[FeaturePolicy] Initial implementation of Feature Policy

third_party/WebKit/Source/platform/feature_policy/FeaturePolicyTest.cpp

Index: third_party/WebKit/Source/platform/feature_policy/FeaturePolicyTest.cpp
diff --git a/third_party/WebKit/Source/platform/feature_policy/FeaturePolicyTest.cpp b/third_party/WebKit/Source/platform/feature_policy/FeaturePolicyTest.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..a537f98b27acb016bb6626aa0bb3cfb4f6a7e3ca
--- /dev/null
+++ b/third_party/WebKit/Source/platform/feature_policy/FeaturePolicyTest.cpp
@@ -0,0 +1,519 @@
+// Copyright 2016 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 "platform/feature_policy/FeaturePolicy.h"
+
+#include "platform/RuntimeEnabledFeatures.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+// Origin strings used for tests
+#define ORIGIN_A "https://example.com/"
+#define ORIGIN_B "https://example.net/"
+#define ORIGIN_C "https://example.org/"

[raymes, 2016/10/19 23:47:37]

nit: can these just be const char*? I haven't seen this style much but it may be
a blink thing?

[iclelland, 2016/10/21 13:38:25]

I'm using the macros so that we can do easy string substitution to build the
test policies. In tests, I create a policy string like:

"{\"vibrate\": [\"" ORIGIN_A "\"]}"

and the preprocessor's string concatenation takes care of building the correct
string. We couldn't do that with char*. 

+
+namespace blink {
+
+namespace {
+
+const char* kInvalidPolicies[] = {"Not A JSON literal", "\"Not a JSON object\"",
+                                  "[\"Also\", \"Not a JSON object\"]", "1.0"};
+
+// This is an example of a feature which should be disabled by default, both in
+// top-level and nested frames.
+const FeaturePolicyFeature kOffByDeaultFeature{"offbydefault",
+                                               kDisableFeatureForAllOrigins};
+
+}  // namespace
+
+class FeaturePolicyTest : public ::testing::Test {
+ protected:
+  FeaturePolicyTest()
+      : m_frameworkWasEnabled(RuntimeEnabledFeatures::featurePolicyEnabled()) {
+    RuntimeEnabledFeatures::setFeaturePolicyEnabled(true);
+    // Set the list of controlled features, so that we are guaranteed to
+    // have at least one of each kind of default behaviour represented.
+    Vector<const FeaturePolicyFeature*> featureRegistry =
+        FeaturePolicy::getFeatureRegistry();

[dcheng, 2016/10/20 17:41:44]

Doesn't this copy the feature registry? So I don't think any of the changes here
are actually affecting the policies.

Since the unit test is just testing createFromParentPolicy, maybe it'd be easier
to just have a const default registry, and let createFromParentPolicy take in a
pointer to the registry to use. Then tests can pass in whatever custom registry
they like, and we can avoid shooting ourselves in the foot from code that
accidentally mutates the feature policy outside of tests.

[iclelland, 2016/10/21 13:38:25]

I had fixed this this afternoon, but you're right that a pointer to a default
registry would work.

I've changed it to use const references everywhere, with a default built in to
the FeaturePolicy class (so that call sites don't have to know the correct list
of features, but the tests can still override). PTAL to see if that is
satisfactory, thanks!

+    featureRegistry.clear();
+    featureRegistry.append(&kDocumentWrite);
+    featureRegistry.append(&kVibrateFeature);
+    featureRegistry.append(&kOffByDeaultFeature);

[raymes, 2016/10/19 23:47:37]

nit (optional): should we just make all of these invented features, defined in
this file?

[iclelland, 2016/10/21 13:38:26]

Done. I thought that using the real features would make the test cases more
intuitively understandable, but this is more resilient against features being
removed from the policy spec.

+  }
+
+  ~FeaturePolicyTest() {
+    RuntimeEnabledFeatures::setFeaturePolicyEnabled(m_frameworkWasEnabled);
+  }
+
+  RefPtr<SecurityOrigin> originA = SecurityOrigin::createFromString(ORIGIN_A);

[raymes, 2016/10/19 23:47:37]

nit: should these be prefixed with m_ (I don't know blink style well, so I may
be wrong :)?

[iclelland, 2016/10/21 13:38:26]

Done.

