[Experiment] purge-and-suspend

cc/tiles/gpu_image_decode_controller.cc

 // Copyright 2016 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 "cc/tiles/gpu_image_decode_controller.h"
 
 #include <inttypes.h>
 
+#include "base/allocator/allocator_extension.h"
 #include "base/memory/discardable_memory_allocator.h"
 #include "base/memory/ptr_util.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/numerics/safe_math.h"
 #include "base/strings/stringprintf.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "cc/debug/devtools_instrumentation.h"
 #include "cc/output/context_provider.h"
 #include "cc/raster/tile_task.h"
 #include "cc/resources/resource_format_utils.h"
@@ skipping 332 matching lines @@
         context->GrContext()->threadSafeProxy());
   }
 
   // In certain cases, ThreadTaskRunnerHandle isn't set (Android Webview).
   // Don't register a dump provider in these cases.
   if (base::ThreadTaskRunnerHandle::IsSet()) {
     base::trace_event::MemoryDumpManager::GetInstance()->RegisterDumpProvider(
         this, "cc::GpuImageDecodeController",
         base::ThreadTaskRunnerHandle::Get());
   }
+  memory_pressure_listener_.reset(new base::MemoryPressureListener(base::Bind(
+      &GpuImageDecodeController::OnMemoryPressure, base::Unretained(this))));
 }
 
 GpuImageDecodeController::~GpuImageDecodeController() {
   // SetShouldAggressivelyFreeResources will zero our limits and free all
   // outstanding image memory.
   SetShouldAggressivelyFreeResources(true);
 
   // It is safe to unregister, even if we didn't register in the constructor.
   base::trace_event::MemoryDumpManager::GetInstance()->UnregisterDumpProvider(
       this);
@@ skipping 215 matching lines @@
       // as the owner in memory traces.
       const int kImportance = 3;
       pmd->CreateSharedGlobalAllocatorDump(guid);
       pmd->AddOwnershipEdge(dump->guid(), guid, kImportance);
     }
   }
 
   return true;
 }
 
+void GpuImageDecodeController::OnMemoryPressure(
+    base::MemoryPressureListener::MemoryPressureLevel memory_pressure_level) {
+  SetShouldAggressivelyFreeResources(true);
+  base::allocator::ReleaseFreeMemory();
+}
+
 void GpuImageDecodeController::DecodeImage(const DrawImage& draw_image) {
   base::AutoLock lock(lock_);
   ImageData* image_data = GetImageDataForDrawImage(draw_image);
   DCHECK(image_data);
   DCHECK(!image_data->is_at_raster);
   DecodeImageIfNecessary(draw_image, image_data);
 }
 
 void GpuImageDecodeController::UploadImage(const DrawImage& draw_image) {
   ContextProvider::ScopedContextLock context_lock(context_);
@@ skipping 522 matching lines @@
 bool GpuImageDecodeController::DiscardableIsLockedForTesting(
     const DrawImage& image) {
   base::AutoLock lock(lock_);
   auto found = persistent_cache_.Peek(image.image()->uniqueID());
   DCHECK(found != persistent_cache_.end());
   ImageData* image_data = found->second.get();
   return image_data->decode.is_locked();
 }
 
 }  // namespace cc