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

services/ui/public/cpp/bitmap/child_shared_bitmap_manager.cc

 // Copyright (c) 2013 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 "services/ui/public/cpp/bitmap/child_shared_bitmap_manager.h"
 
 #include <stddef.h>
 
 #include <utility>
 
@@ skipping 13 matching lines @@
 class ChildSharedBitmap : public cc::SharedBitmap {
  public:
   ChildSharedBitmap(
       const scoped_refptr<cc::mojom::ThreadSafeSharedBitmapManagerAssociatedPtr>
           shared_bitmap_manager_ptr,
       base::SharedMemory* shared_memory,
       const cc::SharedBitmapId& id)
       : cc::SharedBitmap(static_cast<uint8_t*>(shared_memory->memory()), id),
         shared_bitmap_manager_ptr_(shared_bitmap_manager_ptr) {}
 
+  // TODO(hajimehoshi): shared bitmpa is not reffered in this case?
+
   ChildSharedBitmap(
       const scoped_refptr<cc::mojom::ThreadSafeSharedBitmapManagerAssociatedPtr>
           shared_bitmap_manager_ptr,
       std::unique_ptr<base::SharedMemory> shared_memory_holder,
       const cc::SharedBitmapId& id)
       : ChildSharedBitmap(shared_bitmap_manager_ptr,
                           shared_memory_holder.get(),
                           id) {
     shared_memory_holder_ = std::move(shared_memory_holder);
   }
 
   ~ChildSharedBitmap() override {
     (*shared_bitmap_manager_ptr_)->DidDeleteSharedBitmap(id());
   }
 
+  base::SharedMemory* GetSharedMemory() const override {
+    return shared_memory_holder_.get();
+  }
+
  private:
   scoped_refptr<cc::mojom::ThreadSafeSharedBitmapManagerAssociatedPtr>
       shared_bitmap_manager_ptr_;
   std::unique_ptr<base::SharedMemory> shared_memory_holder_;
 };
 
 // Collect extra information for debugging bitmap creation failures.
 void CollectMemoryUsageAndDie(const gfx::Size& size, size_t alloc_size) {
 #if defined(OS_WIN)
   int width = size.width();
@@ skipping 97 matching lines @@
   }
 
   mojo::ScopedSharedBufferHandle buffer_handle = mojo::WrapSharedMemoryHandle(
       handle_to_send, memory->mapped_size(), true /* read_only */);
 
   (*shared_bitmap_manager_ptr_)
       ->DidAllocateSharedBitmap(std::move(buffer_handle), id);
 }
 
 }  // namespace ui