Add OnBeforeTraceLogDisabled notification to EnabledStateObserver

base/debug/trace_event_unittest.cc

Index: base/debug/trace_event_unittest.cc
diff --git a/base/debug/trace_event_unittest.cc b/base/debug/trace_event_unittest.cc
index 581906b72e1d43e55a805210c57f6841cf90afa4..92328926d2835473f73e6f2701a07cb6724d4ed5 100644
--- a/base/debug/trace_event_unittest.cc
+++ b/base/debug/trace_event_unittest.cc
@@ -898,6 +898,7 @@ class MockEnabledStateChangedObserver :
  public:
   MOCK_METHOD0(OnTraceLogEnabled, void());
   MOCK_METHOD0(OnTraceLogDisabled, void());
+  MOCK_METHOD0(OnBeforeTraceLogDisabled, void());
 };
 
 TEST_F(TraceEventTestFixture, EnabledObserverFiresOnEnable) {
@@ -931,6 +932,8 @@ TEST_F(TraceEventTestFixture, EnabledObserverDoesntFireOnSecondEnable) {
       .Times(0);
   EXPECT_CALL(observer, OnTraceLogDisabled())
       .Times(0);
+  EXPECT_CALL(observer, OnBeforeTraceLogDisabled())
+      .Times(0);
   TraceLog::GetInstance()->SetEnabled(
       CategoryFilter("*"),
       TraceLog::RECORDING_MODE,
@@ -962,6 +965,8 @@ TEST_F(TraceEventTestFixture, EnabledObserverFiresOnFirstDisable) {
       .Times(0);
   EXPECT_CALL(observer, OnTraceLogDisabled())
       .Times(1);
+  EXPECT_CALL(observer, OnBeforeTraceLogDisabled())
+      .Times(1);
   TraceLog::GetInstance()->SetDisabled();
   testing::Mock::VerifyAndClear(&observer);
 
@@ -981,6 +986,8 @@ TEST_F(TraceEventTestFixture, EnabledObserverFiresOnDisable) {
 
   EXPECT_CALL(observer, OnTraceLogDisabled())
       .Times(1);
+  EXPECT_CALL(observer, OnBeforeTraceLogDisabled())
+      .Times(1);
   TraceLog::GetInstance()->SetDisabled();
   testing::Mock::VerifyAndClear(&observer);
 
@@ -1003,6 +1010,10 @@ class AfterStateChangeEnabledStateObserver
   virtual void OnTraceLogDisabled() OVERRIDE {
     EXPECT_FALSE(TraceLog::GetInstance()->IsEnabled());
   }
+
+  virtual void OnBeforeTraceLogDisabled() OVERRIDE {
+    EXPECT_TRUE(TraceLog::GetInstance()->IsEnabled());
+  }
 };
 
 TEST_F(TraceEventTestFixture, ObserversFireAfterStateChange) {