_.basic().frameRate.name(),
+            result.failed_constraint_name());
+
+  constraint_factory_.Reset();
+  constraint_factory_.basic().frameRate.setMax(0.0);
+  result = SelectSettings();
+  EXPECT_FALSE(result.HasValue());
+  EXPECT_EQ(constraint_factory_.basic().frameRate.name(),
+            result.failed_constraint_name());
+}
+
+// The "Mandatory" and "Ideal" tests check that various selection criteria work
+// for each individual constraint in the basic constraint set.
+TEST_F(MediaStreamConstraintsUtilVideoContentTest, MandatoryDeviceID) {
+  const std::string kDeviceID = "Some ID";
+  constraint_factory_.Reset();
+  constraint_factory_.basic().deviceId.setExact(
+      blink::WebString::fromASCII(kDeviceID));
+  auto result = SelectSettings();
+  EXPECT_TRUE(result.HasValue());
+  EXPECT_EQ(kDeviceID, result.device_id());
+  // Other settings should have default values.
+  EXPECT_EQ(MediaStreamVideoSource::kDefaultHeight, result.Height());
+  EXPECT_EQ(MediaStreamVideoSource::kDefaultWidth, result.Width());
+  EXPECT_EQ(MediaStreamVideoSource::kDefaultFrameRate, result.FrameRate());
+  EXPECT_EQ(rtc::Optional<bool>(), result.noise_reduction());
+}
+
+TEST_F(MediaStreamConstraintsUtilVideoContentTest, IdealDeviceID) {
+  const std::string kDeviceID = "Some ID";
+  const std::string kIdealID = "Ideal ID";
+  blink::WebVector<blink::WebString> device_ids(static_cast<size_t>(2));
+  device_ids[0] = blink::WebString::fromASCII(kDeviceID);
+  device_ids[1] = blink::WebString::fromASCII(kIdealID);
+  constraint_factory_.Reset();
+  constraint_factory_.basic().deviceId.setExact(device_ids);
+
+  blink::WebVector<blink::WebString> ideal_id(static_cast<size_t>(1));
+  ideal_id[0] = blink::WebString::fromASCII(kIdealID);
+  constraint_factory_.basic().deviceId.setIdeal(ideal_id);
+
+  auto result = SelectSettings();
+  EXPECT_TRUE(result.HasValue());
+  EXPECT_EQ(kIdealID, result.device_id());
+  // Other settings should have default values.
+  EXPECT_EQ(MediaStreamVideoSource::kDefaultHeight, result.Height());
+  EXPECT_EQ(MediaStreamVideoSource::kDefaultWidth, result.Width());
+  EXPECT_EQ(MediaStreamVideoSource::kDefaultFrameRate, result.FrameRate());
+  EXPECT_EQ(rtc::Optional<bool>(), result.noise_reduction());
+}
+
+TEST_F(MediaStreamConstraintsUtilVideoContentTest, MandatoryNoiseReduction) {
+  constraint_factory_.Reset();
+  const bool kNoiseReductionValues[] = {true, false};
+  for (auto noise_reduction : kNoiseReductionValues) {
+    constraint_factory_.basic().googNoiseReduction.setExact(noise_reduction);
+    auto result = SelectSettings();
+    EXPECT_TRUE(result.HasValue());
+    EXPECT_EQ(noise_reduction, result.noise_reduction());
+    // Other settings should have default values.
+    EXPECT_EQ(MediaStreamVideoSource::kDefaultHeight, result.Height());
+    EXPECT_EQ(MediaStreamVideoSource::kDefaultWidth, result.Width());
+    EXPECT_EQ(MediaStreamVideoSource::kDefaultFrameRate, result.FrameRate());
+    EXPECT_EQ(std::string(), result.device_id());
+  }
+}
+
+TEST_F(MediaStreamConstraintsUtilVideoContentTest, IdealNoiseReduction) {
+  constraint_factory_.Reset();
+  const bool kNoiseReductionValues[] = {true, false};
+  for (auto noise_reduction : kNoiseReductionValues) {
+    constraint_factory_.basic().googNoiseReduction.setIdeal(noise_reduction);
+    auto result = SelectSettings();
+    EXPECT_TRUE(result.HasValue());
+    EXPECT_EQ(noise_reduction, result.noise_reduction());
+    // Other settings should have default values.
+    EXPECT_EQ(MediaStreamVideoSource::kDefaultHeight, result.Height());
+    EXPECT_EQ(MediaStreamVideoSource::kDefaultWidth, result.Width());
+    EXPECT_EQ(MediaStreamVideoSource::kDefaultFrameRate, result.FrameRate());
+    EXPECT_EQ(std::string(), result.device_id());
+  }
+}
+
+TEST_F(MediaStreamConstraintsUtilVideoContentTest, MandatoryExactHeight) {
+  constraint_factory_.Reset();
+  const int kHeight = 1000;
+  constraint_factory_.basic().height.setExact(kHeight);
+  auto result = SelectSettings();
+  EXPECT_TRUE(result.HasValue());
+  EXPECT_EQ(kHeight, result.Height());
+  // The algorithm tries to preserve the default aspect ratio.
+  EXPECT_EQ(std::round(kHeight * MediaStreamVideoSource::kDefaultAspectRatio),
+            result.Width());
+  CheckNonResolutionDefaults(result);
+}
+
+TEST_F(MediaStreamConstraintsUtilVideoContentTest, MandatoryMinHeight) {
+  constraint_factory_.Reset();
+  const int kHeight = 1000;
+  constraint_factory_.basic().height.setMin(kHeight);
+  auto result = SelectSettings();
+  EXPECT_TRUE(result.HasValue());
+  // kHeight is greater that the default, so expect kHeight.
+  EXPECT_EQ(kHeight, result.Height());
+  EXPECT_EQ(std::round(kHeight * MediaStreamVideoSource::kDefaultAspectRatio),
+            result.Width());
+  CheckNonResolutionDefaults(result);
+
+  const int kSmallHeight = 100;
+  constraint_factory_.basic().height.setMin(kSmallHeight);
+  result = SelectSettings();
+  EXPECT_TRUE(result.HasValue());
+  // kSmallHeight is less that the default, so expect the default.
+  EXPECT_EQ(MediaStreamVideoSource::kDefaultHeight, result.Height());
+  EXPECT_EQ(MediaStreamVideoSource::kDefaultWidth, result.Width());
+  CheckNonResolutionDefaults(result);
+}
+
+TEST_F(MediaStreamConstraintsUtilVideoContentTest, MandatoryMaxHeight) {
+  constraint_factory_.Reset();
+  const int kHeight = 1000;
+  constraint_factory_.basic().height.setMax(kHeight);
+  auto result = SelectSettings();
+  EXPECT_TRUE(result.HasValue());
+  // kHeight is greater that the default, so expect the default.
+  EXPECT_EQ(MediaStreamVideoSource::kDefaultHeight, result.Height());
+  EXPECT_EQ(MediaStreamVideoSource::kDefaultWidth, result.Width());
+  CheckNonResolutionDefaults(result);
+
+  const int kSmallHeight = 100;
+  constraint_factory_.basic().height.setMax(kSmallHeight);
+  result = SelectSettings();
+  EXPECT_TRUE(result.HasValue());
+  // kSmallHeight is less that the default, so expect kSmallHeight.
+  EXPECT_EQ(kSmallHeight, result.Height());
+  EXPECT_EQ(
+      std::round(kSmallHeight * MediaStreamVideoSource::kDefaultAspectRatio),
+      result.Width());
+  CheckNonResolutionDefaults(result);
+}
+
+TEST_F(MediaStreamConstraintsUtilVideoContentTest, MandatoryHeightRange) {
+  constraint_factory_.Reset();
+  {
+    const int kMinHeight = 300;
+    const int kMaxHeight = 1000;
+    constraint_factory_.basic().height.setMin(kMinHeight);
+    constraint_factory_.basic().height.setMax(kMaxHeight);
+    auto result = SelectSettings();
+    EXPECT_TRUE(result.HasValue());
+    // The range includes the default, so expect the default.
+    EXPECT_EQ(MediaStreamVideoSource::kDefaultHeight, result.Height());
+    EXPECT_EQ(MediaStreamVideoSource::kDefaultWidth, result.Width());
+    CheckNonResolutionDefaults(result);
+  }
+
+  {
+    const int kMinHeight = 900;
+    const int kMaxHeight = 1000;
+    constraint_factory_.basic().height.setMin(kMinHeight);
+    constraint_factory_.basic().height.setMax(kMaxHeight);
+    auto result = SelectSettings();
+    EXPECT_TRUE(result.HasValue());
+    // The whole range is greater than the default, so expect the range minimum.
+    EXPECT_EQ(kMinHeight, result.Height());
+    EXPECT_EQ(
+        std::round(kMinHeight * MediaStreamVideoSource::kDefaultAspectRatio),
+        result.Width());
+    CheckNonResolutionDefaults(result);
+  }
+
+  {
+    const int kMinHeight = 300;
+    const int kMaxHeight = 400;
+    constraint_factory_.basic().height.setMin(kMinHeight);
+    constraint_factory_.basic().height.setMax(kMaxHeight);
+    auto result = SelectSettings();
+    EXPECT_TRUE(result.HasValue());
+    // The whole range is less than the default, so expect the range maximum.
