MC: WIP: dispatching notifications from browser to renderer

chrome/browser/memory/tab_manager.cc

Index: chrome/browser/memory/tab_manager.cc
diff --git a/chrome/browser/memory/tab_manager.cc b/chrome/browser/memory/tab_manager.cc
index 6fa39ad66f4abcae4e9a2b8fd9c2677945db888f..05c1825ee3f7523998eed4ee608bd1c38e651215 100644
--- a/chrome/browser/memory/tab_manager.cc
+++ b/chrome/browser/memory/tab_manager.cc
@@ -45,6 +45,7 @@
 #include "chrome/common/chrome_features.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/url_constants.h"
+#include "components/memory_coordinator/browser/memory_coordinator.h"
 #include "components/metrics/system_memory_stats_recorder.h"
 #include "components/variations/variations_associated_data.h"
 #include "content/public/browser/browser_thread.h"
@@ -132,6 +133,14 @@ void NotifyRendererProcess(
       render_process_host, level);
 }
 
+void NotifyRendererUsingMemoryCoordinator(
+    const content::RenderProcessHost* render_process_host,
+    base::MemoryPressureListener::MemoryPressureLevel level) {
+  auto* coordinator = memory_coordinator::MemoryCoordinator::GetInstance();
+  DCHECK(coordinator);
+  coordinator->DispatchToRenderer(render_process_host->GetID(), level);
+}
+
 }  // namespace
 
 ////////////////////////////////////////////////////////////////////////////////
@@ -155,6 +164,14 @@ TabManager::TabManager()
   // testing seams.
   get_current_pressure_level_ = base::Bind(&GetCurrentPressureLevel);
   notify_renderer_process_ = base::Bind(&NotifyRendererProcess);
+  if (memory_coordinator::IsEnabled()) {
+    auto* coordinator = memory_coordinator::MemoryCoordinator::GetInstance();
+    DCHECK(coordinator);
+    coordinator->SetChildrenDispatchCallback(
+        base::Bind(&TabManager::OnMemoryPressure, base::Unretained(this)));
+    notify_renderer_process_ =
+        base::Bind(&NotifyRendererUsingMemoryCoordinator);
+  }
 }
 
 TabManager::~TabManager() {