+  RefPtr<SecurityOrigin> originB = SecurityOrigin::createFromString(ORIGIN_B);
+  RefPtr<SecurityOrigin> originC = SecurityOrigin::createFromString(ORIGIN_C);
+
+ private:
+  const bool m_frameworkWasEnabled;
+};
+
+TEST_F(FeaturePolicyTest, ParseInvalidPolicy) {
+  for (const char* invalidPolicy : kInvalidPolicies) {
+    EXPECT_TRUE(invalidPolicy);

[raymes, 2016/10/19 23:47:37]

Hmm, what is this testing?

[iclelland, 2016/10/21 13:38:26]

Ahh, I had implemented that test yesterday, but didn't upload it. Done now.

+  }
+}
+
+TEST_F(FeaturePolicyTest, TestInitialPolicy) {
+  // +-------------+
+  // |(1)Origin A  |
+  // |No Policy    |
+  // +-------------+
+  // Default-on and top-level-only features should be enabled in top-level
+  // frame. Default-off features should be disabled.
+  FeaturePolicy* policy1 =
+      FeaturePolicy::createFromParentPolicy(nullptr, originA);
+  EXPECT_TRUE(policy1->isFeatureEnabled(&kDocumentWrite));
+  EXPECT_TRUE(policy1->isFeatureEnabled(&kVibrateFeature));
+  EXPECT_FALSE(policy1->isFeatureEnabled(&kOffByDeaultFeature));
+}
+
+TEST_F(FeaturePolicyTest, TestInitialSameOriginChildPolicy) {
+  // +-----------------+
+  // |(1)Origin A      |
+  // |No Policy        |
+  // | +-------------+ |
+  // | |(2)Origin A  | |
+  // | |No Policy    | |
+  // | +-------------+ |
+  // +-----------------+
+  // Default-on features should be enabled in child frame. Default-off and
+  // top-level-only features should be disabled.

[raymes, 2016/10/19 23:47:37]

nit: I think this comment is slightly out of date? The top-level only feature is
enabled because the nested frame is the same origin

[iclelland, 2016/10/21 13:38:25]

Thanks, fixed.