+    EXPECT_EQ(kMaxHeight, result.Height());
+    EXPECT_EQ(
+        std::round(kMaxHeight * MediaStreamVideoSource::kDefaultAspectRatio),
+        result.Width());
+    CheckNonResolutionDefaults(result);
+  }
+}
+
+TEST_F(MediaStreamConstraintsUtilVideoContentTest, IdealHeight) {
+  // Unconstrained.
+  {
+    constraint_factory_.Reset();
+    const int kIdealHeight = 1000;
+    constraint_factory_.basic().height.setIdeal(kIdealHeight);
+    auto result = SelectSettings();
+    EXPECT_TRUE(result.HasValue());
+    EXPECT_EQ(kIdealHeight, result.Height());
+    // When ideal height is given, the algorithm returns a width that is closest
+    // to height * kDefaultAspectRatio.
+    EXPECT_EQ(
+        std::round(kIdealHeight * MediaStreamVideoSource::kDefaultAspectRatio),
+        result.Width());
+    CheckNonResolutionDefaults(result);
+  }
+
+  // Ideal greater than maximum.
+  {
+    constraint_factory_.Reset();
+    const int kIdealHeight = 1000;
+    const int kMaxHeight = 800;
+    constraint_factory_.basic().height.setIdeal(kIdealHeight);
+    constraint_factory_.basic().height.setMax(kMaxHeight);
+    auto result = SelectSettings();
+    EXPECT_TRUE(result.HasValue());
+    // Ideal height is greater than the maximum, expect maximum.
+    EXPECT_EQ(kMaxHeight, result.Height());
+    // Expect closest to kMaxHeight * kDefaultAspectRatio.
+    EXPECT_EQ(
+        std::round(kMaxHeight * MediaStreamVideoSource::kDefaultAspectRatio),
+        result.Width());
+    CheckNonResolutionDefaults(result);
+  }
+
+  // Ideal less than minimum.
+  {
+    constraint_factory_.Reset();
+    const int kIdealHeight = 1000;
+    const int kMinHeight = 1200;
+    constraint_factory_.basic().height.setIdeal(kIdealHeight);
+    constraint_factory_.basic().height.setMin(kMinHeight);
+    auto result = SelectSettings();
+    EXPECT_TRUE(result.HasValue());
+    // Ideal height is less than the minimum, expect minimum.
+    EXPECT_EQ(kMinHeight, result.Height());
+    // Expect closest to kMinHeight * kDefaultAspectRatio.
+    EXPECT_EQ(
+        std::round(kMinHeight * MediaStreamVideoSource::kDefaultAspectRatio),
+        result.Width());
+    CheckNonResolutionDefaults(result);
+  }
+
+  // Ideal intersects a box.
+  {
+    constraint_factory_.Reset();
+    constraint_factory_.basic().height.setMin(500);
+    constraint_factory_.basic().height.setMax(1000);
+    constraint_factory_.basic().width.setMin(100);
+    constraint_factory_.basic().width.setMax(500);
+    const int kIdealHeight = 750;
+    constraint_factory_.basic().height.setIdeal(kIdealHeight);
+    auto result = SelectSettings();
+    EXPECT_TRUE(result.HasValue());
+    // Ideal height is included in the bounding box.
+    EXPECT_EQ(kIdealHeight, result.Height());
+    // Expect width closest to kIdealHeight * kDefaultAspectRatio, which is
+    // outside the box. Closest is max width.
+    EXPECT_EQ(constraint_factory_.basic().width.max(), result.Width());
+    CheckNonResolutionDefaults(result);
+
+    constraint_factory_.basic().width.setMin(1200);
+    constraint_factory_.basic().width.setMax(2000);
+    result = SelectSettings();
+    EXPECT_TRUE(result.HasValue());
+    EXPECT_EQ(kIdealHeight, result.Height());
+    // kIdealHeight * kDefaultAspectRatio is outside the box. Closest is
+    // min width.
+    EXPECT_EQ(constraint_factory_.basic().width.min(), result.Width());
+    CheckNonResolutionDefaults(result);
+
+    constraint_factory_.basic().width.setMin(100);
+    constraint_factory_.basic().width.setMax(500);
+    result = SelectSettings();
+    EXPECT_TRUE(result.HasValue());
+    EXPECT_EQ(kIdealHeight, result.Height());
+    // kIdealHeight * kDefaultAspectRatio is outside the box. Closest is
+    // max width.
+    EXPECT_EQ(constraint_factory_.basic().width.max(), result.Width());
+    CheckNonResolutionDefaults(result);
+  }
+
+  // Ideal outside the box, closest to the side coinciding with max height.
+  {
+    const int kMaxHeight = 1000;
+    constraint_factory_.Reset();
+    constraint_factory_.basic().height.setMin(500);
+    constraint_factory_.basic().height.setMax(kMaxHeight);
+    constraint_factory_.basic().width.setMin(100);
+    constraint_factory_.basic().width.setMax(500);
+    constraint_factory_.basic().height.setIdeal(1200);
+    auto result = SelectSettings();
+    EXPECT_TRUE(result.HasValue());
+    EXPECT_EQ(kMaxHeight, result.Height());
+    // Expect width closest to kMaxHeight * kDefaultAspectRatio, which is
+    // outside the box. Closest it max width.
+    EXPECT_EQ(constraint_factory_.basic().width.max(), result.Width());
+    CheckNonResolutionDefaults(result);
+
+    constraint_factory_.basic().width.setMin(1500);
+    constraint_factory_.basic().width.setMax(2000);
+    result = SelectSettings();
+    EXPECT_TRUE(result.HasValue());
+    EXPECT_EQ(kMaxHeight, result.Height());
+    // kMaxHeight * kDefaultAspectRatio is outside the box. Closest is min
+    // width.
+    EXPECT_EQ(constraint_factory_.basic().width.min(), result.Width());
+    CheckNonResolutionDefaults(result);
+
+    constraint_factory_.basic().width.setMin(100);
+    result = SelectSettings();
+    EXPECT_TRUE(result.HasValue());
+    EXPECT_EQ(kMaxHeight, result.Height());
+    // kMaxHeight * kDefaultAspectRatio is within the width limits.
+    EXPECT_EQ(
+        std::round(kMaxHeight * MediaStreamVideoSource::kDefaultAspectRatio),
+        result.Width());
+    CheckNonResolutionDefaults(result);
+  }
+
+  // Ideal outside the constrained set, closest to a single point.
+  {
+    constraint_factory_.Reset();
+    constraint_factory_.basic().height.setMin(500);
+    constraint_factory_.basic().height.setMax(1000);
+    constraint_factory_.basic().width.setMin(500);
+    constraint_factory_.basic().width.setMax(1000);
+    constraint_factory_.basic().aspectRatio.setMin(1.0);
+    constraint_factory_.basic().height.setIdeal(1200);
+    auto result = SelectSettings();
+    EXPECT_TRUE(result.HasValue());
+    // (max-height, max-width) is the single point closest to the ideal line.
+    EXPECT_EQ(constraint_factory_.basic().height.max(), result.Height());
+    EXPECT_EQ(constraint_factory_.basic().width.max(), result.Width());
+    CheckNonResolutionDefaults(result);
+  }
+}
+
+TEST_F(MediaStreamConstraintsUtilVideoContentTest, MandatoryExactWidth) {
+  constraint_factory_.Reset();
+  const int kWidth = 1000;
+  constraint_factory_.basic().width.setExact(kWidth);
+  auto result = SelectSettings();
+  EXPECT_TRUE(result.HasValue());
+  EXPECT_EQ(kWidth, result.Width());
+  EXPECT_EQ(std::round(kWidth / MediaStreamVideoSource::kDefaultAspectRatio),
+            result.Height());
+  CheckNonResolutionDefaults(result);
+}
+
+TEST_F(MediaStreamConstraintsUtilVideoContentTest, MandatoryMinWidth) {
+  constraint_factory_.Reset();
+  const int kWidth = 1000;
+  constraint_factory_.basic().width.setMin(kWidth);
+  auto result = SelectSettings();
+  EXPECT_TRUE(result.HasValue());
+  // kWidth is greater that the default, so expect kWidth.
+  EXPECT_EQ(kWidth, result.Width());
+  EXPECT_EQ(std::round(kWidth / MediaStreamVideoSource::kDefaultAspectRatio),
+            result.Height());
+  CheckNonResolutionDefaults(result);
+
+  const int kSmallWidth = 100;
+  constraint_factory_.basic().width.setMin(kSmallWidth);
+  result = SelectSettings();
+  EXPECT_TRUE(result.HasValue());
+  // kSmallWidth is less that the default, so expect the default.
+  EXPECT_EQ(MediaStreamVideoSource::kDefaultWidth, result.Width());
+  EXPECT_EQ(MediaStreamVideoSource::kDefaultHeight, result.Height());
+  CheckNonResolutionDefaults(result);
+}
+
+TEST_F(MediaStreamConstraintsUtilVideoContentTest, MandatoryMaxWidth) {
+  constraint_factory_.Reset();
+  const int kWidth = 1000;
+  constraint_factory_.basic().width.setMax(kWidth);
+  auto result = SelectSettings();
+  EXPECT_TRUE(result.HasValue());
+  // kWidth is greater that the default, so expect the default.
