Re-land: base: Implement browser process support for discardable memory.

content/browser/browser_main_loop.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/browser/browser_main_loop.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 23 matching lines @@
 #include "content/browser/loader/resource_dispatcher_host_impl.h"
 #include "content/browser/media/media_internals.h"
 #include "content/browser/net/browser_online_state_observer.h"
 #include "content/browser/renderer_host/media/media_stream_manager.h"
 #include "content/browser/speech/speech_recognition_manager_impl.h"
 #include "content/browser/startup_task_runner.h"
 #include "content/browser/time_zone_monitor.h"
 #include "content/browser/webui/content_web_ui_controller_factory.h"
 #include "content/browser/webui/url_data_manager.h"
 #include "content/common/content_switches_internal.h"
+#include "content/common/host_discardable_shared_memory_manager.h"
 #include "content/public/browser/browser_main_parts.h"
 #include "content/public/browser/browser_shutdown.h"
 #include "content/public/browser/content_browser_client.h"
 #include "content/public/browser/render_process_host.h"
 #include "content/public/browser/tracing_controller.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/common/main_function_params.h"
 #include "content/public/common/result_codes.h"
 #include "crypto/nss_util.h"
 #include "device/battery/battery_status_service.h"
@@ skipping 399 matching lines @@
   if (parsed_command_line_.HasSwitch(switches::kEnableNativeGpuMemoryBuffers)) {
     BrowserGpuChannelHostFactory::EnableGpuMemoryBufferFactoryUsage(
         gfx::GpuMemoryBuffer::MAP);
   }
 
 #if defined(USE_OZONE)
   BrowserGpuChannelHostFactory::EnableGpuMemoryBufferFactoryUsage(
       gfx::GpuMemoryBuffer::SCANOUT);
 #endif
 
+  base::DiscardableMemoryShmemAllocator::SetInstance(
+      HostDiscardableSharedMemoryManager::current());
+
   if (parts_)
     parts_->PostEarlyInitialization();
 }
 
 void BrowserMainLoop::MainMessageLoopStart() {
   TRACE_EVENT0("startup", "BrowserMainLoop::MainMessageLoopStart");
   if (parts_) {
     TRACE_EVENT0("startup",
         "BrowserMainLoop::MainMessageLoopStart:PreMainMessageLoopStart");
     parts_->PreMainMessageLoopStart();
@@ skipping 797 matching lines @@
 
 void BrowserMainLoop::EndStartupTracing() {
   is_tracing_startup_ = false;
   TracingController::GetInstance()->DisableRecording(
       TracingController::CreateFileSink(
           startup_trace_file_,
           base::Bind(OnStoppedStartupTracing, startup_trace_file_)));
 }
 
 }  // namespace content