LongTaskTiming: add idl, Experiment flag, PerformanceEntry and basic implementation

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

 // 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 "core/timing/Performance.h"
 
 #include "core/timing/PerformanceBase.h"
+#include "core/timing/PerformanceLongTaskTiming.h"
 #include "core/timing/PerformanceObserver.h"
 #include "core/timing/PerformanceObserverCallback.h"
+#include "core/timing/PerformanceObserverInit.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace blink {
 
 class TestPerformanceBase : public PerformanceBase {
 public:
     TestPerformanceBase() : PerformanceBase(0) {}
     ~TestPerformanceBase() {}
 
     ExecutionContext* getExecutionContext() const override { return nullptr; }
 
     int numActiveObservers() { return m_activeObservers.size(); }
 
     int numObservers() { return m_observers.size(); }
 
+    int numLongTaskTimingEntries()
+    {
+        return m_longTaskTimingBuffer.size();
+    }
+
     DEFINE_INLINE_TRACE()
     {
         PerformanceBase::trace(visitor);
     }
 };
 
 class MockPerformanceObserverCallback : public PerformanceObserverCallback {
 public:
     MockPerformanceObserverCallback() {}
     ~MockPerformanceObserverCallback() {}
@@ skipping 46 matching lines @@
 
     m_base->activateObserver(*m_observer.get());
     EXPECT_EQ(1, m_base->numObservers());
     EXPECT_EQ(1, m_base->numActiveObservers());
 
     m_base->unregisterPerformanceObserver(*m_observer.get());
     EXPECT_EQ(0, m_base->numObservers());
     EXPECT_EQ(0, m_base->numActiveObservers());
 }
 
+TEST_F(PerformanceBaseTest, AddLongTaskTiming)
+{
+    // Add a long task entry, but no observer registered.
+    m_base->addLongTaskTiming(1234, 5678, "www.foo.com/bar");
+    EXPECT_EQ(0, m_base->numLongTaskTimingEntries()); // has no effect
+
+    // Make an observer for longtask
+    NonThrowableExceptionState exceptionState;
+    PerformanceObserverInit options;
+    Vector<String> entryTypeVec;
+    entryTypeVec.append("longtask");
+    options.setEntryTypes(entryTypeVec);
+    m_observer->observe(options, exceptionState);
+
+    // Add a long task entry
+    m_base->addLongTaskTiming(1234, 5678, "www.foo.com/bar");
+    EXPECT_EQ(1, m_base->numLongTaskTimingEntries()); // added an entry
+}
+
 } // namespace blink