+  EXPECT_EQ(MediaStreamVideoSource::kDefaultWidth, result.Width());
+  EXPECT_EQ(MediaStreamVideoSource::kDefaultHeight, result.Height());
+  CheckNonResolutionDefaults(result);
+
+  const int kSmallWidth = 100;
+  constraint_factory_.basic().width.setMax(kSmallWidth);
+  result = SelectSettings();
+  EXPECT_TRUE(result.HasValue());
+  // kSmallWidth is less that the default, so expect kSmallWidth.
+  EXPECT_EQ(kSmallWidth, result.Width());
+  EXPECT_EQ(
+      std::round(kSmallWidth / MediaStreamVideoSource::kDefaultAspectRatio),
+      result.Height());
+  CheckNonResolutionDefaults(result);
+}
+
+TEST_F(MediaStreamConstraintsUtilVideoContentTest, MandatoryWidthRange) {
+  constraint_factory_.Reset();
+  {
+    const int kMinWidth = 300;
+    const int kMaxWidth = 1000;
+    constraint_factory_.basic().width.setMin(kMinWidth);
+    constraint_factory_.basic().width.setMax(kMaxWidth);
+    auto result = SelectSettings();
+    EXPECT_TRUE(result.HasValue());
+    // The range includes the default, so expect the default.
+    EXPECT_EQ(MediaStreamVideoSource::kDefaultWidth, result.Width());
+    EXPECT_EQ(MediaStreamVideoSource::kDefaultHeight, result.Height());
+    CheckNonResolutionDefaults(result);
+  }
+
+  {
+    const int kMinWidth = 900;
+    const int kMaxWidth = 1000;
+    constraint_factory_.basic().width.setMin(kMinWidth);
+    constraint_factory_.basic().width.setMax(kMaxWidth);
+    auto result = SelectSettings();
+    EXPECT_TRUE(result.HasValue());
+    // The whole range is greater than the default, so expect the range minimum.
+    EXPECT_EQ(kMinWidth, result.Width());
+    EXPECT_EQ(
+        std::round(kMinWidth / MediaStreamVideoSource::kDefaultAspectRatio),
+        result.Height());
+    CheckNonResolutionDefaults(result);
+  }
+
+  {
+    const int kMinWidth = 300;
+    const int kMaxWidth = 400;
+    constraint_factory_.basic().width.setMin(kMinWidth);
+    constraint_factory_.basic().width.setMax(kMaxWidth);
+    auto result = SelectSettings();
+    EXPECT_TRUE(result.HasValue());
+    // The whole range is less than the default, so expect the range maximum.
+    EXPECT_EQ(kMaxWidth, result.Width());
+    EXPECT_EQ(
+        std::round(kMaxWidth / MediaStreamVideoSource::kDefaultAspectRatio),
+        result.Height());
+    CheckNonResolutionDefaults(result);
+  }
+}
+
+TEST_F(MediaStreamConstraintsUtilVideoContentTest, IdealWidth) {
+  // Unconstrained
+  {
+    constraint_factory_.Reset();
+    const int kIdealWidth = 1000;
+    constraint_factory_.basic().width.setIdeal(kIdealWidth);
+    auto result = SelectSettings();
+    EXPECT_TRUE(result.HasValue());
+    EXPECT_EQ(kIdealWidth, result.Width());
+    // When ideal width is given, the algorithm returns a height that is closest
+    // to width / kDefaultAspectRatio.
+    EXPECT_EQ(
+        std::round(kIdealWidth / MediaStreamVideoSource::kDefaultAspectRatio),
+        result.Height());
+    CheckNonResolutionDefaults(result);
+  }
+
+  // Ideal greater than maximum.
+  {
+    constraint_factory_.Reset();
+    const int kIdealWidth = 1000;
+    const int kMaxWidth = 800;
+    constraint_factory_.basic().width.setIdeal(kIdealWidth);
+    constraint_factory_.basic().width.setMax(kMaxWidth);
+    auto result = SelectSettings();
+    EXPECT_TRUE(result.HasValue());
+    EXPECT_EQ(kMaxWidth, result.Width());
+    // Expect closest to kMaxWidth / kDefaultAspectRatio.
+    EXPECT_EQ(
+        std::round(kMaxWidth / MediaStreamVideoSource::kDefaultAspectRatio),
+        result.Height());
+    CheckNonResolutionDefaults(result);
+  }
+
+  // Ideal less than minimum.
+  {
+    constraint_factory_.Reset();
+    const int kIdealWidth = 1000;
+    const int kMinWidth = 1200;
+    constraint_factory_.basic().width.setIdeal(kIdealWidth);
+    constraint_factory_.basic().width.setMin(kMinWidth);
+    auto result = SelectSettings();
+    EXPECT_TRUE(result.HasValue());
+    EXPECT_EQ(kMinWidth, result.Width());
+    // Expect closest to kMinWidth / kDefaultAspectRatio.
+    EXPECT_EQ(
+        std::round(kMinWidth / MediaStreamVideoSource::kDefaultAspectRatio),
+        result.Height());
+    CheckNonResolutionDefaults(result);
+  }
+
+  // Ideal intersects a box.
+  {
+    constraint_factory_.Reset();
+    constraint_factory_.basic().width.setMin(500);
+    constraint_factory_.basic().width.setMax(1000);
+    constraint_factory_.basic().height.setMin(100);
+    constraint_factory_.basic().height.setMax(500);
+    const int kIdealWidth = 750;
+    constraint_factory_.basic().width.setIdeal(kIdealWidth);
+    auto result = SelectSettings();
+    EXPECT_TRUE(result.HasValue());
+    // Ideal width is included in the bounding box.
+    EXPECT_EQ(kIdealWidth, result.Width());
+    // Expect height closest to kIdealWidth / kDefaultAspectRatio, which is
+    // outside the box. Closest is max height.
+    EXPECT_EQ(constraint_factory_.basic().height.max(), result.Height());
+    CheckNonResolutionDefaults(result);
+
+    constraint_factory_.basic().height.setMin(1200);
+    constraint_factory_.basic().height.setMax(2000);
+    result = SelectSettings();
+    EXPECT_TRUE(result.HasValue());
+    EXPECT_EQ(kIdealWidth, result.Width());
+    // kIdealWidth / kDefaultAspectRatio outside the box. Closest is
+    // min height.
+    EXPECT_EQ(constraint_factory_.basic().height.min(), result.Height());
+    CheckNonResolutionDefaults(result);
+
+    constraint_factory_.basic().height.setMin(100);
+    constraint_factory_.basic().height.setMax(500);
+    result = SelectSettings();
+    EXPECT_TRUE(result.HasValue());
+    EXPECT_EQ(kIdealWidth, result.Width());
+    // kIdealWidth / kDefaultAspectRatio is outside the box. Closest is max
+    // height.
+    EXPECT_EQ(constraint_factory_.basic().height.max(), result.Height());
+    CheckNonResolutionDefaults(result);
+  }
+
+  // Ideal outside the box, closest to the side coinciding with max width.
+  {
+    const int kMaxWidth = 1000;
+    constraint_factory_.Reset();
+    constraint_factory_.basic().width.setMin(500);
+    constraint_factory_.basic().width.setMax(kMaxWidth);
+    constraint_factory_.basic().height.setMin(100);
+    constraint_factory_.basic().height.setMax(500);
+    constraint_factory_.basic().width.setIdeal(1200);
+    auto result = SelectSettings();
+    EXPECT_TRUE(result.HasValue());
+    EXPECT_EQ(kMaxWidth, result.Width());
+    // kMaxWidth / kDefaultAspectRatio is outside the box. Closest is max
+    // height.
+    EXPECT_EQ(constraint_factory_.basic().height.max(), result.Height());
+    CheckNonResolutionDefaults(result);
+
+    constraint_factory_.basic().height.setMin(1500);
+    constraint_factory_.basic().height.setMax(2000);
+    result = SelectSettings();
+    EXPECT_TRUE(result.HasValue());
+    EXPECT_EQ(kMaxWidth, result.Width());
+    // kMaxWidth / kDefaultAspectRatio is outside the box. Closest is
+    // min height.
+    EXPECT_EQ(constraint_factory_.basic().height.min(), result.Height());
+    CheckNonResolutionDefaults(result);
+
+    constraint_factory_.basic().height.setMin(100);
+    result = SelectSettings();
+    EXPECT_TRUE(result.HasValue());
+    EXPECT_EQ(kMaxWidth, result.Width());
+    // kMaxWidth / kDefaultAspectRatio is within the height limits.
+    EXPECT_EQ(
+        std::round(kMaxWidth / MediaStreamVideoSource::kDefaultAspectRatio),
+        result.Height());
+    CheckNonResolutionDefaults(result);
+  }
+
+  // Ideal outside the constrained set, closest to a single point.
+  {
+    constraint_factory_.Reset();
+    constraint_factory_.basic().width.setMin(100);
+    constraint_factory_.basic().width.setMax(500);
+    constraint_factory_.basic().height.setMin(100);
+    constraint_factory_.basic().height.setMax(500);
+    constraint_factory_.basic().aspectRatio.setMax(1.0);
+    constraint_factory_.basic().width.setIdeal(1200);
+    auto result = SelectSettings();
+    EXPECT_TRUE(result.HasValue());
+    // (max-width, max-height) is the single point closest to the ideal line.
