memory-infra: Finish moving to Mojo (2nd attempt)

components/tracing/child/child_trace_message_filter.cc

Index: components/tracing/child/child_trace_message_filter.cc
diff --git a/components/tracing/child/child_trace_message_filter.cc b/components/tracing/child/child_trace_message_filter.cc
index ed2be875c7da066e73b97ee3e044e14f61b5c68d..6012a96a8f4291afecf2278757e9c16cde8d9ec2 100644
--- a/components/tracing/child/child_trace_message_filter.cc
+++ b/components/tracing/child/child_trace_message_filter.cc
@@ -8,11 +8,13 @@
 
 #include "base/memory/ref_counted_memory.h"
 #include "base/metrics/statistics_recorder.h"
+#include "base/trace_event/memory_dump_manager.h"
 #include "base/trace_event/trace_event.h"
-#include "components/tracing/child/child_memory_dump_manager_delegate_impl.h"
+#include "components/tracing/common/process_metrics_memory_dump_provider.h"
 #include "components/tracing/common/tracing_messages.h"
 #include "ipc/ipc_channel.h"
 
+using base::trace_event::MemoryDumpManager;
 using base::trace_event::TraceLog;
 
 namespace tracing {
@@ -25,16 +27,18 @@ const int kMinTimeBetweenHistogramChangesInSeconds = 10;
 
 ChildTraceMessageFilter::ChildTraceMessageFilter(
     base::SingleThreadTaskRunner* ipc_task_runner)
-    : sender_(NULL),
-      ipc_task_runner_(ipc_task_runner),
-      pending_memory_dump_guid_(0) {
-}
+    : sender_(NULL), ipc_task_runner_(ipc_task_runner) {}
 
 void ChildTraceMessageFilter::OnFilterAdded(IPC::Channel* channel) {
   sender_ = channel;
   sender_->Send(new TracingHostMsg_ChildSupportsTracing());
-  ChildMemoryDumpManagerDelegateImpl::GetInstance()->SetChildTraceMessageFilter(
-      this);
+
+#if !defined(OS_LINUX) && !defined(OS_NACL)
+  // On linux the browser process takes care of dumping process metrics.
+  // The child process is not allowed to do so due to BPF sandbox.
+  tracing::ProcessMetricsMemoryDumpProvider::RegisterForProcess(
+      base::kNullProcessId);
+#endif
 }
 
 void ChildTraceMessageFilter::SetSenderForTesting(IPC::Sender* sender) {
@@ -42,8 +46,6 @@ void ChildTraceMessageFilter::SetSenderForTesting(IPC::Sender* sender) {
 }
 
 void ChildTraceMessageFilter::OnFilterRemoved() {
-  ChildMemoryDumpManagerDelegateImpl::GetInstance()->SetChildTraceMessageFilter(
-      nullptr);
   sender_ = NULL;
 }
 
@@ -54,10 +56,6 @@ bool ChildTraceMessageFilter::OnMessageReceived(const IPC::Message& message) {
     IPC_MESSAGE_HANDLER(TracingMsg_EndTracing, OnEndTracing)
     IPC_MESSAGE_HANDLER(TracingMsg_CancelTracing, OnCancelTracing)
     IPC_MESSAGE_HANDLER(TracingMsg_GetTraceLogStatus, OnGetTraceLogStatus)
-    IPC_MESSAGE_HANDLER(TracingMsg_ProcessMemoryDumpRequest,
-                        OnProcessMemoryDumpRequest)
-    IPC_MESSAGE_HANDLER(TracingMsg_GlobalMemoryDumpResponse,
-                        OnGlobalMemoryDumpResponse)
     IPC_MESSAGE_HANDLER(TracingMsg_SetUMACallback, OnSetUMACallback)
     IPC_MESSAGE_HANDLER(TracingMsg_ClearUMACallback, OnClearUMACallback)
     IPC_MESSAGE_UNHANDLED(handled = false)
@@ -78,8 +76,7 @@ void ChildTraceMessageFilter::OnBeginTracing(
   base::TimeDelta time_offset = base::TimeTicks::Now() - browser_time;
   TraceLog::GetInstance()->SetTimeOffset(time_offset);
 #endif
-  ChildMemoryDumpManagerDelegateImpl::GetInstance()->set_tracing_process_id(
-      tracing_process_id);
+  MemoryDumpManager::GetInstance()->set_tracing_process_id(tracing_process_id);
   TraceLog::GetInstance()->SetEnabled(
       base::trace_event::TraceConfig(trace_config_str),
       base::trace_event::TraceLog::RECORDING_MODE);
@@ -95,8 +92,8 @@ void ChildTraceMessageFilter::OnEndTracing() {
   TraceLog::GetInstance()->Flush(
       base::Bind(&ChildTraceMessageFilter::OnTraceDataCollected, this));
 
