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

components/viz/display_compositor/host_shared_bitmap_manager.cc

Index: components/viz/display_compositor/host_shared_bitmap_manager.cc
diff --git a/components/viz/display_compositor/host_shared_bitmap_manager.cc b/components/viz/display_compositor/host_shared_bitmap_manager.cc
index d781c9439cbe0cd1ae7d5c2b02fec0f63245f994..e0f6ff316dffff5743e96b506c3eac0b9bcb303e 100644
--- a/components/viz/display_compositor/host_shared_bitmap_manager.cc
+++ b/components/viz/display_compositor/host_shared_bitmap_manager.cc
@@ -12,6 +12,7 @@
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/memory/ref_counted.h"
+#include "base/memory/shared_memory_tracker.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/stringprintf.h"
 #include "base/trace_event/process_memory_dump.h"
@@ -51,6 +52,10 @@ class HostSharedBitmap : public cc::SharedBitmap {
       manager_->FreeSharedMemoryFromMap(id());
   }
 
+  base::SharedMemory* GetSharedMemory() const override {
+    return bitmap_data_->memory.get();
+  }
+
  private:
   scoped_refptr<BitmapData> bitmap_data_;
   HostSharedBitmapManager* manager_;
@@ -176,11 +181,16 @@ bool HostSharedBitmapManager::OnMemoryDump(
                     base::trace_event::MemoryAllocatorDump::kUnitsBytes,
                     bitmap.second->buffer_size);
 
-    // Generate a global GUID used to share this allocation with renderer
-    // processes.
-    auto guid = cc::GetSharedBitmapGUIDForTracing(bitmap.first);
-    pmd->CreateSharedGlobalAllocatorDump(guid);
-    pmd->AddOwnershipEdge(dump->guid(), guid);
+    if (bitmap.second->memory) {
+      base::SharedMemoryTracker::AddOwnershipEdges(pmd, dump->guid(),
+                                                   *bitmap.second->memory);
+    } else {
+      // Generate a global GUID used to share this allocation with renderer
+      // processes.
+      auto guid = cc::GetSharedBitmapGUIDForTracing(bitmap.first);
+      pmd->CreateSharedGlobalAllocatorDump(guid);
+      pmd->AddOwnershipEdge(dump->guid(), guid);
+    }
   }
 
   return true;