+    EXPECT_EQ(constraint_factory_.basic().width.max(), result.Width());
+    EXPECT_EQ(constraint_factory_.basic().height.max(), result.Height());
+    CheckNonResolutionDefaults(result);
+  }
+}
+
+TEST_F(MediaStreamConstraintsUtilVideoContentTest, MandatoryExactAspectRatio) {
+  constraint_factory_.Reset();
+  const double kAspectRatio = 2.0;
+  constraint_factory_.basic().aspectRatio.setExact(kAspectRatio);
+  auto result = SelectSettings();
+  EXPECT_TRUE(result.HasValue());
+  // Given that the default aspect ratio cannot be preserved, the algorithm
+  // tries to preserve, among the default height or width, the one that leads
+  // to highest area. In this case, height is preserved.
+  EXPECT_EQ(MediaStreamVideoSource::kDefaultHeight, result.Height());
+  EXPECT_EQ(std::round(MediaStreamVideoSource::kDefaultHeight * kAspectRatio),
+            result.Width());
+  CheckNonResolutionDefaults(result);
+}
+
+TEST_F(MediaStreamConstraintsUtilVideoContentTest, MandatoryMinAspectRatio) {
+  constraint_factory_.Reset();
+  const double kAspectRatio = 2.0;
+  constraint_factory_.basic().aspectRatio.setMin(kAspectRatio);
+  auto result = SelectSettings();
+  EXPECT_TRUE(result.HasValue());
+  // kAspectRatio is greater that the default, so expect kAspectRatio.
+  EXPECT_EQ(MediaStreamVideoSource::kDefaultHeight, result.Height());
+  EXPECT_EQ(std::round(MediaStreamVideoSource::kDefaultHeight * kAspectRatio),
+            result.Width());
+  CheckNonResolutionDefaults(result);
+
+  const double kSmallAspectRatio = 0.5;
+  constraint_factory_.basic().aspectRatio.setMin(kSmallAspectRatio);
+  result = SelectSettings();
+  EXPECT_TRUE(result.HasValue());
+  // kSmallAspectRatio is less that the default, so expect the default.
+  EXPECT_EQ(MediaStreamVideoSource::kDefaultHeight, result.Height());
+  EXPECT_EQ(MediaStreamVideoSource::kDefaultWidth, result.Width());
+  CheckNonResolutionDefaults(result);
+}
+
+TEST_F(MediaStreamConstraintsUtilVideoContentTest, MandatoryMaxAspectRatio) {
+  constraint_factory_.Reset();
+  const double kAspectRatio = 2.0;
+  constraint_factory_.basic().aspectRatio.setMax(kAspectRatio);
+  auto result = SelectSettings();
+  EXPECT_TRUE(result.HasValue());
+  // kAspectRatio is greater that the default, so expect the default.
+  EXPECT_EQ(MediaStreamVideoSource::kDefaultHeight, result.Height());
+  EXPECT_EQ(MediaStreamVideoSource::kDefaultWidth, result.Width());
+  CheckNonResolutionDefaults(result);
+
+  const double kSmallAspectRatio = 0.5;
+  constraint_factory_.basic().aspectRatio.setMax(kSmallAspectRatio);
+  result = SelectSettings();
+  EXPECT_TRUE(result.HasValue());
+  // kSmallAspectRatio is less that the default, so expect kSmallAspectRatio.
+  // Prefer to preserve default width since that leads to larger area than
+  // preserving default height.
+  EXPECT_EQ(
+      std::round(MediaStreamVideoSource::kDefaultWidth / kSmallAspectRatio),
+      result.Height());
+  EXPECT_EQ(MediaStreamVideoSource::kDefaultWidth, result.Width());
+  CheckNonResolutionDefaults(result);
+}
+
+TEST_F(MediaStreamConstraintsUtilVideoContentTest, MandatoryRangeAspectRatio) {
+  constraint_factory_.Reset();
+  {
+    const double kMinAspectRatio = 0.5;
+    const double kMaxAspectRatio = 2.0;
+    constraint_factory_.basic().aspectRatio.setMin(kMinAspectRatio);
+    constraint_factory_.basic().aspectRatio.setMax(kMaxAspectRatio);
+    auto result = SelectSettings();
+    EXPECT_TRUE(result.HasValue());
+    // Range includes default, so expect the default.
+    EXPECT_EQ(MediaStreamVideoSource::kDefaultHeight, result.Height());
+    EXPECT_EQ(MediaStreamVideoSource::kDefaultWidth, result.Width());
+    CheckNonResolutionDefaults(result);
+  }
+
+  {
+    const double kMinAspectRatio = 2.0;
+    const double kMaxAspectRatio = 3.0;
+    constraint_factory_.basic().aspectRatio.setMin(kMinAspectRatio);
+    constraint_factory_.basic().aspectRatio.setMax(kMaxAspectRatio);
+    auto result = SelectSettings();
+    EXPECT_TRUE(result.HasValue());
+    // The whole range is greater than the default. Expect the minimum.
+    EXPECT_EQ(MediaStreamVideoSource::kDefaultHeight, result.Height());
+    EXPECT_EQ(
+        std::round(MediaStreamVideoSource::kDefaultHeight * kMinAspectRatio),
+        result.Width());
+    CheckNonResolutionDefaults(result);
+  }
+
+  {
+    const double kMinAspectRatio = 0.5;
+    const double kMaxAspectRatio = 1.0;
+    constraint_factory_.basic().aspectRatio.setMin(kMinAspectRatio);
+    constraint_factory_.basic().aspectRatio.setMax(kMaxAspectRatio);
+    auto result = SelectSettings();
+    EXPECT_TRUE(result.HasValue());
+    // The whole range is less than the default. Expect the maximum.
+    EXPECT_EQ(
+        std::round(MediaStreamVideoSource::kDefaultWidth / kMaxAspectRatio),
+        result.Height());
+    EXPECT_EQ(MediaStreamVideoSource::kDefaultWidth, result.Width());
+    CheckNonResolutionDefaults(result);
+  }
+}
+
+TEST_F(MediaStreamConstraintsUtilVideoContentTest, IdealAspectRatio) {
+  // Unconstrained.
+  {
+    constraint_factory_.Reset();
+    const double kIdealAspectRatio = 2.0;
+    constraint_factory_.basic().aspectRatio.setIdeal(kIdealAspectRatio);
+    auto result = SelectSettings();
+    EXPECT_TRUE(result.HasValue());
+    EXPECT_EQ(MediaStreamVideoSource::kDefaultHeight, result.Height());
+    EXPECT_EQ(
+        std::round(MediaStreamVideoSource::kDefaultHeight * kIdealAspectRatio),
+        result.Width());
+    CheckNonResolutionDefaults(result);
+  }
+
+  // Ideal greater than maximum.
+  {
+    constraint_factory_.Reset();
+    const double kIdealAspectRatio = 2.0;
+    const double kMaxAspectRatio = 1.5;
+    constraint_factory_.basic().aspectRatio.setIdeal(kIdealAspectRatio);
+    constraint_factory_.basic().aspectRatio.setMax(kMaxAspectRatio);
+    auto result = SelectSettings();
+    EXPECT_TRUE(result.HasValue());
+    // Ideal height is greater than the maximum, expect maximum.
+    EXPECT_EQ(MediaStreamVideoSource::kDefaultHeight, result.Height());
+    EXPECT_EQ(
+        std::round(MediaStreamVideoSource::kDefaultHeight * kMaxAspectRatio),
+        result.Width());
+    CheckNonResolutionDefaults(result);
+  }
+
+  // Ideal less than minimum.
+  {
+    constraint_factory_.Reset();
+    const double kIdealAspectRatio = 1.0;
+    const double kMinAspectRatio = 1.5;
+    constraint_factory_.basic().aspectRatio.setIdeal(kIdealAspectRatio);
+    constraint_factory_.basic().aspectRatio.setMin(kMinAspectRatio);
+    auto result = SelectSettings();
+    EXPECT_TRUE(result.HasValue());
+    // Ideal height is greater than the maximum, expect maximum.
+    EXPECT_EQ(MediaStreamVideoSource::kDefaultHeight, result.Height());
+    EXPECT_EQ(
+        std::round(MediaStreamVideoSource::kDefaultHeight * kMinAspectRatio),
+        result.Width());
+    CheckNonResolutionDefaults(result);
+  }
+
+  // Ideal intersects a box.
+  {
+    constraint_factory_.Reset();
+    constraint_factory_.basic().height.setMin(100);
+    constraint_factory_.basic().height.setMax(500);
+    constraint_factory_.basic().width.setMin(100);
+    constraint_factory_.basic().width.setMax(500);
+    const int kIdealAspectRatio = 2.0;
+    constraint_factory_.basic().aspectRatio.setIdeal(kIdealAspectRatio);
+    auto result = SelectSettings();
+    EXPECT_TRUE(result.HasValue());
+    // Ideal aspect-ratio is included in the bounding box, with the value
+    // closest to a standard width or height being the cut with the maximum
+    // width.
+    EXPECT_EQ(
+        std::round(constraint_factory_.basic().width.max() / kIdealAspectRatio),
+        result.Height());
+    EXPECT_EQ(constraint_factory_.basic().width.max(), result.Width());
+    CheckNonResolutionDefaults(result);
+
+    constraint_factory_.basic().height.setMin(1000);
+    constraint_factory_.basic().height.setMax(5000);
+    constraint_factory_.basic().width.setMin(1000);
+    constraint_factory_.basic().width.setMax(5000);
+    result = SelectSettings();
+    EXPECT_TRUE(result.HasValue());
+    // Ideal aspect-ratio is included in the bounding box, with the value
+    // closest to a standard width or height and largest area being the cut with
+    // the minimum height.