-  ChildMemoryDumpManagerDelegateImpl::GetInstance()->set_tracing_process_id(
-      base::trace_event::MemoryDumpManager::kInvalidTracingProcessId);
+  MemoryDumpManager::GetInstance()->set_tracing_process_id(
+      MemoryDumpManager::kInvalidTracingProcessId);
 }
 
 void ChildTraceMessageFilter::OnCancelTracing() {
@@ -129,52 +126,6 @@ void ChildTraceMessageFilter::OnTraceDataCollected(
   }
 }
 
-// Sent by the Browser's MemoryDumpManager when coordinating a global dump.
-void ChildTraceMessageFilter::OnProcessMemoryDumpRequest(
-    const base::trace_event::MemoryDumpRequestArgs& args) {
-  ChildMemoryDumpManagerDelegateImpl::GetInstance()->CreateProcessDump(
-      args,
-      base::Bind(&ChildTraceMessageFilter::OnProcessMemoryDumpDone, this));
-}
-
-void ChildTraceMessageFilter::OnProcessMemoryDumpDone(uint64_t dump_guid,
-                                                      bool success) {
-  sender_->Send(
-      new TracingHostMsg_ProcessMemoryDumpResponse(dump_guid, success));
-}
-
-// Initiates a dump request, asking the Browser's MemoryDumpManager to
-// coordinate a global memory dump. The Browser's MDM will answer back with a
-// MemoryDumpResponse when all the child processes (including this one) have
-// dumped, or with a NACK (|success| == false) if the dump failed (e.g., due to
-// a collision with a concurrent request from another child process).
-void ChildTraceMessageFilter::SendGlobalMemoryDumpRequest(
-    const base::trace_event::MemoryDumpRequestArgs& args,
-    const base::trace_event::MemoryDumpCallback& callback) {
-  // If there is already another dump request pending from this child process,
-  // there is no point bothering the Browser's MemoryDumpManager.
-  if (pending_memory_dump_guid_) {
-    if (!callback.is_null())
-      callback.Run(args.dump_guid, false);
-    return;
-  }
-
-  pending_memory_dump_guid_ = args.dump_guid;
-  pending_memory_dump_callback_ = callback;
-  sender_->Send(new TracingHostMsg_GlobalMemoryDumpRequest(args));
-}
-
-// Sent by the Browser's MemoryDumpManager in response of a dump request
-// initiated by this child process.
-void ChildTraceMessageFilter::OnGlobalMemoryDumpResponse(uint64_t dump_guid,
-                                                         bool success) {
-  DCHECK_NE(0U, pending_memory_dump_guid_);
-  pending_memory_dump_guid_ = 0;
-  if (pending_memory_dump_callback_.is_null())
-    return;
-  pending_memory_dump_callback_.Run(dump_guid, success);
-}
-
 void ChildTraceMessageFilter::OnHistogramChanged(
     const std::string& histogram_name,
     base::Histogram::Sample reference_lower_value,