Add GenericSharedMemoryId and use w/ GpuMemoryBuffer

content/common/gpu/client/gpu_memory_buffer_impl_shared_memory.cc

Index: content/common/gpu/client/gpu_memory_buffer_impl_shared_memory.cc
diff --git a/content/common/gpu/client/gpu_memory_buffer_impl_shared_memory.cc b/content/common/gpu/client/gpu_memory_buffer_impl_shared_memory.cc
index 9db36962d20ed24423a55646490399a8aef00764..3b8cafe3c5bd55708d87d4a510c40dae5cdab163 100644
--- a/content/common/gpu/client/gpu_memory_buffer_impl_shared_memory.cc
+++ b/content/common/gpu/client/gpu_memory_buffer_impl_shared_memory.cc
@@ -163,6 +163,28 @@ bool GpuMemoryBufferImplSharedMemory::IsSizeValidForFormat(
   return false;
 }
 
+// static
+void GpuMemoryBufferImplSharedMemory::DumpGenericSharedMemory(
+    base::trace_event::ProcessMemoryDump* pmd,
+    uint64_t client_tracing_process_id,
+    gfx::GpuMemoryBufferId id) {
+  // Establish the link between a GpuMemoryBufferId and any
+  // GenericSharedMemoryId.
+  base::trace_event::MemoryAllocatorDumpGuid gpu_memory_buffer_guid =
+      gfx::GetGpuMemoryBufferGUIDForTracing(client_tracing_process_id, id);
+  base::trace_event::MemoryAllocatorDumpGuid generic_shared_memory_guid =
+      base::GetGenericSharedMemoryGUIDForTracing(client_tracing_process_id, id);
+  pmd->CreateSharedGlobalAllocatorDump(generic_shared_memory_guid);
+
+  // The link from the shared memory guid to the gpu memory buffer guid is
+  // higher than the link from the shared memory guid to the various low
+  // level memory dumps. This ensures that memory is tracked on the gpu
+  // memory buffer.
+  const int kImportance = 2;
+  pmd->AddOwnershipEdge(gpu_memory_buffer_guid, generic_shared_memory_guid,
+                        kImportance);

[reveman, 2015/08/06 19:19:36]

I think the edge and the gpu_memory_buffer_guid should be created by browser GMB
manager.

[ericrk, 2015/08/06 22:05:19]

Acknowledged.

+}
+
 bool GpuMemoryBufferImplSharedMemory::Map(void** data) {
   DCHECK(!mapped_);
   size_t offset = 0;