+    EXPECT_EQ(constraint_factory_.basic().height.min(), result.Height());
+    EXPECT_EQ(std::round(constraint_factory_.basic().height.min() *
+                         kIdealAspectRatio),
+              result.Width());
+    CheckNonResolutionDefaults(result);
+
+    constraint_factory_.basic().height.setMin(250);
+    constraint_factory_.basic().height.setMax(5000);
+    constraint_factory_.basic().width.setMin(250);
+    constraint_factory_.basic().width.setMax(5000);
+    result = SelectSettings();
+    EXPECT_TRUE(result.HasValue());
+    // Ideal aspect-ratio and default width and height are included in the
+    // bounding box. Preserving default height leads to larger area than
+    // preserving default width.
+    EXPECT_EQ(MediaStreamVideoSource::kDefaultHeight, result.Height());
+    EXPECT_EQ(MediaStreamVideoSource::kDefaultHeight * kIdealAspectRatio,
+              result.Width());
+    CheckNonResolutionDefaults(result);
+  }
+
+  // Ideal outside the constrained area, closest to min or max aspect ratio.
+  {
+    const double kMinAspectRatio = 0.5;
+    const double kMaxAspectRatio = 2.0;
+    constraint_factory_.Reset();
+    constraint_factory_.basic().height.setMin(100);
+    constraint_factory_.basic().height.setMax(500);
+    constraint_factory_.basic().width.setMin(100);
+    constraint_factory_.basic().width.setMax(500);
+    constraint_factory_.basic().aspectRatio.setMin(kMinAspectRatio);
+    constraint_factory_.basic().aspectRatio.setMax(kMaxAspectRatio);
+    constraint_factory_.basic().aspectRatio.setIdeal(3.0);
+    auto result = SelectSettings();
+    EXPECT_TRUE(result.HasValue());
+    // Ideal is closest to kMaxAspectRatio.
+    EXPECT_EQ(
+        std::round(constraint_factory_.basic().width.max() / kMaxAspectRatio),
+        result.Height());
+    EXPECT_EQ(constraint_factory_.basic().width.max(), result.Width());
+    CheckNonResolutionDefaults(result);
+
+    constraint_factory_.basic().aspectRatio.setIdeal(0.3);
+    result = SelectSettings();
+    EXPECT_TRUE(result.HasValue());
+    // Ideal is closest to kMinAspectRatio.
+    EXPECT_EQ(constraint_factory_.basic().height.max(), result.Height());
+    EXPECT_EQ(
+        std::round(constraint_factory_.basic().height.max() * kMinAspectRatio),
+        result.Width());
+    CheckNonResolutionDefaults(result);
+
+    // Use a box that is bigger and further from the origin to force closeness
+    // to a different default dimension.
+    constraint_factory_.basic().height.setMin(1000);
+    constraint_factory_.basic().height.setMax(5000);
+    constraint_factory_.basic().width.setMin(1000);
+    constraint_factory_.basic().width.setMax(5000);
+    constraint_factory_.basic().aspectRatio.setIdeal(3.0);
+    result = SelectSettings();
+    EXPECT_TRUE(result.HasValue());
+    // Ideal is closest to kMaxAspectRatio.
+    EXPECT_EQ(constraint_factory_.basic().height.min(), result.Height());
+    EXPECT_EQ(
+        std::round(constraint_factory_.basic().height.min() * kMaxAspectRatio),
+        result.Width());
+    CheckNonResolutionDefaults(result);
+
+    constraint_factory_.basic().aspectRatio.setIdeal(0.3);
+    result = SelectSettings();
+    EXPECT_TRUE(result.HasValue());
+    // Ideal is closest to kMinAspectRatio.
+    EXPECT_EQ(
+        std::round(constraint_factory_.basic().width.min() / kMinAspectRatio),
+        result.Height());
+    EXPECT_EQ(constraint_factory_.basic().width.min(), result.Width());
+    CheckNonResolutionDefaults(result);
+  }
+
+  // Ideal outside the constrained area, closest to a single point.
+  {
+    constraint_factory_.Reset();
+    constraint_factory_.basic().height.setMin(100);
+    constraint_factory_.basic().height.setMax(500);
+    constraint_factory_.basic().width.setMin(100);
+    constraint_factory_.basic().width.setMax(500);
+    constraint_factory_.basic().aspectRatio.setMin(1.0);
+    constraint_factory_.basic().aspectRatio.setIdeal(10.0);
+    auto result = SelectSettings();
+    EXPECT_TRUE(result.HasValue());
+    // Ideal is closest to the min height and max width.
+    EXPECT_EQ(constraint_factory_.basic().height.min(), result.Height());
+    EXPECT_EQ(constraint_factory_.basic().width.max(), result.Width());
+    CheckNonResolutionDefaults(result);
+  }
+}
+
+TEST_F(MediaStreamConstraintsUtilVideoContentTest, MandatoryExactFrameRate) {
+  constraint_factory_.Reset();
+  const int kFrameRate = 45.0;
+  constraint_factory_.basic().frameRate.setExact(kFrameRate);
+  auto result = SelectSettings();
+  EXPECT_TRUE(result.HasValue());
+  EXPECT_EQ(kFrameRate, result.FrameRate());
+  CheckNonFrameRateDefaults(result);
+}
+
+TEST_F(MediaStreamConstraintsUtilVideoContentTest, MandatoryMinFrameRate) {
+  constraint_factory_.Reset();
+  const double kFrameRate = 45.0;
+  constraint_factory_.basic().frameRate.setMin(kFrameRate);
+  auto result = SelectSettings();
+  EXPECT_TRUE(result.HasValue());
+  // kFrameRate is greater that the default, so expect kFrameRate.
+  EXPECT_EQ(kFrameRate, result.FrameRate());
+  CheckNonFrameRateDefaults(result);
+
+  const double kSmallFrameRate = 5.0;
+  constraint_factory_.basic().frameRate.setMin(kSmallFrameRate);
+  result = SelectSettings();
+  EXPECT_TRUE(result.HasValue());
+  // kFrameRate is greater that the default, so expect kFrameRate.
+  EXPECT_EQ(MediaStreamVideoSource::kDefaultFrameRate, result.FrameRate());
+  CheckNonFrameRateDefaults(result);
+}
+
+TEST_F(MediaStreamConstraintsUtilVideoContentTest, MandatoryMaxFrameRate) {
+  constraint_factory_.Reset();
+  const double kFrameRate = 45.0;
+  constraint_factory_.basic().frameRate.setMax(kFrameRate);
+  auto result = SelectSettings();
+  EXPECT_TRUE(result.HasValue());
+  // kFrameRate is greater that the default, so expect the default.
+  EXPECT_EQ(MediaStreamVideoSource::kDefaultFrameRate, result.FrameRate());
+  CheckNonFrameRateDefaults(result);
+
+  const double kSmallFrameRate = 5.0;
+  constraint_factory_.basic().frameRate.setMax(kSmallFrameRate);
+  result = SelectSettings();
+  EXPECT_TRUE(result.HasValue());
+  // kFrameRate is less that the default, so expect kFrameRate.
+  EXPECT_EQ(kSmallFrameRate, result.FrameRate());
+  CheckNonFrameRateDefaults(result);
+}
+
+TEST_F(MediaStreamConstraintsUtilVideoContentTest, MandatoryRangeFrameRate) {
+  constraint_factory_.Reset();
+  {
+    const double kMinFrameRate = 15.0;
+    const double kMaxFrameRate = 45.0;
+    constraint_factory_.basic().frameRate.setMax(kMinFrameRate);
+    constraint_factory_.basic().frameRate.setMax(kMaxFrameRate);
+    auto result = SelectSettings();
+    EXPECT_TRUE(result.HasValue());
+    // The range includes the default, so expect the default.
+    EXPECT_EQ(MediaStreamVideoSource::kDefaultFrameRate, result.FrameRate());
+    CheckNonFrameRateDefaults(result);
+  }
+
+  {
+    const double kMinFrameRate = 45.0;
+    const double kMaxFrameRate = 55.0;
+    constraint_factory_.basic().frameRate.setMax(kMinFrameRate);
+    constraint_factory_.basic().frameRate.setMax(kMaxFrameRate);
+    auto result = SelectSettings();
+    EXPECT_TRUE(result.HasValue());
+    // The whole range is greater that the default, so expect the minimum.
+    EXPECT_EQ(MediaStreamVideoSource::kDefaultFrameRate, result.FrameRate());
+    CheckNonFrameRateDefaults(result);
+  }
+
+  {
+    const double kMinFrameRate = 10.0;
+    const double kMaxFrameRate = 15.0;
+    constraint_factory_.basic().frameRate.setMax(kMinFrameRate);
+    constraint_factory_.basic().frameRate.setMax(kMaxFrameRate);
+    auto result = SelectSettings();
+    EXPECT_TRUE(result.HasValue());
+    // The whole range is less that the default, so expect the maximum.
+    EXPECT_EQ(kMaxFrameRate, result.FrameRate());
+    CheckNonFrameRateDefaults(result);
+  }
+}
+
+TEST_F(MediaStreamConstraintsUtilVideoContentTest, IdealFrameRate) {
+  // Unconstrained.
