[tracing] Introduce MemoryDumpArgs to enable light and heavy dumps

content/common/host_discardable_shared_memory_manager.h

 // 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.
 
 #ifndef CONTENT_COMMON_HOST_DISCARDABLE_SHARED_MEMORY_MANAGER_H_
 #define CONTENT_COMMON_HOST_DISCARDABLE_SHARED_MEMORY_MANAGER_H_
 
 #include <vector>
 
 #include "base/containers/hash_tables.h"
@@ skipping 23 matching lines @@
   ~HostDiscardableSharedMemoryManager() override;
 
   // Returns a singleton instance.
   static HostDiscardableSharedMemoryManager* current();
 
   // Overridden from base::DiscardableMemoryAllocator:
   scoped_ptr<base::DiscardableMemory> AllocateLockedDiscardableMemory(
       size_t size) override;
 
   // Overridden from base::trace_event::MemoryDumpProvider:
-  bool OnMemoryDump(base::trace_event::ProcessMemoryDump* pmd) override;
+  bool OnMemoryDump(const base::trace_event::MemoryDumpArgs& args,
+                    base::trace_event::ProcessMemoryDump* pmd) override;
 
   // This allocates a discardable memory segment for |process_handle|.
   // A valid shared memory handle is returned on success.
   void AllocateLockedDiscardableSharedMemoryForChild(
       base::ProcessHandle process_handle,
       int child_process_id,
       size_t size,
       DiscardableSharedMemoryId id,
       base::SharedMemoryHandle* shared_memory_handle);
 
@@ skipping 73 matching lines @@
   scoped_ptr<base::MemoryPressureListener> memory_pressure_listener_;
   bool enforce_memory_policy_pending_;
   base::WeakPtrFactory<HostDiscardableSharedMemoryManager> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(HostDiscardableSharedMemoryManager);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_HOST_DISCARDABLE_SHARED_MEMORY_MANAGER_H_