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

base/trace_event/heap_profiler_allocation_context_tracker.h

Index: base/trace_event/heap_profiler_allocation_context_tracker.h
diff --git a/base/trace_event/heap_profiler_allocation_context_tracker.h b/base/trace_event/heap_profiler_allocation_context_tracker.h
index 454200c474ee32be54c15e234cfa1753a8e580ce..ae5f73af432bc9ecfb4aa87c8734238176490fe3 100644
--- a/base/trace_event/heap_profiler_allocation_context_tracker.h
+++ b/base/trace_event/heap_profiler_allocation_context_tracker.h
@@ -10,7 +10,6 @@
 #include "base/atomicops.h"
 #include "base/base_export.h"
 #include "base/debug/stack_trace.h"
-#include "base/logging.h"
 #include "base/macros.h"
 #include "base/trace_event/heap_profiler_allocation_context.h"
 
@@ -30,6 +29,17 @@ class BASE_EXPORT AllocationContextTracker {
     NATIVE_STACK    // GetContextSnapshot() returns native (real) stack trace
   };
 
+  // Stack frame constructed from trace events in codebase.
+  struct BASE_EXPORT PseudoStackFrame {
+    const char* trace_event_category;
+    const char* trace_event_name;
+
+    bool operator==(const PseudoStackFrame& other) const {
+      return trace_event_category == other.trace_event_category &&
+             trace_event_name == other.trace_event_name;
+    }
+  };
+
   // Globally sets capturing mode.
   // TODO(primiano): How to guard against *_STACK -> DISABLED -> *_STACK?
   static void SetCaptureMode(CaptureMode mode);
@@ -69,10 +79,10 @@ class BASE_EXPORT AllocationContextTracker {
   }
 
   // Pushes a frame onto the thread-local pseudo stack.
-  void PushPseudoStackFrame(const char* trace_event_name);
+  void PushPseudoStackFrame(PseudoStackFrame stack_frame);
 
   // Pops a frame from the thread-local pseudo stack.
-  void PopPseudoStackFrame(const char* trace_event_name);
+  void PopPseudoStackFrame(PseudoStackFrame stack_frame);
 
   // Push and pop current task's context. A stack is used to support nested
   // tasks and the top of the stack will be used in allocation context.
@@ -90,7 +100,7 @@ class BASE_EXPORT AllocationContextTracker {
   static subtle::Atomic32 capture_mode_;
 
   // The pseudo stack where frames are |TRACE_EVENT| names.
-  std::vector<const char*> pseudo_stack_;
+  std::vector<PseudoStackFrame> pseudo_stack_;
 
   // The thread name is used as the first entry in the pseudo stack.
   const char* thread_name_;