memory coordinator: Add MemoryCoordinatorClient::OnPurgeMemory()

content/browser/renderer_host/renderer_frame_manager.cc

 // Copyright 2013 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/renderer_host/renderer_frame_manager.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/logging.h"
@@ skipping 149 matching lines @@
       break;
     case base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_CRITICAL:
       PurgeMemory(kCriticalPressurePercentage);
       break;
     case base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_NONE:
       // No need to change anything when there is no pressure.
       return;
   }
 }
 
-void RendererFrameManager::OnMemoryStateChange(base::MemoryState state) {
-  switch (state) {
-    case base::MemoryState::NORMAL:
-      // It is not necessary to purge here.
-      break;
-    case base::MemoryState::THROTTLED:
-      PurgeMemory(kCriticalPressurePercentage);
-      break;
-    case base::MemoryState::SUSPENDED:
-      // Note that SUSPENDED never occurs in the main browser process so far.
-      // Fall through.
-    case base::MemoryState::UNKNOWN:
-      NOTREACHED();
-      break;
-  }
+void RendererFrameManager::OnPurgeMemory() {
+  PurgeMemory(kCriticalPressurePercentage);
 }
 
 void RendererFrameManager::PurgeMemory(int percentage) {
   int saved_frame_limit = max_number_of_saved_frames_;
   if (saved_frame_limit <= 1)
     return;
   CullUnlockedFrames(std::max(1, (saved_frame_limit * percentage) / 100));
 }
 
 }  // namespace content