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

gpu/ipc/client/gpu_memory_buffer_impl_shared_memory.cc

 // Copyright 2014 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 "gpu/ipc/client/gpu_memory_buffer_impl_shared_memory.h"
 
 #include <stdint.h>
 #include <utility>
 
 #include "base/bind.h"
 #include "base/memory/ptr_util.h"
 #include "base/numerics/safe_math.h"
 #include "base/process/memory.h"
 #include "ui/gfx/buffer_format_util.h"
-#include "ui/gfx/gpu_memory_buffer_tracing.h"
 #include "ui/gl/gl_bindings.h"
 
 namespace gpu {
 
 GpuMemoryBufferImplSharedMemory::GpuMemoryBufferImplSharedMemory(
     gfx::GpuMemoryBufferId id,
     const gfx::Size& size,
     gfx::BufferFormat format,
     const DestructionCallback& callback,
     std::unique_ptr<base::SharedMemory> shared_memory,
@@ skipping 14 matching lines @@
                                         const gfx::Size& size,
                                         gfx::BufferFormat format,
                                         const DestructionCallback& callback) {
   size_t buffer_size = 0u;
   if (!gfx::BufferSizeForBufferFormatChecked(size, format, &buffer_size))
     return nullptr;
 
   std::unique_ptr<base::SharedMemory> shared_memory(new base::SharedMemory());
   if (!shared_memory->CreateAndMapAnonymous(buffer_size))
     return nullptr;
-
+  const int kImportance = 2;
+  shared_memory->set_importance(kImportance);
   return base::WrapUnique(new GpuMemoryBufferImplSharedMemory(
       id, size, format, callback, std::move(shared_memory), 0,
       gfx::RowSizeForBufferFormat(size.width(), format, 0)));
 }
 
 // static
 gfx::GpuMemoryBufferHandle
 GpuMemoryBufferImplSharedMemory::CreateGpuMemoryBuffer(
     gfx::GpuMemoryBufferId id,
     const gfx::Size& size,
@@ skipping 18 matching lines @@
 
 // static
 std::unique_ptr<GpuMemoryBufferImplSharedMemory>
 GpuMemoryBufferImplSharedMemory::CreateFromHandle(
     const gfx::GpuMemoryBufferHandle& handle,
     const gfx::Size& size,
     gfx::BufferFormat format,
     gfx::BufferUsage usage,
     const DestructionCallback& callback) {
   DCHECK(base::SharedMemory::IsHandleValid(handle.handle));
-
+  std::unique_ptr<base::SharedMemory> shared_memory =
+      base::MakeUnique<base::SharedMemory>(handle.handle, false);
+  const int kImportance = 2;
+  shared_memory->set_importance(kImportance);
   return base::WrapUnique(new GpuMemoryBufferImplSharedMemory(
-      handle.id, size, format, callback,
-      base::MakeUnique<base::SharedMemory>(handle.handle, false), handle.offset,
-      handle.stride));
+      handle.id, size, format, callback, std::move(shared_memory),
+      handle.offset, handle.stride));
 }
 
 // static
 bool GpuMemoryBufferImplSharedMemory::IsUsageSupported(gfx::BufferUsage usage) {
   switch (usage) {
     case gfx::BufferUsage::GPU_READ:
     case gfx::BufferUsage::GPU_READ_CPU_READ_WRITE:
     case gfx::BufferUsage::GPU_READ_CPU_READ_WRITE_PERSISTENT:
     case gfx::BufferUsage::SCANOUT_CPU_READ_WRITE:
       return true;
@@ skipping 104 matching lines @@
   handle.id = id_;
   handle.offset = offset_;
   handle.stride = stride_;
   handle.handle = shared_memory_->handle();
   return handle;
 }
 
 base::trace_event::MemoryAllocatorDumpGuid
 GpuMemoryBufferImplSharedMemory::GetGUIDForTracing(
     uint64_t tracing_process_id) const {
-  return gfx::GetSharedMemoryGUIDForTracing(tracing_process_id, id_);
+  return shared_memory_->handle().GetGUIDForTracing();
+}
+
+base::SharedMemory* GpuMemoryBufferImplSharedMemory::GetSharedMemory() {
+  return shared_memory_.get();
 }
 
 }  // namespace gpu