Add ownership edges between HostSharedBitmap and shared memory

base/memory/shared_memory_tracker.h

Index: base/memory/shared_memory_tracker.h
diff --git a/base/memory/shared_memory_tracker.h b/base/memory/shared_memory_tracker.h
index fe1a3dd392177b0c20bb5b2daf6498d85eae7e0b..2a97ba854af5e2cd4beff96be068076a2c86c8c8 100644
--- a/base/memory/shared_memory_tracker.h
+++ b/base/memory/shared_memory_tracker.h
@@ -12,6 +12,7 @@
 namespace base {
 
 namespace trace_event {
+class MemoryAllocatorDumpGuid;
 class ProcessMemoryDump;
 }
 
@@ -22,6 +23,22 @@ class BASE_EXPORT SharedMemoryTracker
   // Returns a singleton instance.
   static SharedMemoryTracker* GetInstance();
 
+  // Adds two ownership edges between 1) the given guid |source| and 2) a
+  // process-local dump for the shared memory of |shared_memory_handle|, and
+  // between 2) and 3) a global shared memory dump. This helps to get accurate
+  // effective size of modules that backend is shared memory.
+  static bool AddOwnershipEdges(
+      trace_event::ProcessMemoryDump* pmd,
+      const trace_event::MemoryAllocatorDumpGuid& source,
+      const SharedMemoryHandle& shared_memory_handle,
+      size_t size);
+  static bool AddOwnershipEdges(
+      trace_event::ProcessMemoryDump* pmd,
+      const trace_event::MemoryAllocatorDumpGuid& source,
+      const SharedMemoryHandle& shared_memory_handle,
+      size_t size,
+      int importance);
+
   // Records shared memory usage on mapping.
   void IncrementMemoryUsage(const SharedMemory& shared_memory);
 
@@ -41,8 +58,8 @@ class BASE_EXPORT SharedMemoryTracker
   ~SharedMemoryTracker() override;
 
   // base::trace_event::MemoryDumpProvider implementation.
-  bool OnMemoryDump(const base::trace_event::MemoryDumpArgs& args,
-                    base::trace_event::ProcessMemoryDump* pmd) override;
+  bool OnMemoryDump(const trace_event::MemoryDumpArgs& args,
+                    trace_event::ProcessMemoryDump* pmd) override;
 
   // Used to lock when |usages_| is modified or read.
   Lock usages_lock_;