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

cc/test/test_shared_bitmap_manager.cc

Index: cc/test/test_shared_bitmap_manager.cc
diff --git a/cc/test/test_shared_bitmap_manager.cc b/cc/test/test_shared_bitmap_manager.cc
index 604f669af5bbb643ef9aa3a94cf17182e62eed36..479beb625ec684065ac4d4fdd1d8539a024d6695 100644
--- a/cc/test/test_shared_bitmap_manager.cc
+++ b/cc/test/test_shared_bitmap_manager.cc
@@ -16,7 +16,9 @@ class OwnedSharedBitmap : public SharedBitmap {
  public:
   OwnedSharedBitmap(std::unique_ptr<base::SharedMemory> shared_memory,
                     const SharedBitmapId& id)
-      : SharedBitmap(static_cast<uint8_t*>(shared_memory->memory()), id),
+      : SharedBitmap(static_cast<uint8_t*>(shared_memory->memory()),
+                     shared_memory.get(),
+                     id),
         shared_memory_(std::move(shared_memory)) {}
 
   ~OwnedSharedBitmap() override {}
@@ -48,7 +50,7 @@ std::unique_ptr<SharedBitmap> TestSharedBitmapManager::GetSharedBitmapFromId(
   if (bitmap_map_.find(id) == bitmap_map_.end())
     return nullptr;
   uint8_t* pixels = static_cast<uint8_t*>(bitmap_map_[id]->memory());
-  return base::MakeUnique<SharedBitmap>(pixels, id);
+  return base::MakeUnique<SharedBitmap>(pixels, bitmap_map_[id], id);
 }
 
 }  // namespace cc