Add architecture for simulating memory pressure notifications in all processes

content/browser/memory/memory_pressure_controller.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/memory/memory_pressure_controller.h"
 
 #include "base/bind.h"
-#include "base/memory/memory_pressure_listener.h"
 #include "content/browser/memory/memory_message_filter.h"
 #include "content/public/browser/browser_thread.h"
 
 namespace content {
 
 MemoryPressureController::MemoryPressureController() {}
 
 MemoryPressureController::~MemoryPressureController() {}
 
 void MemoryPressureController::OnMemoryMessageFilterAdded(
@@ skipping 25 matching lines @@
 MemoryPressureController* MemoryPressureController::GetInstance() {
   return base::Singleton<
       MemoryPressureController,
       base::LeakySingletonTraits<MemoryPressureController>>::get();
 }
 
 void MemoryPressureController::SetPressureNotificationsSuppressedInAllProcesses(
     bool suppressed) {
   if (!BrowserThread::CurrentlyOn(BrowserThread::IO)) {
     // Note that passing base::Unretained(this) is safe here because the
-    // controller is a leaky singleton (i.e. it is never deleted).
+    // controller is a leaky singleton.
     BrowserThread::PostTask(
         BrowserThread::IO, FROM_HERE,
         base::Bind(&MemoryPressureController::
                        SetPressureNotificationsSuppressedInAllProcesses,
                    base::Unretained(this), suppressed));
     return;
   }
 
   // Enable/disable suppressing memory notifications in the browser process.
   base::MemoryPressureListener::SetNotificationsSuppressed(suppressed);
 
   // Enable/disable suppressing memory notifications in all child processes.
-  for (MemoryMessageFilterSet::iterator it = memory_message_filters_.begin();
-       it != memory_message_filters_.end(); ++it) {
-    it->get()->SendSetPressureNotificationsSuppressed(suppressed);
+  for (const scoped_refptr<MemoryMessageFilter>& mf : memory_message_filters_)

[nasko, 2015/09/30 16:44:58]

nit: s/mf/filter/

[petrcermak, 2015/09/30 18:18:36]

Done.

+    mf->SendSetPressureNotificationsSuppressed(suppressed);
+}
+
+void MemoryPressureController::SimulatePressureNotificationInAllProcesses(
+    base::MemoryPressureListener::MemoryPressureLevel level) {
+  DCHECK_NE(level, base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_NONE);
+
+  if (!BrowserThread::CurrentlyOn(BrowserThread::IO)) {
+    // Note that passing base::Unretained(this) is safe here because the
+    // controller is a leaky singleton.
+    BrowserThread::PostTask(
+        BrowserThread::IO, FROM_HERE,
+        base::Bind(&MemoryPressureController::
+                       SimulatePressureNotificationInAllProcesses,
+                   base::Unretained(this), level));
+    return;
   }
+
+  // Simulate memory pressure notification in the browser process.
+  base::MemoryPressureListener::SimulatePressureNotification(level);
+
+  // Simulate memory pressure notification in all child processes.
+  for (const scoped_refptr<MemoryMessageFilter>& mf : memory_message_filters_)

[nasko, 2015/09/30 16:44:58]

nit: s/mf/filter/

[petrcermak, 2015/09/30 18:18:36]

Done.

+    mf->SendSimulatePressureNotification(level);
 }
 
 }  // namespace content