scheduler: Detect load RAIL mode

third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl_unittest.cc

Index: third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl_unittest.cc
diff --git a/third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl_unittest.cc b/third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl_unittest.cc
index 8ed739bcce408af3e58d1b9c824b5ba77ed7cc54..5134ce5483230f2b30adc788116764e8c0af972c 100644
--- a/third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl_unittest.cc
+++ b/third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl_unittest.cc
@@ -3295,6 +3295,21 @@ TEST_F(RendererSchedulerImplTest, TestIdleRAILMode) {
   scheduler_->SetRAILModeObserver(nullptr);
 }
 
+TEST_F(RendererSchedulerImplTest, TestLoadRAILMode) {
+  MockRAILModeObserver observer;
+  scheduler_->SetRAILModeObserver(&observer);
+  EXPECT_CALL(observer, OnRAILModeChanged(v8::PERFORMANCE_ANIMATION));
+  EXPECT_CALL(observer, OnRAILModeChanged(v8::PERFORMANCE_LOAD));
+
+  scheduler_->OnNavigationStarted();
+  EXPECT_EQ(v8::PERFORMANCE_LOAD, RAILMode());
+  EXPECT_EQ(UseCase::LOADING, ForceUpdatePolicyAndGetCurrentUseCase());
+  scheduler_->OnFirstMeaningfulPaint();
+  EXPECT_EQ(UseCase::NONE, ForceUpdatePolicyAndGetCurrentUseCase());
+  EXPECT_EQ(v8::PERFORMANCE_ANIMATION, RAILMode());
+  scheduler_->SetRAILModeObserver(nullptr);
+}
+
 TEST_F(RendererSchedulerImplTest, UnthrottledTaskRunner) {
   // Ensure neither suspension nor timer task throttling affects an unthrottled
   // task runner.