Add support for TraceEvent before the native library is loaded.

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 30ad797e060d96f023da990d15bb6c228a42b5d4..99b669cf97d16a6a37aea6b64a61914a87c73c88 100644
--- a/base/debug/trace_event_unittest.cc
+++ b/base/debug/trace_event_unittest.cc
@@ -3010,6 +3010,32 @@ TEST_F(TraceEventTestFixture, SyntheticDelayConfigurationToString) {
   EXPECT_EQ(config, filter.ToString());
 }
 
+TEST_F(TraceEventTestFixture, AddCustomTraceEvent) {
+  TraceLog* const tracer = TraceLog::GetInstance();
+  // Make sure old events are flushed.
+  EndTraceAndFlush();
+  EXPECT_EQ(0u, tracer->GetEventsSize());
+  const unsigned char* category_group_enabled =
+      TRACE_EVENT_API_GET_CATEGORY_GROUP_ENABLED("Java");
+
+  {
+    BeginTrace();
+    EXPECT_TRUE(TraceLog::IsCategoryGroupEnabledForRecordingMode(
+                    category_group_enabled));
+    TraceEventHandle handle = tracer->AddCustomTraceEvent(
+        TRACE_EVENT_PHASE_BEGIN, category_group_enabled, "name1", 0,
+        base::TimeTicks::Now());
+    size_t num_events = tracer->GetEventsSize();
+    EXPECT_GT(num_events, 1u);
+    const TraceEvent* event1 = tracer->GetEventByHandle(handle);
+    ASSERT_TRUE(event1);
+    EXPECT_STREQ("name1", event1->name());
+    EXPECT_TRUE(event1->parameter_copy_storage() != NULL);
+    EXPECT_GT(event1->parameter_copy_storage()->size(), 0u);
+    EndTraceAndFlush();
+  }
+}
+
 TEST(TraceOptionsTest, TraceOptionsFromString) {
   TraceOptions options;
   EXPECT_TRUE(options.SetFromString("record-until-full"));
@@ -3088,6 +3114,5 @@ TEST(TraceOptionsTest, TraceOptionsToString) {
   }
 }
 
-
 }  // namespace debug
 }  // namespace base