Update from https://crrev.com/328418

base/trace_event/process_memory_dump.h

 // 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.
 
 #ifndef BASE_TRACE_EVENT_PROCESS_MEMORY_DUMP_H_
 #define BASE_TRACE_EVENT_PROCESS_MEMORY_DUMP_H_
 
 #include "base/base_export.h"
 #include "base/containers/hash_tables.h"
 #include "base/containers/small_map.h"
@@ skipping 34 matching lines @@
   bool has_process_totals() const { return has_process_totals_; }
   void set_has_process_totals() { has_process_totals_ = true; }
 
   ProcessMemoryMaps* process_mmaps() { return &process_mmaps_; }
   bool has_process_mmaps() const { return has_process_mmaps_; }
   void set_has_process_mmaps() { has_process_mmaps_ = true; }
 
   // Creates a new MemoryAllocatorDump with the given name and returns the
   // empty object back to the caller.
   // Arguments:
-  //   allocator_name: a name that univocally identifies allocator dumps
-  //     produced by this provider. It acts as a type w.r.t. the allocator
-  //     attributes, in the sense that all the MAD with the same allocator_name
-  //     are expected to have the same attributes.
-  //   heap_name, either:
-  //     - kRootHeap: if the allocator has only one default heap.
-  //     - a string identifing a heap name (e.g., isolate1, isolate2 ...). It is
-  //       possible to specify nesting by using a path-like string (e.g.,
-  //       isolate1/heap_spaceX, isolate1/heap_spaceY, isolate2/heap_spaceX).
-  // The tuple (|allocator_name|, |heap_name|) is unique inside a PMD.
+  //   absolute_name: a name that uniquely identifies allocator dumps produced
+  //       by this provider. It is possible to specify nesting by using a
+  //       path-like string (e.g., v8/isolate1/heap1, v8/isolate1/heap2).
+  //       Leading or trailing slashes are not allowed.
   // ProcessMemoryDump handles the memory ownership of its MemoryAllocatorDumps.
-  MemoryAllocatorDump* CreateAllocatorDump(const std::string& allocator_name,
-                                           const std::string& heap_name);
+  MemoryAllocatorDump* CreateAllocatorDump(const std::string& absolute_name);
 
   // Looks up a MemoryAllocatorDump given its allocator and heap names, or
   // nullptr if not found.
-  MemoryAllocatorDump* GetAllocatorDump(const std::string& allocator_name,
-                                        const std::string& heap_name) const;
+  MemoryAllocatorDump* GetAllocatorDump(const std::string& absolute_name) const;
 
   // Returns the map of the MemoryAllocatorDumps added to this dump.
   const AllocatorDumpsMap& allocator_dumps() const { return allocator_dumps_; }
 
   const scoped_refptr<MemoryDumpSessionState>& session_state() const {
     return session_state_;
   }
 
  private:
   ProcessMemoryTotals process_totals_;
@@ skipping 10 matching lines @@
   // State shared among all PMDs instances created in a given trace session.
   scoped_refptr<MemoryDumpSessionState> session_state_;
 
   DISALLOW_COPY_AND_ASSIGN(ProcessMemoryDump);
 };
 
 }  // namespace trace_event
 }  // namespace base
 
 #endif  // BASE_TRACE_EVENT_PROCESS_MEMORY_DUMP_H_