+  FeaturePolicy* policy1 =
+      FeaturePolicy::createFromParentPolicy(nullptr, originA);
+  FeaturePolicy* policy2 =
+      FeaturePolicy::createFromParentPolicy(policy1, originA);
+  EXPECT_TRUE(policy2->isFeatureEnabled(&kDocumentWrite));
+  EXPECT_TRUE(policy2->isFeatureEnabled(&kVibrateFeature));
+  EXPECT_FALSE(policy2->isFeatureEnabled(&kOffByDeaultFeature));
+}
+
+TEST_F(FeaturePolicyTest, TestInitialCrossOriginChildPolicy) {
+  // +-----------------+
+  // |(1)Origin A      |
+  // |No Policy        |
+  // | +-------------+ |
+  // | |(2)Origin B  | |
+  // | |No Policy    | |
+  // | +-------------+ |
+  // +-----------------+
+  // Default-on features should be enabled in child frame. Default-off and
+  // top-level-only features should be disabled.
+  FeaturePolicy* policy1 =
+      FeaturePolicy::createFromParentPolicy(nullptr, originA);
+  FeaturePolicy* policy2 =
+      FeaturePolicy::createFromParentPolicy(policy1, originB);
+  EXPECT_TRUE(policy2->isFeatureEnabled(&kDocumentWrite));
+  EXPECT_FALSE(policy2->isFeatureEnabled(&kVibrateFeature));
+  EXPECT_FALSE(policy2->isFeatureEnabled(&kOffByDeaultFeature));
+}
+
+TEST_F(FeaturePolicyTest, TestCrossOriginChildCannotEnableFeature) {
+  // +-------------------------------------+
+  // |(1) Origin A                         |
+  // |No Policy                            |
+  // | +---------------------------------+ |
+  // | |(2) Origin B                     | |
+  // | |Policy: {"vibrate": ["self"]}    | |
+  // | +---------------------------------+ |
+  // +-------------------------------------+
+  // Feature should be disabled in cross origin frame, even if no policy was
+  // specified in the parent frame.
+  FeaturePolicy* policy1 =
+      FeaturePolicy::createFromParentPolicy(nullptr, originA);
+  FeaturePolicy* policy2 =
+      FeaturePolicy::createFromParentPolicy(policy1, originB);
+  policy2->setHeaderPolicy("{\"vibrate\": [\"self\"]}");
+  EXPECT_FALSE(policy2->isFeatureEnabled(&kVibrateFeature));
+}
+
+TEST_F(FeaturePolicyTest, TestFrameSelfInheritance) {
+  // +------------------------------------------+
+  // |(1) Origin A                              |
+  // |Policy: {"vibrate": ["self"]}             |
+  // | +-----------------+  +-----------------+ |
+  // | |(2) Origin A     |  |(4) Origin B     | |
+  // | |No Policy        |  |No Policy        | |
+  // | | +-------------+ |  | +-------------+ | |
+  // | | |(3)Origin A  | |  | |(5)Origin B  | | |
+  // | | |No Policy    | |  | |No Policy    | | |
+  // | | +-------------+ |  | +-------------+ | |
+  // | +-----------------+  +-----------------+ |
+  // +------------------------------------------+
+  // Feature should be enabled at the top-level, and through the chain of
+  // same-origin frames 2 and 3. It should be disabled in frames 4 and 5, as
+  // they are at a different origin.
+  FeaturePolicy* policy1 =
+      FeaturePolicy::createFromParentPolicy(nullptr, originA);
+  policy1->setHeaderPolicy("{\"vibrate\": [\"self\"]}");
+  FeaturePolicy* policy2 =
+      FeaturePolicy::createFromParentPolicy(policy1, originA);
+  FeaturePolicy* policy3 =
+      FeaturePolicy::createFromParentPolicy(policy2, originA);
+  FeaturePolicy* policy4 =
+      FeaturePolicy::createFromParentPolicy(policy1, originB);
+  FeaturePolicy* policy5 =
+      FeaturePolicy::createFromParentPolicy(policy4, originB);
+  EXPECT_TRUE(policy2->isFeatureEnabled(&kVibrateFeature));
+  EXPECT_TRUE(policy3->isFeatureEnabled(&kVibrateFeature));
+  EXPECT_FALSE(policy4->isFeatureEnabled(&kVibrateFeature));
+  EXPECT_FALSE(policy5->isFeatureEnabled(&kVibrateFeature));
+}
+
+TEST_F(FeaturePolicyTest, TestReflexiveFrameSelfInheritance) {
+  // +---------------------------------+
+  // |(1) Origin A                     |
+  // |Policy: {"vibrate": ["self"]}    |
+  // | +-----------------+             |
+  // | |(2) Origin B     |             |
+  // | |No Policy        |             |
+  // | | +-------------+ |             |
+  // | | |(3)Origin A  | |             |
