Add a sampling tracing to RenderWidget::DoDeferredUpdate

base/debug/trace_event_unittest.cc

 // Copyright (c) 2012 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 "base/debug/trace_event_unittest.h"
 
 #include <cstdlib>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 1784 matching lines @@
 
   event_watch_notification_ = 0;
   TraceLog::GetInstance()->SetEnabled(
       CategoryFilter("*"),
       TraceLog::Options(TraceLog::RECORD_UNTIL_FULL |
                         TraceLog::ENABLE_SAMPLING));
 
   WaitableEvent* sampled = new WaitableEvent(false, false);
   TraceLog::GetInstance()->InstallWaitableEventForSamplingTesting(sampled);
 
-  TRACE_EVENT_SAMPLE_STATE(1, "cc", "Stuff");
+  TRACE_EVENT_SAMPLING_STATE0("cc", "Stuff");
   sampled->Wait();
-  TRACE_EVENT_SAMPLE_STATE(1, "cc", "Things");
+  TRACE_EVENT_SAMPLING_STATE0("cc", "Things");
   sampled->Wait();
 
   EndTraceAndFlush();
 
   // Make sure we hit at least once.
   EXPECT_TRUE(FindNamePhase("Stuff", "P"));
   EXPECT_TRUE(FindNamePhase("Things", "P"));
 }
 #endif  // !CHROME_SPLIT_DLL
 
+// Not supported in split dll build. http://crbug.com/237249
+#if !defined(CHROME_SPLIT_DLL)
+TEST_F(TraceEventTestFixture, TraceSamplingScope) {
+  ManualTestSetUp();
+
+  event_watch_notification_ = 0;
+  TraceLog::GetInstance()->SetEnabled(
+      CategoryFilter("*"),
+      TraceLog::Options(TraceLog::RECORD_UNTIL_FULL |
+                        TraceLog::ENABLE_SAMPLING));
+
+  WaitableEvent* sampled = new WaitableEvent(false, false);
+  TraceLog::GetInstance()->InstallWaitableEventForSamplingTesting(sampled);
+
+  TraceEventSamplingState0Scope scope("AAA");
+  sampled->Wait();
+  {
+      EXPECT_STREQ(TraceEventSamplingState0Scope::current(), "AAA");
+      TraceEventSamplingState0Scope scope2("BBB");
+      sampled->Wait();
+      EXPECT_STREQ(TraceEventSamplingState0Scope::current(), "BBB");
+  }
+  sampled->Wait();
+  {
+      EXPECT_STREQ(TraceEventSamplingState0Scope::current(), "AAA");
+      TraceEventSamplingState0Scope scope2("CCC");
+      sampled->Wait();
+      EXPECT_STREQ(TraceEventSamplingState0Scope::current(), "CCC");
+  }
+  sampled->Wait();
+  {
+      EXPECT_STREQ(TraceEventSamplingState0Scope::current(), "AAA");
+      TraceEventSamplingState0Scope::forceCurrent("DDD");
+      sampled->Wait();
+      EXPECT_STREQ(TraceEventSamplingState0Scope::current(), "DDD");
+  }
+  sampled->Wait();
+  EXPECT_STREQ(TraceEventSamplingState0Scope::current(), "DDD");
+
+  EndTraceAndFlush();
+}
+#endif  // !CHROME_SPLIT_DLL
+
 class MyData : public base::debug::ConvertableToTraceFormat {
  public:
   MyData() {}
   virtual ~MyData() {}
 
   virtual void AppendAsTraceFormat(std::string* out) const OVERRIDE {
     out->append("{\"foo\":1}");
   }
 
  private:
@@ skipping 269 matching lines @@
   EXPECT_TRUE(CategoryFilter::IsEmptyOrContainsLeadingOrTrailingWhitespace(
       "   bad_category   "));
   EXPECT_TRUE(CategoryFilter::IsEmptyOrContainsLeadingOrTrailingWhitespace(
       ""));
   EXPECT_FALSE(CategoryFilter::IsEmptyOrContainsLeadingOrTrailingWhitespace(
       "good_category"));
 }
 
 }  // namespace debug
 }  // namespace base