+  {
+    constraint_factory_.Reset();
+    const int kIdealFrameRate = 45.0;
+    constraint_factory_.basic().frameRate.setIdeal(kIdealFrameRate);
+    auto result = SelectSettings();
+    EXPECT_TRUE(result.HasValue());
+    EXPECT_EQ(kIdealFrameRate, result.FrameRate());
+    CheckNonFrameRateDefaults(result);
+  }
+
+  // Ideal greater than maximum.
+  {
+    constraint_factory_.Reset();
+    const int kIdealFrameRate = 45.0;
+    const int kMaxFrameRate = 30.0;
+    constraint_factory_.basic().frameRate.setIdeal(kIdealFrameRate);
+    constraint_factory_.basic().frameRate.setMax(kMaxFrameRate);
+    auto result = SelectSettings();
+    EXPECT_TRUE(result.HasValue());
+    EXPECT_EQ(kMaxFrameRate, result.FrameRate());
+    CheckNonFrameRateDefaults(result);
+  }
+
+  // Ideal less than minimum.
+  {
+    constraint_factory_.Reset();
+    const int kIdealFrameRate = 45.0;
+    const int kMinFrameRate = 50.0;
+    constraint_factory_.basic().frameRate.setIdeal(kIdealFrameRate);
+    constraint_factory_.basic().frameRate.setMin(kMinFrameRate);
+    auto result = SelectSettings();
+    EXPECT_TRUE(result.HasValue());
+    EXPECT_EQ(kMinFrameRate, result.FrameRate());
+    CheckNonFrameRateDefaults(result);
+  }
+
+  // Ideal within range.
+  {
+    constraint_factory_.Reset();
+    const int kIdealFrameRate = 45.0;
+    const int kMinFrameRate = 35.0;
+    const int kMaxFrameRate = 50.0;
+    constraint_factory_.basic().frameRate.setIdeal(kIdealFrameRate);
+    constraint_factory_.basic().frameRate.setMin(kMinFrameRate);
+    constraint_factory_.basic().frameRate.setMax(kMaxFrameRate);
+    auto result = SelectSettings();
+    EXPECT_TRUE(result.HasValue());
+    EXPECT_EQ(kIdealFrameRate, result.FrameRate());
+    CheckNonFrameRateDefaults(result);
+  }
+}
+
+// The "Advanced" tests check selection criteria involving advanced constraint
+// sets.
+TEST_F(MediaStreamConstraintsUtilVideoContentTest,
+       AdvancedMinMaxResolutionFrameRate) {
+  constraint_factory_.Reset();
+  blink::WebMediaTrackConstraintSet& advanced1 =
+      constraint_factory_.AddAdvanced();
+  advanced1.width.setMin(2000000000);
+  advanced1.height.setMin(2000000000);
+  // The first advanced set cannot be satisfied and is therefore ignored in all
+  // calls to SelectSettings().
+  // In this case, default settings must be selected.
+  auto result = SelectSettings();
+  EXPECT_TRUE(result.HasValue());
+  EXPECT_EQ(MediaStreamVideoSource::kDefaultHeight, result.Height());
+  EXPECT_EQ(MediaStreamVideoSource::kDefaultWidth, result.Width());
+  CheckNonResolutionDefaults(result);
+
+  blink::WebMediaTrackConstraintSet& advanced2 =
+      constraint_factory_.AddAdvanced();
+  advanced2.height.setMax(400);
+  advanced2.width.setMax(500);
+  advanced2.aspectRatio.setExact(5.0 / 4.0);
+  result = SelectSettings();
+  EXPECT_TRUE(result.HasValue());
+  EXPECT_EQ(400, result.Height());
+  EXPECT_EQ(500, result.Width());
+  CheckNonResolutionDefaults(result);
+
+  blink::WebMediaTrackConstraintSet& advanced3 =
+      constraint_factory_.AddAdvanced();
+  advanced3.frameRate.setMax(10.0);
+  result = SelectSettings();
+  EXPECT_TRUE(result.HasValue());
+  // The third advanced set is supported in addition to the previous set.
+  EXPECT_EQ(400, result.Height());
+  EXPECT_EQ(500, result.Width());
+  EXPECT_EQ(10.0, result.FrameRate());
+  EXPECT_EQ(rtc::Optional<bool>(), result.noise_reduction());
+  EXPECT_EQ(std::string(), result.device_id());
+
+  blink::WebMediaTrackConstraintSet& advanced4 =
+      constraint_factory_.AddAdvanced();
+  advanced4.width.setExact(1000);
+  advanced4.height.setExact(1000);
+  result = SelectSettings();
+  // The fourth advanced set cannot be supported in combination with the
+  // previous two sets, so it must be ignored.
+  EXPECT_TRUE(result.HasValue());
+  EXPECT_EQ(400, result.Height());
+  EXPECT_EQ(500, result.Width());
+  EXPECT_EQ(10.0, result.FrameRate());
+  EXPECT_EQ(rtc::Optional<bool>(), result.noise_reduction());
+  EXPECT_EQ(std::string(), result.device_id());
+
+  constraint_factory_.basic().width.setIdeal(100);
+  constraint_factory_.basic().height.setIdeal(100);
+  result = SelectSettings();
+  EXPECT_TRUE(result.HasValue());
+  // The closest point to (100, 100) that satisfies all previous constraint
+  // sets is its projection on the aspect-ratio line 5.0/4.0.
+  // This is a point m*(4, 5) such that Dot((4,5), (100 - m(4,5))) == 0.
+  // This works out to be m = 900/41.
+  EXPECT_EQ(std::round(4.0 * 900.0 / 41.0), result.Height());
+  EXPECT_EQ(std::round(5.0 * 900.0 / 41.0), result.Width());
+  EXPECT_EQ(10.0, result.FrameRate());
+  EXPECT_EQ(rtc::Optional<bool>(), result.noise_reduction());
+  EXPECT_EQ(std::string(), result.device_id());
+
+  constraint_factory_.basic().width.setIdeal(2000);
+  constraint_factory_.basic().height.setIdeal(1500);
+  result = SelectSettings();
+  EXPECT_TRUE(result.HasValue());
+  // The projection of (2000,1500) on the aspect-ratio line 5.0/4.0 is beyond
+  // the maximum of (400, 500), so use the maximum allowed resolution.
+  EXPECT_TRUE(result.HasValue());
+  EXPECT_EQ(400, result.Height());
+  EXPECT_EQ(500, result.Width());
+  EXPECT_EQ(10.0, result.FrameRate());
+  EXPECT_EQ(rtc::Optional<bool>(), result.noise_reduction());
+  EXPECT_EQ(std::string(), result.device_id());
+}
+
+TEST_F(MediaStreamConstraintsUtilVideoContentTest, AdvancedExactResolution) {
+  {
+    constraint_factory_.Reset();
+    blink::WebMediaTrackConstraintSet& advanced1 =
+        constraint_factory_.AddAdvanced();
+    advanced1.width.setExact(40000000);
+    advanced1.height.setExact(40000000);
+    blink::WebMediaTrackConstraintSet& advanced2 =
+        constraint_factory_.AddAdvanced();
+    advanced2.width.setExact(300000000);
+    advanced2.height.setExact(300000000);
+    auto result = SelectSettings();
+    // None of the constraint sets can be satisfied. Default resolution should
+    // be selected.
+    EXPECT_TRUE(result.HasValue());
+    EXPECT_EQ(MediaStreamVideoSource::kDefaultHeight, result.Height());
+    EXPECT_EQ(MediaStreamVideoSource::kDefaultWidth, result.Width());
+    CheckNonResolutionDefaults(result);
+
+    blink::WebMediaTrackConstraintSet& advanced3 =
+        constraint_factory_.AddAdvanced();
+    advanced3.width.setExact(1920);
+    advanced3.height.setExact(1080);
+    result = SelectSettings();
+    EXPECT_TRUE(result.HasValue());
+    EXPECT_EQ(1920, result.Width());
+    EXPECT_EQ(1080, result.Height());
+    CheckNonResolutionDefaults(result);
+
+    blink::WebMediaTrackConstraintSet& advanced4 =
+        constraint_factory_.AddAdvanced();
+    advanced4.width.setExact(640);
+    advanced4.height.setExact(480);
+    result = SelectSettings();
+    // The fourth constraint set contradicts the third set. The fourth set
+    // should be ignored.
+    EXPECT_TRUE(result.HasValue());
+    EXPECT_EQ(1920, result.Width());
+    EXPECT_EQ(1080, result.Height());
+    CheckNonResolutionDefaults(result);
+
+    constraint_factory_.basic().width.setIdeal(800);
+    constraint_factory_.basic().height.setIdeal(600);
+    result = SelectSettings();
+    EXPECT_TRUE(result.HasValue());
+    // The exact constraints has priority over ideal.