+  // | | |No Policy    | |             |
+  // | | +-------------+ |             |
+  // | +-----------------+             |
+  // +---------------------------------+
+  // Feature which is enabled at top-level should be disabled in frame 3, as
+  // it is embedded by frame 2, for which the feature is not enabled.
+  FeaturePolicy* policy1 =
+      FeaturePolicy::createFromParentPolicy(nullptr, originA);
+  policy1->setHeaderPolicy("{\"vibrate\": [\"self\"]}");
+  FeaturePolicy* policy2 =
+      FeaturePolicy::createFromParentPolicy(policy1, originB);
+  FeaturePolicy* policy3 =
+      FeaturePolicy::createFromParentPolicy(policy2, originA);
+  EXPECT_FALSE(policy2->isFeatureEnabled(&kVibrateFeature));
+  EXPECT_FALSE(policy3->isFeatureEnabled(&kVibrateFeature));
+}
+
+TEST_F(FeaturePolicyTest, TestSelectiveFrameInheritance) {
+  // +------------------------------------------+
+  // |(1) Origin A                              |
+  // |Policy: {"vibrate": ["Origin B"]}         |
+  // | +-----------------+  +-----------------+ |
+  // | |(2) Origin B     |  |(3) Origin C     | |
+  // | |No Policy        |  |No Policy        | |
+  // | |                 |  | +-------------+ | |
+  // | |                 |  | |(4)Origin B  | | |
+  // | |                 |  | |No Policy    | | |
+  // | |                 |  | +-------------+ | |
+  // | +-----------------+  +-----------------+ |
+  // +------------------------------------------+
+  // Feature should be enabled in second level Origin B frame, but disabled in
+  // Frame 4, because it is embedded by frame 3, where the feature is not
+  // enabled.
+  FeaturePolicy* policy1 =
+      FeaturePolicy::createFromParentPolicy(nullptr, originA);
+  policy1->setHeaderPolicy("{\"vibrate\": [\"" ORIGIN_B "\"]}");
+  FeaturePolicy* policy2 =
+      FeaturePolicy::createFromParentPolicy(policy1, originB);
+  FeaturePolicy* policy3 =
+      FeaturePolicy::createFromParentPolicy(policy1, originC);
+  FeaturePolicy* policy4 =
+      FeaturePolicy::createFromParentPolicy(policy3, originB);
+  EXPECT_TRUE(policy2->isFeatureEnabled(&kVibrateFeature));
+  EXPECT_FALSE(policy3->isFeatureEnabled(&kVibrateFeature));
+  EXPECT_FALSE(policy4->isFeatureEnabled(&kVibrateFeature));
+}
+
+TEST_F(FeaturePolicyTest, TestPolicyCanBlockSelf) {
+  // +----------------------------+
+  // |(1)Origin A                 |
+  // |Policy: {"docwrite": []}    |
+  // +----------------------------+
+  // Default-on feature should be disabled in top-level frame.
+  FeaturePolicy* policy1 =
+      FeaturePolicy::createFromParentPolicy(nullptr, originA);
+  policy1->setHeaderPolicy("{\"docwrite\": []}");
+  EXPECT_FALSE(policy1->isFeatureEnabled(&kDocumentWrite));
+}
+
+TEST_F(FeaturePolicyTest, TestParentPolicyBlocksSameOriginChildPolicy) {
+  // +----------------------------+
+  // |(1)Origin A                 |
+  // |Policy: {"docwrite": []}    |
+  // | +-------------+            |
+  // | |(2)Origin A  |            |
+  // | |No Policy    |            |
+  // | +-------------+            |
+  // +----------------------------+
+  // Feature should be disabled in child frame.
+  FeaturePolicy* policy1 =
+      FeaturePolicy::createFromParentPolicy(nullptr, originA);
+  policy1->setHeaderPolicy("{\"docwrite\": []}");
+  FeaturePolicy* policy2 =
+      FeaturePolicy::createFromParentPolicy(policy1, originA);
+  EXPECT_FALSE(policy2->isFeatureEnabled(&kDocumentWrite));
+}
+
+TEST_F(FeaturePolicyTest, TestChildPolicyCanBlockSelf) {
+  // +--------------------------------+
+  // |(1)Origin A                     |
+  // |No Policy                       |
+  // | +----------------------------+ |
+  // | |(2)Origin B                 | |
+  // | |Policy: {"docwrite": []}    | |
+  // | +----------------------------+ |
+  // +--------------------------------+
+  // Default-on feature should be disabled by cross-origin child frame.
+  FeaturePolicy* policy1 =
+      FeaturePolicy::createFromParentPolicy(nullptr, originA);
+  FeaturePolicy* policy2 =
