[tracing] Introduce MemoryDumpArgs to enable light and heavy dumps

content/browser/gpu/browser_gpu_memory_buffer_manager.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 "content/browser/gpu/browser_gpu_memory_buffer_manager.h"
 
 #include "base/atomic_sequence_num.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/strings/stringprintf.h"
@@ skipping 243 matching lines @@
 }
 
 void BrowserGpuMemoryBufferManager::SetDestructionSyncPoint(
     gfx::GpuMemoryBuffer* buffer,
     uint32 sync_point) {
   static_cast<GpuMemoryBufferImpl*>(buffer)
       ->set_destruction_sync_point(sync_point);
 }
 
 bool BrowserGpuMemoryBufferManager::OnMemoryDump(
+    const base::trace_event::MemoryDumpArgs& args,
     base::trace_event::ProcessMemoryDump* pmd) {
+  // TODO(ssid): Use MemoryDumpArgs to create light dumps when requested
+  // (crbug.com/499731).
+
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 
   for (const auto& client : clients_) {
     int client_id = client.first;
 
     for (const auto& buffer : client.second) {
       if (buffer.second.type == gfx::EMPTY_BUFFER)
         continue;
 
       gfx::GpuMemoryBufferId buffer_id = buffer.first;
@@ skipping 310 matching lines @@
   }
 
   GpuProcessHost* host = GpuProcessHost::FromID(buffer_it->second.gpu_host_id);
   if (host)
     host->DestroyGpuMemoryBuffer(id, client_id, sync_point);
 
   buffers.erase(buffer_it);
 }
 
 }  // namespace content