+    EXPECT_EQ(1920, result.Width());
+    EXPECT_EQ(1080, result.Height());
+    CheckNonResolutionDefaults(result);
+  }
+}
+
+TEST_F(MediaStreamConstraintsUtilVideoContentTest,
+       AdvancedResolutionAndFrameRate) {
+  constraint_factory_.Reset();
+  blink::WebMediaTrackConstraintSet& advanced1 =
+      constraint_factory_.AddAdvanced();
+  advanced1.width.setExact(1920);
+  advanced1.height.setExact(1080);
+  blink::WebMediaTrackConstraintSet& advanced2 =
+      constraint_factory_.AddAdvanced();
+  advanced2.frameRate.setExact(60.0);
+  auto result = SelectSettings();
+  EXPECT_TRUE(result.HasValue());
+  EXPECT_EQ(1920, result.Width());
+  EXPECT_EQ(1080, result.Height());
+  EXPECT_EQ(60.0, result.FrameRate());
+}
+
+TEST_F(MediaStreamConstraintsUtilVideoContentTest, AdvancedNoiseReduction) {
+  constraint_factory_.Reset();
+  blink::WebMediaTrackConstraintSet& advanced1 =
+      constraint_factory_.AddAdvanced();
+  advanced1.width.setMin(640);
+  advanced1.height.setMin(480);
+  blink::WebMediaTrackConstraintSet& advanced2 =
+      constraint_factory_.AddAdvanced();
+  advanced2.width.setMin(1920);
+  advanced2.height.setMin(1080);
+  advanced2.googNoiseReduction.setExact(false);
+  auto result = SelectSettings();
+  EXPECT_TRUE(result.HasValue());
+  EXPECT_EQ(1920, result.Width());
+  // Preserves default aspect ratio.
+  EXPECT_EQ(static_cast<int>(std::round(
+                result.Width() / MediaStreamVideoSource::kDefaultAspectRatio)),
+            result.Height());
+  EXPECT_TRUE(result.noise_reduction() && !*result.noise_reduction());
+}
+
+// The "AdvancedContradictory" tests check that advanced constraint sets that
+// contradict previous constraint sets are ignored.
+TEST_F(MediaStreamConstraintsUtilVideoContentTest,
+       AdvancedContradictoryNoiseReduction) {
+  constraint_factory_.Reset();
+  blink::WebMediaTrackConstraintSet& advanced1 =
+      constraint_factory_.AddAdvanced();
+  advanced1.width.setExact(640);
+  advanced1.height.setExact(480);
+  advanced1.googNoiseReduction.setExact(true);
+  blink::WebMediaTrackConstraintSet& advanced2 =
+      constraint_factory_.AddAdvanced();
+  advanced2.width.setExact(1920);
+  advanced2.height.setExact(1080);
+  advanced2.googNoiseReduction.setExact(false);
+  auto result = SelectSettings();
+  EXPECT_TRUE(result.HasValue());
+  EXPECT_EQ(640, result.Width());
+  EXPECT_EQ(480, result.Height());
+  EXPECT_TRUE(result.noise_reduction() && *result.noise_reduction());
+}
+
+TEST_F(MediaStreamConstraintsUtilVideoContentTest,
+       AdvancedContradictoryExactResolution) {
+  constraint_factory_.Reset();
+  blink::WebMediaTrackConstraintSet& advanced1 =
+      constraint_factory_.AddAdvanced();
+  advanced1.width.setExact(640);
+  advanced1.height.setExact(480);
+  blink::WebMediaTrackConstraintSet& advanced2 =
+      constraint_factory_.AddAdvanced();
+  advanced2.width.setExact(1920);
+  advanced2.height.setExact(1080);
+  auto result = SelectSettings();
+  EXPECT_TRUE(result.HasValue());
+  EXPECT_EQ(640, result.Width());
+  EXPECT_EQ(480, result.Height());
+  // Resolution cannot be adjusted due to exact in the first advanced set.
+  CheckNonResolutionDefaults(result);
+}
+
+TEST_F(MediaStreamConstraintsUtilVideoContentTest,
+       AdvancedContradictoryMaxMinResolutionFrameRate) {
+  constraint_factory_.Reset();
+  blink::WebMediaTrackConstraintSet& advanced1 =
+      constraint_factory_.AddAdvanced();
+  advanced1.width.setMax(640);
+  advanced1.height.setMax(480);
+  blink::WebMediaTrackConstraintSet& advanced2 =
+      constraint_factory_.AddAdvanced();
+  advanced2.width.setMin(1920);
+  advanced2.height.setMin(1080);
+  advanced2.frameRate.setExact(60.0);
+  auto result = SelectSettings();
+  EXPECT_TRUE(result.HasValue());
+  EXPECT_EQ(640, result.Width());
+  EXPECT_EQ(480, result.Height());
+  // Resolution cannot exceed the requested resolution.
+  EXPECT_EQ(MediaStreamVideoSource::kDefaultFrameRate, result.FrameRate());
+}
+
+TEST_F(MediaStreamConstraintsUtilVideoContentTest,
+       AdvancedContradictoryMinMaxResolutionFrameRate) {
+  constraint_factory_.Reset();
+  blink::WebMediaTrackConstraintSet& advanced1 =
+      constraint_factory_.AddAdvanced();
+  advanced1.width.setMin(800);
+  advanced1.height.setMin(600);
+  blink::WebMediaTrackConstraintSet& advanced2 =
+      constraint_factory_.AddAdvanced();
+  advanced2.width.setMax(640);
+  advanced2.height.setMax(480);
+  advanced2.frameRate.setExact(60.0);
+  auto result = SelectSettings();
+  EXPECT_TRUE(result.HasValue());
+  EXPECT_EQ(800, result.Width());
+  EXPECT_EQ(600, result.Height());
+  EXPECT_EQ(MediaStreamVideoSource::kDefaultFrameRate, result.FrameRate());
+}
+
+TEST_F(MediaStreamConstraintsUtilVideoContentTest,
+       AdvancedContradictoryExactAspectRatio) {
+  constraint_factory_.Reset();
+  blink::WebMediaTrackConstraintSet& advanced1 =
+      constraint_factory_.AddAdvanced();
+  advanced1.aspectRatio.setExact(10.0);
+  blink::WebMediaTrackConstraintSet& advanced2 =
+      constraint_factory_.AddAdvanced();
+  advanced2.aspectRatio.setExact(3.0);
+  auto result = SelectSettings();
+  EXPECT_TRUE(result.HasValue());
+  EXPECT_EQ(std::round(MediaStreamVideoSource::kDefaultHeight * 10.0),
+            result.Width());
+  EXPECT_EQ(MediaStreamVideoSource::kDefaultHeight, result.Height());
+  CheckNonResolutionDefaults(result);
+}
+
+TEST_F(MediaStreamConstraintsUtilVideoContentTest,
+       AdvancedContradictoryAspectRatioRange) {
+  constraint_factory_.Reset();
+  blink::WebMediaTrackConstraintSet& advanced1 =
+      constraint_factory_.AddAdvanced();
+  advanced1.aspectRatio.setMin(10.0);
+  blink::WebMediaTrackConstraintSet& advanced2 =
+      constraint_factory_.AddAdvanced();
+  advanced2.aspectRatio.setMax(3.0);
+  auto result = SelectSettings();
+  EXPECT_TRUE(result.HasValue());
+  EXPECT_EQ(std::round(MediaStreamVideoSource::kDefaultHeight * 10.0),
+            result.Width());
+  EXPECT_EQ(MediaStreamVideoSource::kDefaultHeight, result.Height());
+  CheckNonResolutionDefaults(result);
+}
+
+TEST_F(MediaStreamConstraintsUtilVideoContentTest,
+       AdvancedContradictoryExactFrameRate) {
+  constraint_factory_.Reset();
+  blink::WebMediaTrackConstraintSet& advanced1 =
+      constraint_factory_.AddAdvanced();
+  advanced1.frameRate.setExact(40.0);
+  blink::WebMediaTrackConstraintSet& advanced2 =
+      constraint_factory_.AddAdvanced();
+  advanced2.frameRate.setExact(45.0);
+  auto result = SelectSettings();
+  EXPECT_TRUE(result.HasValue());
+  EXPECT_EQ(40.0, result.FrameRate());
+  CheckNonFrameRateDefaults(result);
+}
+
+TEST_F(MediaStreamConstraintsUtilVideoContentTest,
+       AdvancedContradictoryFrameRateRange) {
+  constraint_factory_.Reset();
+  blink::WebMediaTrackConstraintSet& advanced1 =
+      constraint_factory_.AddAdvanced();
+  advanced1.frameRate.setMin(40.0);
+  blink::WebMediaTrackConstraintSet& advanced2 =
+      constraint_factory_.AddAdvanced();
+  advanced2.frameRate.setMax(35.0);
+  auto result = SelectSettings();
+  EXPECT_TRUE(result.HasValue());
+  EXPECT_LE(40.0, result.FrameRate());
+  CheckNonFrameRateDefaults(result);
+}
+
+TEST_F(MediaStreamConstraintsUtilVideoContentTest,
+       AdvancedContradictoryWidthFrameRate) {
+  constraint_factory_.Reset();
+  blink::WebMediaTrackConstraintSet& advanced1 =
+      constraint_factory_.AddAdvanced();
+  advanced1.width.setMax(1920);
+  blink::WebMediaTrackConstraintSet& advanced2 =
+      constraint_factory_.AddAdvanced();
+  advanced2.width.setMin(2000);
+  advanced2.frameRate.setExact(10.0);
+  blink::WebMediaTrackConstraintSet& advanced3 =
+      constraint_factory_.AddAdvanced();
+  advanced3.frameRate.setExact(90.0);
+  auto result = SelectSettings();
+  EXPECT_TRUE(result.HasValue());
+  EXPECT_EQ(MediaStreamVideoSource::kDefaultWidth, result.Width());
+  EXPECT_EQ(MediaStreamVideoSource::kDefaultHeight, result.Height());
+  EXPECT_EQ(90.0, result.FrameRate());
+}
+
+TEST_F(MediaStreamConstraintsUtilVideoContentTest,
+       AdvancedContradictoryHeightFrameRate) {
+  constraint_factory_.Reset();
+  blink::WebMediaTrackConstraintSet& advanced1 =
+      constraint_factory_.AddAdvanced();
+  advanced1.height.setMax(1080);
+  blink::WebMediaTrackConstraintSet& advanced2 =
+      constraint_factory_.AddAdvanced();
+  advanced2.height.setMin(1500);
+  advanced2.frameRate.setExact(10.0);
+  blink::WebMediaTrackConstraintSet& advanced3 =
+      constraint_factory_.AddAdvanced();
+  advanced3.frameRate.setExact(60.0);
+  auto result = SelectSettings();
+  EXPECT_TRUE(result.HasValue());
+  EXPECT_EQ(MediaStreamVideoSource::kDefaultWidth, result.Width());
+  EXPECT_EQ(MediaStreamVideoSource::kDefaultHeight, result.Height());
+  EXPECT_EQ(60.0, result.FrameRate());
+}
+
+TEST_F(MediaStreamConstraintsUtilVideoContentTest, AdvancedDeviceID) {
+  const std::string kDeviceID1 = "fake_device_1";
+  const std::string kDeviceID2 = "fake_device_2";
+  const std::string kDeviceID3 = "fake_device_3";
+  const std::string kDeviceID4 = "fake_device_4";
+  constraint_factory_.Reset();
+  blink::WebMediaTrackConstraintSet& advanced1 =
+      constraint_factory_.AddAdvanced();
+  blink::WebString id_vector1[] = {blink::WebString::fromASCII(kDeviceID1),
+                                   blink::WebString::fromASCII(kDeviceID2)};
+  advanced1.deviceId.setExact(
+      blink::WebVector<blink::WebString>(id_vector1, arraysize(id_vector1)));
+  blink::WebString id_vector2[] = {blink::WebString::fromASCII(kDeviceID2),
+                                   blink::WebString::fromASCII(kDeviceID3)};
+  blink::WebMediaTrackConstraintSet& advanced2 =
+      constraint_factory_.AddAdvanced();
+  advanced2.deviceId.setExact(
+      blink::WebVector<blink::WebString>(id_vector2, arraysize(id_vector2)));
+  auto result = SelectSettings();
+  EXPECT_TRUE(result.HasValue());
+  // kDeviceID2 must be selected because it is the only one that satisfies both
+  // advanced sets.
