Add a public interface for content::MemoryCoordinator

content/browser/memory/memory_coordinator_impl.cc

 // Copyright 2016 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.
 
 #include "content/browser/memory/memory_coordinator_impl.h"
 
 #include "base/memory/memory_coordinator_client_registry.h"
 #include "base/memory/ptr_util.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/process/process_handle.h"
@@ skipping 136 matching lines @@
 // as an actual instance.
 struct MemoryCoordinatorImplSingletonTraits
     : public base::LeakySingletonTraits<MemoryCoordinatorImpl> {
   static MemoryCoordinatorImpl* New() {
     return new MemoryCoordinatorImpl(base::ThreadTaskRunnerHandle::Get(),
                                      CreateMemoryMonitor());
   }
 };
 
 // static
+MemoryCoordinator* MemoryCoordinator::GetInstance() {
+  return MemoryCoordinatorImpl::GetInstance();
+}
+
+// static
 MemoryCoordinatorImpl* MemoryCoordinatorImpl::GetInstance() {
   if (!base::FeatureList::IsEnabled(features::kMemoryCoordinator))
     return nullptr;
   return base::Singleton<MemoryCoordinatorImpl,
                          MemoryCoordinatorImplSingletonTraits>::get();
 }
 
 MemoryCoordinatorImpl::MemoryCoordinatorImpl(
     scoped_refptr<base::SingleThreadTaskRunner> task_runner,
     std::unique_ptr<MemoryMonitor> memory_monitor)
@@ skipping 123 matching lines @@
   if (!process)
     return;
   auto iter = children().find(process->GetID());
   if (iter == children().end())
     return;
   iter->second.is_visible = *Details<bool>(details).ptr();
   auto new_state = GetGlobalMemoryState();
   SetChildMemoryState(iter->first, new_state);
 }
 
+base::MemoryState MemoryCoordinatorImpl::GetStateForProcess(
+    base::ProcessHandle handle) {
+  DCHECK(CalledOnValidThread());
+  if (handle == base::kNullProcessHandle)
+    return MemoryState::UNKNOWN;
+  if (handle == base::GetCurrentProcessHandle())
+    return GetCurrentMemoryState();
+
+  for (auto& iter : children()) {
+    auto* render_process_host = GetRenderProcessHost(iter.first);
+    if (render_process_host && render_process_host->GetHandle() == handle)
+      return iter.second.memory_state;
+  }
+  return MemoryState::UNKNOWN;
+}
+
 bool MemoryCoordinatorImpl::ChangeStateIfNeeded(base::MemoryState prev_state,
                                                 base::MemoryState next_state) {
   DCHECK(CalledOnValidThread());
   if (prev_state == next_state)
     return false;
 
   base::TimeTicks prev_last_state_change = last_state_change_;
   last_state_change_ = base::TimeTicks::Now();
   current_state_ = next_state;
 
@@ skipping 124 matching lines @@
 
 MemoryCoordinatorImpl::ChildInfo::ChildInfo() {}
 
 MemoryCoordinatorImpl::ChildInfo::ChildInfo(const ChildInfo& rhs) {
   // This is a nop, but exists for compatibility with STL containers.
 }
 
 MemoryCoordinatorImpl::ChildInfo::~ChildInfo() {}
 
 }  // namespace content