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

cc/resources/shared_bitmap.cc

 // Copyright 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 "cc/resources/shared_bitmap.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/logging.h"
 #include "base/numerics/safe_math.h"
 #include "base/rand_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/stringprintf.h"
 
 namespace cc {
 
-SharedBitmap::SharedBitmap(uint8_t* pixels, const SharedBitmapId& id)
-    : pixels_(pixels), id_(id) {}
+SharedBitmap::SharedBitmap(uint8_t* pixels,
+                           base::SharedMemory* shared_memory,
+                           const SharedBitmapId& id)
+    : pixels_(pixels), shared_memory_(shared_memory), id_(id) {}
 
 SharedBitmap::~SharedBitmap() {
 }
 
 // static
 bool SharedBitmap::SizeInBytes(const gfx::Size& size, size_t* size_in_bytes) {
   if (size.IsEmpty())
     return false;
   base::CheckedNumeric<size_t> s = 4;
   s *= size.width();
@@ skipping 41 matching lines @@
 }
 
 base::trace_event::MemoryAllocatorDumpGuid GetSharedBitmapGUIDForTracing(
     const SharedBitmapId& bitmap_id) {
   auto bitmap_id_hex = base::HexEncode(bitmap_id.name, sizeof(bitmap_id.name));
   return base::trace_event::MemoryAllocatorDumpGuid(
       base::StringPrintf("sharedbitmap-x-process/%s", bitmap_id_hex.c_str()));
 }
 
 }  // namespace cc