+      FeaturePolicy::createFromParentPolicy(policy1, originB);
+  policy2->setHeaderPolicy("{\"docwrite\": []}");
+  EXPECT_FALSE(policy2->isFeatureEnabled(&kDocumentWrite));
+}
+
+TEST_F(FeaturePolicyTest, TestChildPolicyCanBlockChildren) {
+  // +--------------------------------------+
+  // |(1)Origin A                           |
+  // |No Policy                             |
+  // | +----------------------------------+ |
+  // | |(2)Origin B                       | |
+  // | |Policy: {"docwrite": ["self"]}    | |
+  // | | +-------------+                  | |
+  // | | |(3)Origin C  |                  | |
+  // | | |No Policy    |                  | |
+  // | | +-------------+                  | |
+  // | +----------------------------------+ |
+  // +--------------------------------------+
+  // Default-on feature should be enabled in frames 1 and 2; disabled in frame
+  // 3 by child frame policy.
+  FeaturePolicy* policy1 =
+      FeaturePolicy::createFromParentPolicy(nullptr, originA);
+  FeaturePolicy* policy2 =
+      FeaturePolicy::createFromParentPolicy(policy1, originB);
+  policy2->setHeaderPolicy("{\"docwrite\": [\"self\"]}");
+  FeaturePolicy* policy3 =
+      FeaturePolicy::createFromParentPolicy(policy2, originC);
+  EXPECT_TRUE(policy2->isFeatureEnabled(&kDocumentWrite));
+  EXPECT_FALSE(policy3->isFeatureEnabled(&kDocumentWrite));
+}
+
+TEST_F(FeaturePolicyTest, TestParentPolicyBlocksCrossOriginChildPolicy) {
+  // +----------------------------+
+  // |(1)Origin A                 |
+  // |Policy: {"docwrite": []}    |
+  // | +-------------+            |
+  // | |(2)Origin B  |            |
+  // | |No Policy    |            |
+  // | +-------------+            |
+  // +----------------------------+
+  // Default-on feature should be disabled in cross-origin child frame.
+  FeaturePolicy* policy1 =
+      FeaturePolicy::createFromParentPolicy(nullptr, originA);
+  policy1->setHeaderPolicy("{\"docwrite\": []}");
+  FeaturePolicy* policy2 =
+      FeaturePolicy::createFromParentPolicy(policy1, originB);
+  EXPECT_FALSE(policy2->isFeatureEnabled(&kDocumentWrite));
+}
+
+TEST_F(FeaturePolicyTest, TestEnableForAllOrigins) {
+  // +------------------------------+
+  // |(1) Origin A                  |
+  // |Policy: {"vibrate": ["*"]}    |
+  // | +-----------------+          |
+  // | |(2) Origin B     |          |
+  // | |No Policy        |          |
+  // | | +-------------+ |          |
+  // | | |(3)Origin A  | |          |
+  // | | |No Policy    | |          |
+  // | | +-------------+ |          |
+  // | +-----------------+          |
+  // +------------------------------+
+  // Feature should be enabled in top and second level; disabled in frame 3.
+  FeaturePolicy* policy1 =
+      FeaturePolicy::createFromParentPolicy(nullptr, originA);
+  policy1->setHeaderPolicy("{\"vibrate\": [\"*\"]}");
+  FeaturePolicy* policy2 =
+      FeaturePolicy::createFromParentPolicy(policy1, originB);
+  FeaturePolicy* policy3 =
+      FeaturePolicy::createFromParentPolicy(policy2, originA);
+  EXPECT_TRUE(policy1->isFeatureEnabled(&kVibrateFeature));
+  EXPECT_TRUE(policy2->isFeatureEnabled(&kVibrateFeature));
+  EXPECT_FALSE(policy3->isFeatureEnabled(&kVibrateFeature));
+}
+
+TEST_F(FeaturePolicyTest, TestReenableForAllOrigins) {
+  // +----------------------------------+
+  // |(1) Origin A                      |
+  // |Policy: {"vibrate": ["*"]}        |
+  // | +------------------------------+ |
+  // | |(2) Origin B                  | |
+  // | |Policy: {"vibrate": ["*"]}    | |
+  // | | +-------------+              | |
+  // | | |(3)Origin A  |              | |
+  // | | |No Policy    |              | |
+  // | | +-------------+              | |
+  // | +------------------------------+ |
+  // +----------------------------------+
+  // Feature should be enabled in all frames.
+  FeaturePolicy* policy1 =
+      FeaturePolicy::createFromParentPolicy(nullptr, originA);
+  policy1->setHeaderPolicy("{\"vibrate\": [\"*\"]}");
+  FeaturePolicy* policy2 =
+      FeaturePolicy::createFromParentPolicy(policy1, originB);
