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

cc/resources/resource_provider.cc

Index: cc/resources/resource_provider.cc
diff --git a/cc/resources/resource_provider.cc b/cc/resources/resource_provider.cc
index 6547109d3a5f35a9a409073f1a0bc3d6b93041c2..9957cf744a416074ea63c2fe46edece3b3b21dd5 100644
--- a/cc/resources/resource_provider.cc
+++ b/cc/resources/resource_provider.cc
@@ -13,6 +13,7 @@
 
 #include "base/atomic_sequence_num.h"
 #include "base/macros.h"
+#include "base/memory/shared_memory_tracker.h"
 #include "base/metrics/histogram.h"
 #include "base/numerics/safe_math.h"
 #include "base/stl_util.h"
@@ -2127,10 +2128,12 @@ bool ResourceProvider::OnMemoryDump(
     // Resources may be shared across processes and require a shared GUID to
     // prevent double counting the memory.
     base::trace_event::MemoryAllocatorDumpGuid guid;
+    base::SharedMemoryHandle shared_memory_handle;
     switch (resource.type) {
       case RESOURCE_TYPE_GPU_MEMORY_BUFFER:
         guid = gfx::GetGpuMemoryBufferGUIDForTracing(
             tracing_process_id, resource.gpu_memory_buffer->GetHandle().id);
+        shared_memory_handle = resource.gpu_memory_buffer->GetHandle().handle;
         break;
       case RESOURCE_TYPE_GL_TEXTURE:
         DCHECK(resource.gl_id);
@@ -2142,6 +2145,9 @@ bool ResourceProvider::OnMemoryDump(
       case RESOURCE_TYPE_BITMAP:
         DCHECK(resource.has_shared_bitmap_id);
         guid = GetSharedBitmapGUIDForTracing(resource.shared_bitmap_id);
+        auto shared_memory = resource.shared_bitmap->shared_memory();
+        if (shared_memory)
+          shared_memory_handle = shared_memory->handle();
         break;
     }
 
@@ -2150,6 +2156,10 @@ bool ResourceProvider::OnMemoryDump(
     const int kImportance = 2;
     pmd->CreateSharedGlobalAllocatorDump(guid);
     pmd->AddOwnershipEdge(dump->guid(), guid, kImportance);
+    if (shared_memory_handle != base::SharedMemory::NULLHandle()) {
+      base::SharedMemoryTracker::AddOwnershipEdgeToSharedGlobalDump(
+          pmd, guid, shared_memory_handle, total_bytes);
+    }
   }
 
   return true;