Reland: Add MemoryCoordinator

content/browser/browser_main_loop.cc

Index: content/browser/browser_main_loop.cc
diff --git a/content/browser/browser_main_loop.cc b/content/browser/browser_main_loop.cc
index 2368fbdec1e671590a1c3e95c80e566ff2787fab..dd8a09059975f011ec3ed883e9e461d46979d552 100644
--- a/content/browser/browser_main_loop.cc
+++ b/content/browser/browser_main_loop.cc
@@ -36,6 +36,8 @@
 #include "base/trace_event/memory_dump_manager.h"
 #include "base/trace_event/trace_event.h"
 #include "build/build_config.h"
+#include "components/memory_coordinator/browser/memory_coordinator.h"
+#include "components/memory_coordinator/common/memory_coordinator_features.h"
 #include "components/tracing/browser/trace_config_file.h"
 #include "components/tracing/common/process_metrics_memory_dump_provider.h"
 #include "components/tracing/common/trace_to_console.h"
@@ -721,6 +723,10 @@ int BrowserMainLoop::PreCreateThreads() {
       parsed_command_line_));
 #endif
 
+  if (memory_coordinator::IsEnabled()) {
+    memory_coordinator_.reset(new memory_coordinator::MemoryCoordinator);
+  }
+
 #if defined(ENABLE_PLUGINS)
   // Prior to any processing happening on the IO thread, we create the
   // plugin service as it is predominantly used from the IO thread,
@@ -997,6 +1003,7 @@ void BrowserMainLoop::ShutdownThreadsAndCleanUp() {
   }
 
   memory_pressure_monitor_.reset();
+  memory_coordinator_.reset();
 
 #if defined(OS_MACOSX)
   BrowserCompositorMac::DisableRecyclingForShutdown();