Add initial GLImage tracing + stubs

content/child/child_gpu_memory_buffer_manager.cc

Index: content/child/child_gpu_memory_buffer_manager.cc
diff --git a/content/child/child_gpu_memory_buffer_manager.cc b/content/child/child_gpu_memory_buffer_manager.cc
index 9a7517d7b8d358bc235e59fe81da4e0764b26c06..1c7b67bcc5c6ce7a559869884432a6d1cd598fa6 100644
--- a/content/child/child_gpu_memory_buffer_manager.cc
+++ b/content/child/child_gpu_memory_buffer_manager.cc
@@ -5,6 +5,7 @@
 #include "content/child/child_gpu_memory_buffer_manager.h"
 
 #include "content/common/child_process_messages.h"
+#include "content/common/generic_shared_memory_id_generator.h"
 #include "content/common/gpu/client/gpu_memory_buffer_impl.h"
 
 namespace content {
@@ -41,7 +42,8 @@ ChildGpuMemoryBufferManager::AllocateGpuMemoryBuffer(const gfx::Size& size,
 
   gfx::GpuMemoryBufferHandle handle;
   IPC::Message* message = new ChildProcessHostMsg_SyncAllocateGpuMemoryBuffer(
-      size.width(), size.height(), format, usage, &handle);
+      content::GetNextGenericSharedMemoryId(), size.width(), size.height(),
+      format, usage, &handle);
   bool success = sender_->Send(message);
   if (!success || handle.is_null())
     return nullptr;