+  policy2->setHeaderPolicy("{\"vibrate\": [\"*\"]}");
+  FeaturePolicy* policy3 =
+      FeaturePolicy::createFromParentPolicy(policy2, originA);
+  EXPECT_TRUE(policy1->isFeatureEnabled(&kVibrateFeature));
+  EXPECT_TRUE(policy2->isFeatureEnabled(&kVibrateFeature));
+  EXPECT_TRUE(policy3->isFeatureEnabled(&kVibrateFeature));
+}
+
+TEST_F(FeaturePolicyTest, TestBlockedFrameCannotReenable) {
+  // +--------------------------------------+
+  // |(1)Origin A                           |
+  // |Policy: {"vibrate": ["self"]}         |
+  // | +----------------------------------+ |
+  // | |(2)Origin B                       | |
+  // | |Policy: {"vibrate": ["*"]}        | |
+  // | | +-------------+  +-------------+ | |
+  // | | |(3)Origin A  |  |(4)Origin C  | | |
+  // | | |No Policy    |  |No Policy    | | |
+  // | | +-------------+  +-------------+ | |
+  // | +----------------------------------+ |
+  // +--------------------------------------+
+  // Feature should be enabled at the top level; disabled in all other frames.
+  FeaturePolicy* policy1 =
+      FeaturePolicy::createFromParentPolicy(nullptr, originA);
+  policy1->setHeaderPolicy("{\"vibrate\": [\"self\"]}");
+  FeaturePolicy* policy2 =
+      FeaturePolicy::createFromParentPolicy(policy1, originB);
+  policy2->setHeaderPolicy("{\"vibrate\": [\"*\"]}");
+  FeaturePolicy* policy3 =
+      FeaturePolicy::createFromParentPolicy(policy2, originA);
+  FeaturePolicy* policy4 =
+      FeaturePolicy::createFromParentPolicy(policy2, originC);
+  EXPECT_TRUE(policy1->isFeatureEnabled(&kVibrateFeature));
+  EXPECT_FALSE(policy2->isFeatureEnabled(&kVibrateFeature));
+  EXPECT_FALSE(policy3->isFeatureEnabled(&kVibrateFeature));
+  EXPECT_FALSE(policy4->isFeatureEnabled(&kVibrateFeature));
+}
+
+TEST_F(FeaturePolicyTest, TestEnabledFrameCanDelegate) {
+  // +-------------------------------------------------+
+  // |(1) Origin A                                     |
+  // |Policy: {"vibrate": ["self", "Origin B"]}        |
+  // | +---------------------------------------------+ |
+  // | |(2) Origin B                                 | |
+  // | |Policy: {"vibrate": ["self", "Origin C"]}    | |
+  // | | +-------------+                             | |
+  // | | |(3)Origin C  |                             | |
+  // | | |No Policy    |                             | |
+  // | | +-------------+                             | |
+  // | +---------------------------------------------+ |
+  // +-------------------------------------------------+
+  // Feature should be enabled in all frames.
+  FeaturePolicy* policy1 =
+      FeaturePolicy::createFromParentPolicy(nullptr, originA);
+  policy1->setHeaderPolicy("{\"vibrate\": [\"self\", \"" ORIGIN_B "\"]}");
+  FeaturePolicy* policy2 =
+      FeaturePolicy::createFromParentPolicy(policy1, originB);
+  policy2->setHeaderPolicy("{\"vibrate\": [\"self\", \"" ORIGIN_C "\"]}");
+  FeaturePolicy* policy3 =
+      FeaturePolicy::createFromParentPolicy(policy2, originC);
+  EXPECT_TRUE(policy1->isFeatureEnabled(&kVibrateFeature));
+  EXPECT_TRUE(policy2->isFeatureEnabled(&kVibrateFeature));
+  EXPECT_TRUE(policy3->isFeatureEnabled(&kVibrateFeature));
+}
+
+TEST_F(FeaturePolicyTest, TestEnabledFrameCanDelegateByDefault) {
+  // +-----------------------------------------------+
+  // |(1) Origin A                                   |
+  // |Policy: {"docwrite": ["self", "Origin B"]}     |
+  // | +--------------------+ +--------------------+ |
+  // | |(2) Origin B        | | (4) Origin C       | |
+  // | |No Policy           | | No Policy          | |
+  // | | +-------------+    | |                    | |
+  // | | |(3)Origin C  |    | |                    | |
+  // | | |No Policy    |    | |                    | |
+  // | | +-------------+    | |                    | |
+  // | +--------------------+ +--------------------+ |
+  // +-----------------------------------------------+
+  // Feature should be enabled in frames 1, 2, and 3, and disabled in frame 4.
