[tracing] Add trace events filtering predicate for heap profiler

base/trace_event/heap_profiler_allocation_context_tracker_unittest.cc

Index: base/trace_event/heap_profiler_allocation_context_tracker_unittest.cc
diff --git a/base/trace_event/heap_profiler_allocation_context_tracker_unittest.cc b/base/trace_event/heap_profiler_allocation_context_tracker_unittest.cc
index 3064a6a711792e68c41976ce541c591dd586d588..74b5dc1e88d97393d7fef0bba99b1472c71e01de 100644
--- a/base/trace_event/heap_profiler_allocation_context_tracker_unittest.cc
+++ b/base/trace_event/heap_profiler_allocation_context_tracker_unittest.cc
@@ -63,7 +63,14 @@ void AssertBacktraceContainsOnlyThreadName() {
 class AllocationContextTrackerTest : public testing::Test {
  public:
   void SetUp() override {
-    TraceConfig config("");
+    TraceConfig config(
+        "{ \"event_filters\":[{"
+          "\"included_categories\":["
+            "\"Testing\","
+            "\"disabled-by-default-Testing\""
+          "],"
+          "\"filter_predicate\":\"heap_profiler_predicate\""
+        "}] }");
     TraceLog::GetInstance()->SetEnabled(config, TraceLog::RECORDING_MODE);
     AllocationContextTracker::SetCaptureMode(
         AllocationContextTracker::CaptureMode::PSEUDO_STACK);
@@ -106,6 +113,12 @@ TEST_F(AllocationContextTrackerTest, PseudoStackScopedTrace) {
       AssertBacktraceEquals(frame_ce);
     }
 
+    {
+      TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("Testing"), kCupcake);
+      StackFrame frame_ce[] = {t, c, c};
+      AssertBacktraceEquals(frame_ce);
+    }
+
     AssertBacktraceEquals(frame_c);
   }