[WIP] Add SharedMemoryTracker to dump base::SharedMemory usage

gpu/command_buffer/service/buffer_manager.cc

 // Copyright (c) 2012 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 "gpu/command_buffer/service/buffer_manager.h"
 
 #include <stdint.h>
 
 #include <limits>
 
 #include "base/format_macros.h"
 #include "base/logging.h"
+#include "base/memory/shared_memory_tracker.h"
 #include "base/numerics/safe_math.h"
 #include "base/strings/stringprintf.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "base/trace_event/memory_dump_manager.h"
 #include "base/trace_event/trace_event.h"
 #include "gpu/command_buffer/common/gles2_cmd_utils.h"
 #include "gpu/command_buffer/service/context_state.h"
 #include "gpu/command_buffer/service/error_state.h"
 #include "gpu/command_buffer/service/feature_info.h"
 #include "gpu/command_buffer/service/memory_tracking.h"
@@ skipping 707 matching lines @@
     const auto& buffer = buffer_entry.second;
 
     std::string dump_name =
         base::StringPrintf("gpu/gl/buffers/share_group_%" PRIu64 "/buffer_%d",
                            share_group_tracing_guid, client_buffer_id);
     MemoryAllocatorDump* dump = pmd->CreateAllocatorDump(dump_name);
     dump->AddScalar(MemoryAllocatorDump::kNameSize,
                     MemoryAllocatorDump::kUnitsBytes,
                     static_cast<uint64_t>(buffer->size()));
 
-    auto guid = gl::GetGLBufferGUIDForTracing(share_group_tracing_guid,
-                                              client_buffer_id);
-    pmd->CreateSharedGlobalAllocatorDump(guid);
-    pmd->AddOwnershipEdge(dump->guid(), guid);
+    auto* mapped_range = buffer->GetMappedRange();
+    if (!mapped_range)
+      continue;
+    auto* shared_memory = mapped_range->shm->backing()->shared_memory();
+    if (shared_memory) {
+      base::SharedMemoryTracker::AddOwnershipEdges(pmd, dump->guid(),
+                                                   *shared_memory);
+    } else {
+      auto guid = gl::GetGLBufferGUIDForTracing(share_group_tracing_guid,
+                                                client_buffer_id);
+      pmd->CreateSharedGlobalAllocatorDump(guid);
+      pmd->AddOwnershipEdge(dump->guid(), guid);
+    }
   }
 
   return true;
 }
 
 Buffer* BufferManager::RequestBufferAccess(ContextState* context_state,
                                            GLenum target,
                                            GLintptr offset,
                                            GLsizeiptr size,
                                            const char* func_name) {
@@ skipping 123 matching lines @@
                                          message_tag.c_str());
     ERRORSTATE_SET_GL_ERROR(error_state, GL_INVALID_OPERATION, func_name,
                             msg.c_str());
     return false;
   }
   return true;
 }
 
 }  // namespace gles2
 }  // namespace gpu