Report trace buffer usage as number of events, not only percentage

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 69b574305e2868f444d874983978024c4d3ddc55..eb00f803a7672e773c644aa1b3dfb8747927b073 100644
--- a/base/debug/trace_event_unittest.cc
+++ b/base/debug/trace_event_unittest.cc
@@ -1367,7 +1367,12 @@ TEST_F(TraceEventTestFixture, StaticStringVsString) {
   TraceLog* tracer = TraceLog::GetInstance();
   // Make sure old events are flushed:
   EndTraceAndFlush();
-  EXPECT_EQ(0u, tracer->GetEventsSize());
+  {
+    float unused;
+    size_t num_events;
+    tracer->GetBufferUsage(&unused, &num_events);
+    EXPECT_EQ(0u, num_events);
+  }
   const unsigned char* category_group_enabled =
       TRACE_EVENT_API_GET_CATEGORY_GROUP_ENABLED("cat");
 
@@ -1384,7 +1389,9 @@ TEST_F(TraceEventTestFixture, StaticStringVsString) {
             TRACE_EVENT_PHASE_INSTANT, category_group_enabled, "name2", 0, 0,
             "arg1", TRACE_STR_COPY("argval"),
             "arg2", TRACE_STR_COPY("argval"));
-    size_t num_events = tracer->GetEventsSize();
+    float unused;
+    size_t num_events;
+    tracer->GetBufferUsage(&unused, &num_events);
     EXPECT_GT(num_events, 1u);
     const TraceEvent* event1 = tracer->GetEventByHandle(handle1);
     const TraceEvent* event2 = tracer->GetEventByHandle(handle2);
@@ -1414,7 +1421,9 @@ TEST_F(TraceEventTestFixture, StaticStringVsString) {
             TRACE_EVENT_PHASE_INSTANT, category_group_enabled, "name2", 0, 0,
             "arg1", TRACE_STR_COPY(str1),
             "arg2", TRACE_STR_COPY(str2));
-    size_t num_events = tracer->GetEventsSize();
+    float unused;
+    size_t num_events;
+    tracer->GetBufferUsage(&unused, &num_events);
     EXPECT_GT(num_events, 1u);
     const TraceEvent* event1 = tracer->GetEventByHandle(handle1);
     const TraceEvent* event2 = tracer->GetEventByHandle(handle2);