Add delegate and factory function for ChildMemoryCoordinator

content/renderer/render_thread_impl.cc

Index: content/renderer/render_thread_impl.cc
diff --git a/content/renderer/render_thread_impl.cc b/content/renderer/render_thread_impl.cc
index 38cb251b3d7a7e93b83c01d0ba36643ce2d1c1d9..796e9b92a6c76ec2feb6c6595998f6a2006bee5c 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -821,9 +821,8 @@ void RenderThreadImpl::Init(
     // https://codereview.chromium.org/2094583002/#msg52
     memory_coordinator::mojom::MemoryCoordinatorHandlePtr parent_coordinator;
     GetRemoteInterfaces()->GetInterface(mojo::GetProxy(&parent_coordinator));
-    memory_coordinator_.reset(
-        new memory_coordinator::ChildMemoryCoordinatorImpl(
-            std::move(parent_coordinator)));
+    memory_coordinator_ = memory_coordinator::CreateChildMemoryCoordinator(
+        std::move(parent_coordinator), this);
   }
 
   int num_raster_threads = 0;
@@ -2216,4 +2215,16 @@ void RenderThreadImpl::OnSyncMemoryPressure(
       v8_memory_pressure_level);
 }
 
+// Note that this would be called only when memory_coordinator is enabled.
+// OnSyncMemoryPressure() is never called in that case.
+void RenderThreadImpl::OnTrimMemoryImmediately() {
+  if (blink::mainThreadIsolate()) {
+    blink::mainThreadIsolate()->MemoryPressureNotification(
+        v8::MemoryPressureLevel::kCritical);
+    blink::MemoryPressureNotificationToWorkerThreadIsolates(
+        v8::MemoryPressureLevel::kCritical);
+  }
+}
+
+
 }  // namespace content