+  EXPECT_EQ(kDeviceID2, result.device_id());
+}
+
+TEST_F(MediaStreamConstraintsUtilVideoContentTest,
+       AdvancedContradictoryDeviceID) {
+  const std::string kDeviceID1 = "fake_device_1";
+  const std::string kDeviceID2 = "fake_device_2";
+  const std::string kDeviceID3 = "fake_device_3";
+  const std::string kDeviceID4 = "fake_device_4";
+  constraint_factory_.Reset();
+  blink::WebMediaTrackConstraintSet& advanced1 =
+      constraint_factory_.AddAdvanced();
+  blink::WebString id_vector1[] = {blink::WebString::fromASCII(kDeviceID1),
+                                   blink::WebString::fromASCII(kDeviceID2)};
+  advanced1.deviceId.setExact(
+      blink::WebVector<blink::WebString>(id_vector1, arraysize(id_vector1)));
+  blink::WebString id_vector2[] = {blink::WebString::fromASCII(kDeviceID3),
+                                   blink::WebString::fromASCII(kDeviceID4)};
+  blink::WebMediaTrackConstraintSet& advanced2 =
+      constraint_factory_.AddAdvanced();
+  advanced2.deviceId.setExact(
+      blink::WebVector<blink::WebString>(id_vector2, arraysize(id_vector2)));
+  auto result = SelectSettings();
+  EXPECT_TRUE(result.HasValue());
+  // The second advanced set must be ignored because it contradicts the first
+  // set.
+  EXPECT_EQ(std::string(kDeviceID1), result.device_id());
+}
+
+TEST_F(MediaStreamConstraintsUtilVideoContentTest, AdvancedIdealDeviceID) {
+  const std::string kDeviceID1 = "fake_device_1";
+  const std::string kDeviceID2 = "fake_device_2";
+  const std::string kDeviceID3 = "fake_device_3";
+  constraint_factory_.Reset();
+  blink::WebMediaTrackConstraintSet& advanced =
+      constraint_factory_.AddAdvanced();
+  blink::WebString id_vector1[] = {blink::WebString::fromASCII(kDeviceID1),
+                                   blink::WebString::fromASCII(kDeviceID2)};
+  advanced.deviceId.setExact(
+      blink::WebVector<blink::WebString>(id_vector1, arraysize(id_vector1)));
+
+  blink::WebString id_vector2[] = {blink::WebString::fromASCII(kDeviceID2),
+                                   blink::WebString::fromASCII(kDeviceID3)};
+  constraint_factory_.basic().deviceId.setIdeal(
+      blink::WebVector<blink::WebString>(id_vector2, arraysize(id_vector2)));
+  auto result = SelectSettings();
+  EXPECT_TRUE(result.HasValue());
+  // Should select kDeviceID2, which appears in ideal and satisfies the advanced
+  // set.
+  EXPECT_EQ(std::string(kDeviceID2), result.device_id());
+}
+
+TEST_F(MediaStreamConstraintsUtilVideoContentTest, ResolutionChangePolicy) {
+  {
+    constraint_factory_.Reset();
+    auto result = SelectSettings();
+    EXPECT_EQ(MediaStreamVideoSource::kDefaultWidth, result.Width());
+    EXPECT_EQ(MediaStreamVideoSource::kDefaultHeight, result.Height());
+    // Resolution can be adjusted.
+    EXPECT_EQ(media::RESOLUTION_POLICY_ANY_WITHIN_LIMIT,
+              result.ResolutionChangePolicy());
+  }
+  {
+    constraint_factory_.Reset();
+    constraint_factory_.basic().width.setIdeal(630);
+    constraint_factory_.basic().height.setIdeal(470);
+    auto result = SelectSettings();
+    EXPECT_EQ(630, result.Width());
+    EXPECT_EQ(470, result.Height());
+    // Resolution can be adjusted because ideal was used to select the
+    // resolution.
+    EXPECT_EQ(media::RESOLUTION_POLICY_ANY_WITHIN_LIMIT,
+              result.ResolutionChangePolicy());
+  }
+  {
+    constraint_factory_.Reset();
+    constraint_factory_.basic().width.setExact(640);
+    constraint_factory_.basic().height.setExact(480);
+    auto result = SelectSettings();
+    EXPECT_EQ(640, result.Width());
+    EXPECT_EQ(480, result.Height());
+    EXPECT_EQ(media::RESOLUTION_POLICY_FIXED_RESOLUTION,
+              result.ResolutionChangePolicy());
+  }
+  {
+    constraint_factory_.Reset();
+    constraint_factory_.basic().width.setExact(1000);
+    constraint_factory_.basic().height.setExact(500);
+    auto result = SelectSettings();
+    EXPECT_EQ(1000, result.Width());
+    EXPECT_EQ(500, result.Height());
+    EXPECT_EQ(media::RESOLUTION_POLICY_FIXED_RESOLUTION,
+              result.ResolutionChangePolicy());
+  }
+  {
+    constraint_factory_.Reset();
+    constraint_factory_.basic().width.setExact(630);
+    constraint_factory_.basic().height.setExact(470);
+    auto result = SelectSettings();
+    EXPECT_EQ(630, result.Width());
+    EXPECT_EQ(470, result.Height());
+    EXPECT_EQ(media::RESOLUTION_POLICY_FIXED_RESOLUTION,
+              result.ResolutionChangePolicy());
+  }
+  {
+    constraint_factory_.Reset();
+    constraint_factory_.basic().width.setIdeal(630);
+    constraint_factory_.basic().width.setMin(629);
+    constraint_factory_.basic().width.setMax(631);
+    constraint_factory_.basic().height.setIdeal(470);
+    constraint_factory_.basic().height.setMin(469);
+    auto result = SelectSettings();
+    EXPECT_EQ(630, result.Width());
+    EXPECT_EQ(470, result.Height());
+    // Min/Max ranges prevent the resolution from being adjusted.
+    EXPECT_EQ(media::RESOLUTION_POLICY_FIXED_RESOLUTION,
+              result.ResolutionChangePolicy());
+  }
+  {
+    constraint_factory_.Reset();
+    constraint_factory_.basic().aspectRatio.setExact(1.32);
+    constraint_factory_.basic().height.setIdeal(480);
+    auto result = SelectSettings();
+    EXPECT_EQ(std::round(480 * 1.32), result.Width());
+    EXPECT_EQ(480, result.Height());
+    // Exact aspect ratio prevents the resolution from being adjusted.
+    EXPECT_EQ(media::RESOLUTION_POLICY_FIXED_RESOLUTION,
+              result.ResolutionChangePolicy());
+  }
+}
+
+}  // namespace content