Convert performance monitor to the subscription model.

third_party/WebKit/Source/core/timing/PerformanceTest.cpp

Index: third_party/WebKit/Source/core/timing/PerformanceTest.cpp
diff --git a/third_party/WebKit/Source/core/timing/PerformanceTest.cpp b/third_party/WebKit/Source/core/timing/PerformanceTest.cpp
index 8a7bc32b34f7b681871649146d9c2f252829c246..5f2807cca69cd9983d6ef8ad54a45b481fbab9d8 100644
--- a/third_party/WebKit/Source/core/timing/PerformanceTest.cpp
+++ b/third_party/WebKit/Source/core/timing/PerformanceTest.cpp
@@ -16,6 +16,11 @@ class PerformanceTest : public ::testing::Test {
     m_pageHolder = DummyPageHolder::create(IntSize(800, 600));
     m_pageHolder->document().setURL(KURL(KURL(), "https://example.com"));
     m_performance = Performance::create(&m_pageHolder->frame());
+
+    // Create another dummy page holder and pretend this is the iframe.
+    m_anotherPageHolder = DummyPageHolder::create(IntSize(400, 300));
+    m_anotherPageHolder->document().setURL(
+        KURL(KURL(), "https://iframed.com/bar"));
   }
 
   bool observingLongTasks() {
@@ -33,8 +38,20 @@ class PerformanceTest : public ::testing::Test {
     m_performance->m_observerFilterOptions = PerformanceEntry::Invalid;
   }
 
+  LocalFrame* frame() const { return m_pageHolder->document().frame(); }
+
+  LocalFrame* anotherFrame() const {
+    return m_anotherPageHolder->document().frame();
+  }
+
+  String sanitizedAttribution(const HeapHashSet<Member<Frame>>& frames,
+                              Frame* observerFrame) {
+    return Performance::sanitizedAttribution(frames, observerFrame).first;
+  }
+
   Persistent<Performance> m_performance;
   std::unique_ptr<DummyPageHolder> m_pageHolder;
+  std::unique_ptr<DummyPageHolder> m_anotherPageHolder;
 };
 
 TEST_F(PerformanceTest, LongTaskObserverInstrumentation) {
@@ -51,4 +68,29 @@ TEST_F(PerformanceTest, LongTaskObserverInstrumentation) {
   m_performance->updateLongTaskInstrumentation();
   EXPECT_FALSE(observingLongTasks());
 }
+
+TEST_F(PerformanceTest, SanitizedLongTaskName) {
+  HeapHashSet<Member<Frame>> frameContexts;
+  // Unable to attribute, when no execution contents are available.
+  EXPECT_EQ("unknown", sanitizedAttribution(frameContexts, frame()));
+
+  // Attribute for same context (and same origin).
+  frameContexts.add(frame());
+  EXPECT_EQ("same-origin", sanitizedAttribution(frameContexts, frame()));
+
+  // Unable to attribute, when multiple script execution contents are involved.
+  frameContexts.add(anotherFrame());
+  EXPECT_EQ("multiple-contexts", sanitizedAttribution(frameContexts, frame()));
+}
+
+TEST_F(PerformanceTest, SanitizedLongTaskName_CrossOrigin) {
+  HeapHashSet<Member<Frame>> frameContexts;
+  // Unable to attribute, when no execution contents are available.
+  EXPECT_EQ("unknown", sanitizedAttribution(frameContexts, frame()));
+
+  // Attribute for same context (and same origin).
+  frameContexts.add(anotherFrame());
+  EXPECT_EQ("cross-origin-unreachable",
+            sanitizedAttribution(frameContexts, frame()));
+}
 }