Implement OnPurgeMemory callback for RenderThreadImpl

content/renderer/render_thread_impl.cc

 // Copyright (c) 2012 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/renderer/render_thread_impl.h"
 
 #include <algorithm>
 #include <limits>
 #include <map>
 #include <utility>
@@ skipping 2200 matching lines @@
         static_cast<blink::WebMemoryPressureLevel>(memory_pressure_level));
   }
   if (memory_pressure_level ==
       base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_CRITICAL) {
     ReleaseFreeMemory();
     ClearMemory();
   }
 }
 
 void RenderThreadImpl::OnMemoryStateChange(base::MemoryState state) {
-  // TODO(hajimehoshi): Adjust the size of this memory usage according to
-  // |state|. RenderThreadImpl doesn't have a feature to limit memory usage at
-  // present.
   if (blink_platform_impl_) {
     blink::WebMemoryCoordinator::onMemoryStateChange(
         static_cast<blink::MemoryState>(state));
   }
-  switch (state) {
-    case base::MemoryState::NORMAL:
-      break;
-    case base::MemoryState::THROTTLED:
-      // TODO(bashi): Figure out what kind of strategy is suitable on
-      // THROTTLED state. crbug.com/674815
-#if defined(OS_ANDROID)
-      OnTrimMemoryImmediately();
-#else
-      OnSyncMemoryPressure(
-          base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_MODERATE);
-#endif
-      ReleaseFreeMemory();
-      break;
-    case base::MemoryState::SUSPENDED:
-      OnTrimMemoryImmediately();
-      ReleaseFreeMemory();
-      ClearMemory();
-      break;
-    case base::MemoryState::UNKNOWN:
-      NOTREACHED();
-      break;
-  }
+}
+
+void RenderThreadImpl::OnPurgeMemory() {
+  OnTrimMemoryImmediately();
+  ReleaseFreeMemory();
+  ClearMemory();
+  if (blink_platform_impl_)
+    blink::WebMemoryCoordinator::onPurgeMemory();
 }
 
 void RenderThreadImpl::ClearMemory() {
   // Do not call into blink if it is not initialized.
   if (blink_platform_impl_) {
     // Purge Skia font cache, by setting it to 0 and then again to the
     // previous limit.
     size_t font_cache_limit = SkGraphics::SetFontCacheLimit(0);
     SkGraphics::SetFontCacheLimit(font_cache_limit);
   }
@@ skipping 179 matching lines @@
   }
 }
 
 void RenderThreadImpl::OnRendererInterfaceRequest(
     mojom::RendererAssociatedRequest request) {
   DCHECK(!renderer_binding_.is_bound());
   renderer_binding_.Bind(std::move(request));
 }
 
 }  // namespace content