+  FeaturePolicy* policy1 =
+      FeaturePolicy::createFromParentPolicy(nullptr, originA);
+  policy1->setHeaderPolicy("{\"docwrite\": [\"self\", \"" ORIGIN_B "\"]}");
+  FeaturePolicy* policy2 =
+      FeaturePolicy::createFromParentPolicy(policy1, originB);
+  FeaturePolicy* policy3 =
+      FeaturePolicy::createFromParentPolicy(policy2, originC);
+  FeaturePolicy* policy4 =
+      FeaturePolicy::createFromParentPolicy(policy1, originC);
+  EXPECT_TRUE(policy1->isFeatureEnabled(&kDocumentWrite));
+  EXPECT_TRUE(policy2->isFeatureEnabled(&kDocumentWrite));
+  EXPECT_TRUE(policy3->isFeatureEnabled(&kDocumentWrite));
+  EXPECT_FALSE(policy4->isFeatureEnabled(&kDocumentWrite));
+}
+
+TEST_F(FeaturePolicyTest, TestNonNestedFeaturesDontDelegateByDefault) {
+  // +-----------------------------------------------+
+  // |(1) Origin A                                   |
+  // |Policy: {"vibrate": ["self", "Origin B"]}      |
+  // | +--------------------+ +--------------------+ |
+  // | |(2) Origin B        | | (4) Origin C       | |
+  // | |No Policy           | | No Policy          | |
+  // | | +-------------+    | |                    | |
+  // | | |(3)Origin C  |    | |                    | |
+  // | | |No Policy    |    | |                    | |
+  // | | +-------------+    | |                    | |
+  // | +--------------------+ +--------------------+ |
+  // +-----------------------------------------------+
+  // Feature should be enabled in frames 1 and 2, and disabled in frames 3 and
+  // 4.
+  FeaturePolicy* policy1 =
+      FeaturePolicy::createFromParentPolicy(nullptr, originA);
+  policy1->setHeaderPolicy("{\"vibrate\": [\"self\", \"" ORIGIN_B "\"]}");
+  FeaturePolicy* policy2 =
+      FeaturePolicy::createFromParentPolicy(policy1, originB);
+  FeaturePolicy* policy3 =
+      FeaturePolicy::createFromParentPolicy(policy2, originC);
+  FeaturePolicy* policy4 =
+      FeaturePolicy::createFromParentPolicy(policy1, originC);
+  EXPECT_TRUE(policy1->isFeatureEnabled(&kVibrateFeature));
+  EXPECT_TRUE(policy2->isFeatureEnabled(&kVibrateFeature));
+  EXPECT_FALSE(policy3->isFeatureEnabled(&kVibrateFeature));
+  EXPECT_FALSE(policy4->isFeatureEnabled(&kVibrateFeature));
+}
+
+TEST_F(FeaturePolicyTest, TestFeaturesAreIndependent) {
+  // +---------------------------------------------+
+  // |(1) Origin A                                 |
+  // |Policy: {"vibrate": ["self", "Origin B"],    |
+  // |         "docwrite": ["self"]}               |
+  // | +-----------------------------------------+ |
+  // | |(2) Origin B                             | |
+  // | |Policy: {"vibrate": ["*"],               | |
+  // | |         "docwrite": ["*"]}              | |
+  // | | +-------------+                         | |
+  // | | |(3)Origin C  |                         | |
+  // | | |No Policy    |                         | |
+  // | | +-------------+                         | |
+  // | +-----------------------------------------+ |
+  // +---------------------------------------------+
+  // Vibrate feature should be enabled in all frames; Docwrite feature
+  // should be enabled in frame 1, and disabled in frames 2 and 3.
+  FeaturePolicy* policy1 =
+      FeaturePolicy::createFromParentPolicy(nullptr, originA);
+  policy1->setHeaderPolicy("{\"vibrate\": [\"self\", \"" ORIGIN_B
+                           "\"], \"docwrite\": [\"self\"]}");
+  FeaturePolicy* policy2 =
+      FeaturePolicy::createFromParentPolicy(policy1, originB);
+  policy2->setHeaderPolicy("{\"vibrate\": [\"*\"], \"docwrite\": [\"*\"]}");
+  FeaturePolicy* policy3 =
+      FeaturePolicy::createFromParentPolicy(policy2, originC);
+  EXPECT_TRUE(policy1->isFeatureEnabled(&kVibrateFeature));
+  EXPECT_TRUE(policy1->isFeatureEnabled(&kDocumentWrite));
+  EXPECT_TRUE(policy2->isFeatureEnabled(&kVibrateFeature));
+  EXPECT_FALSE(policy2->isFeatureEnabled(&kDocumentWrite));
+  EXPECT_TRUE(policy3->isFeatureEnabled(&kVibrateFeature));
+  EXPECT_FALSE(policy3->isFeatureEnabled(&kDocumentWrite));
+}
+
+}  // namespace blink