base: Discardable memory types.

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 <vector>
@@ skipping 388 matching lines @@
   base::FilePath media_path;
   PathService::Get(DIR_MEDIA_LIBS, &media_path);
   if (!media_path.empty())
     media::InitializeMediaLibrary(media_path);
 
   memory_pressure_listener_.reset(new base::MemoryPressureListener(
       base::Bind(&RenderThreadImpl::OnMemoryPressure, base::Unretained(this))));
 
   renderer_process_id_ = base::kNullProcessId;
 
+  std::vector<base::DiscardableMemoryType> supported_types;
+  base::DiscardableMemory::GetSupportedTypes(&supported_types);
+  DCHECK(!supported_types.empty());
+
+  // The default preferred type is always the first one in list.
+  base::DiscardableMemoryType type = supported_types[0];
+
+  if (command_line.HasSwitch(switches::kUseDiscardableMemory)) {
+    std::string requested_type_name = command_line.GetSwitchValueASCII(
+        switches::kUseDiscardableMemory);
+    base::DiscardableMemoryType requested_type =
+        base::DiscardableMemory::GetNamedType(requested_type_name);
+    if (std::find(supported_types.begin(),
+                  supported_types.end(),
+                  requested_type) != supported_types.end()) {
+      type = requested_type;
+    } else {
+      LOG(ERROR) << "Requested discardable memory type is not supported.";
+    }
+  }
+
+  base::DiscardableMemory::SetPreferredType(type);
+
   // AllocateGpuMemoryBuffer must be used exclusively on one thread but
   // it doesn't have to be the same thread RenderThreadImpl is created on.
   allocate_gpu_memory_buffer_thread_checker_.DetachFromThread();
 
   TRACE_EVENT_END_ETW("RenderThreadImpl::Init", 0, "");
 }
 
 RenderThreadImpl::~RenderThreadImpl() {
 }
 
@@ skipping 935 matching lines @@
   if (!gamepad_shared_memory_reader_)
     gamepad_shared_memory_reader_.reset(new GamepadSharedMemoryReader);
   gamepad_shared_memory_reader_->SampleGamepads(*data);
 }
 
 base::ProcessId RenderThreadImpl::renderer_process_id() const {
   return renderer_process_id_;
 }
 
 }  // namespace content