Heap Profiler: Add trace category group names as type names for allocations

base/trace_event/heap_profiler_allocation_context_tracker_unittest.cc

 // Copyright 2015 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 <stddef.h>
 
 #include <iterator>
 
 #include "base/memory/ref_counted.h"
 #include "base/pending_task.h"
@@ skipping 233 matching lines @@
   {
     AllocationContext ctx =
         AllocationContextTracker::GetInstanceForCurrentThread()
             ->GetContextSnapshot();
     ASSERT_EQ(t, ctx.backtrace.frames[0]);
     ASSERT_EQ(c, ctx.backtrace.frames[1]);
     ASSERT_EQ(f, ctx.backtrace.frames[11]);
   }
 }
 
-TEST_F(AllocationContextTrackerTest, TrackTaskContext) {
+TEST_F(AllocationContextTrackerTest, TrackCategoryName) {
   const char kContext1[] = "context1";
   const char kContext2[] = "context2";
   {
     // The context from the scoped task event should be used as type name.
     TRACE_HEAP_PROFILER_API_SCOPED_TASK_EXECUTION event1(kContext1);
     AllocationContext ctx1 =
         AllocationContextTracker::GetInstanceForCurrentThread()
             ->GetContextSnapshot();
     ASSERT_EQ(kContext1, ctx1.type_name);
 
     // In case of nested events, the last event's context should be used.
     TRACE_HEAP_PROFILER_API_SCOPED_TASK_EXECUTION event2(kContext2);
     AllocationContext ctx2 =
         AllocationContextTracker::GetInstanceForCurrentThread()
             ->GetContextSnapshot();
     ASSERT_EQ(kContext2, ctx2.type_name);
   }
 
+  {
+    // Type should be category name of the last seen trace event.
+    TRACE_EVENT0("Testing", kCupcake);
+    AllocationContext ctx1 =
+        AllocationContextTracker::GetInstanceForCurrentThread()
+            ->GetContextSnapshot();
+    ASSERT_EQ("Testing", std::string(ctx1.type_name));
+
+    TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("Testing"), kCupcake);
+    AllocationContext ctx2 =
+        AllocationContextTracker::GetInstanceForCurrentThread()
+            ->GetContextSnapshot();
+    ASSERT_EQ(TRACE_DISABLED_BY_DEFAULT("Testing"),
+              std::string(ctx2.type_name));
+  }
+
   // Type should be nullptr without task event.
   AllocationContext ctx =
       AllocationContextTracker::GetInstanceForCurrentThread()
           ->GetContextSnapshot();
   ASSERT_FALSE(ctx.type_name);
 }
 
 TEST_F(AllocationContextTrackerTest, IgnoreAllocationTest) {
   TRACE_EVENT0("Testing", kCupcake);
   TRACE_EVENT0("Testing", kDonut);
   HEAP_PROFILER_SCOPED_IGNORE;
   AllocationContext ctx =
       AllocationContextTracker::GetInstanceForCurrentThread()
           ->GetContextSnapshot();
   const StringPiece kTracingOverhead("tracing_overhead");
   ASSERT_EQ(kTracingOverhead,
             static_cast<const char*>(ctx.backtrace.frames[0].value));
   ASSERT_EQ(1u, ctx.backtrace.frame_count);
 }
 
 }  // namespace trace_event
 }  // namespace base