MemoryPressure: sends the signal to the renderer.

content/app/android/child_process_service.cc

Index: content/app/android/child_process_service.cc
diff --git a/content/app/android/child_process_service.cc b/content/app/android/child_process_service.cc
index b06b0b4d6d80f2903032f10b9979a860abf67985..e2250048de2d9054eda0caa007e8701a82069425 100644
--- a/content/app/android/child_process_service.cc
+++ b/content/app/android/child_process_service.cc
@@ -8,6 +8,7 @@
 #include <cpu-features.h>
 
 #include "base/android/jni_array.h"
+#include "base/android/memory_pressure_listener_android.h"
 #include "base/logging.h"
 #include "base/posix/global_descriptors.h"
 #include "content/child/child_process.h"
@@ -102,6 +103,7 @@ void InternalInitChildProcess(const std::vector<int>& file_ids,
   content::SurfaceTexturePeer::InitInstance(
       new SurfaceTexturePeerChildImpl(service));
 
+  base::android::MemoryPressureListenerAndroid::RegisterSystemCallback(env);
 }
 
 void QuitMainThreadMessageLoop() {