Reland: Add MemoryCoordinator

content/browser/browser_main_loop.h

Index: content/browser/browser_main_loop.h
diff --git a/content/browser/browser_main_loop.h b/content/browser/browser_main_loop.h
index 62ba7ac9e030c8d1a27665a72a270d5da7186438..d05d176e7c3f2a0505ec7f60aec07453c3b8b78e 100644
--- a/content/browser/browser_main_loop.h
+++ b/content/browser/browser_main_loop.h
@@ -50,6 +50,10 @@ class MidiManager;
 }  // namespace midi
 }  // namespace media
 
+namespace memory_coordinator {
+class MemoryCoordinator;
+}  // namespace memory_coordinator
+
 namespace mojo {
 namespace edk {
 class ScopedIPCSupport;
@@ -143,6 +147,10 @@ class CONTENT_EXPORT BrowserMainLoop {
 
   void StopStartupTracingTimer();
 
+  memory_coordinator::MemoryCoordinator* memory_coordinator() const {
+    return memory_coordinator_.get();
+  }
+
 #if defined(OS_MACOSX) && !defined(OS_IOS)
   media::DeviceMonitorMac* device_monitor_mac() const {
     return device_monitor_mac_.get();
@@ -249,6 +257,7 @@ class CONTENT_EXPORT BrowserMainLoop {
   // Members initialized in |PreCreateThreads()| -------------------------------
   // Torn down in ShutdownThreadsAndCleanUp.
   std::unique_ptr<base::MemoryPressureMonitor> memory_pressure_monitor_;
+  std::unique_ptr<memory_coordinator::MemoryCoordinator> memory_coordinator_;
 
   // Members initialized in |CreateThreads()| ----------------------------------
   std::unique_ptr<BrowserProcessSubThread> db_thread_;