Infrastructure for temportarily relinquishing GPU resources.

content/browser/gpu/gpu_process_host_ui_shim.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/gpu/gpu_process_host_ui_shim.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
+#include "base/callback_helpers.h"
 #include "base/debug/trace_event.h"
 #include "base/id_map.h"
 #include "base/lazy_instance.h"
 #include "base/strings/string_number_conversions.h"
 #include "content/browser/gpu/compositor_util.h"
 #include "content/browser/gpu/gpu_data_manager_impl.h"
 #include "content/browser/gpu/gpu_process_host.h"
 #include "content/browser/gpu/gpu_surface_tracker.h"
 #include "content/browser/renderer_host/render_process_host_impl.h"
 #include "content/browser/renderer_host/render_view_host_impl.h"
@@ skipping 153 matching lines @@
           ->OnMessageReceived(message))
     return true;
 #endif
 
   if (message.routing_id() != MSG_ROUTING_CONTROL)
     return false;
 
   return OnControlMessageReceived(message);
 }
 
+void GpuProcessHostUIShim::RelinquishGpuResources(
+      const base::Closure& callback) {
+  DCHECK(relinquish_callback_.is_null());
+  relinquish_callback_ = callback;
+  Send(new GpuMsg_RelinquishResources());
+}
+
 void GpuProcessHostUIShim::SimulateRemoveAllContext() {
   Send(new GpuMsg_Clean());
 }
 
 void GpuProcessHostUIShim::SimulateCrash() {
   Send(new GpuMsg_Crash());
 }
 
 void GpuProcessHostUIShim::SimulateHang() {
   Send(new GpuMsg_Hang());
@@ skipping 12 matching lines @@
     IPC_MESSAGE_HANDLER(GpuHostMsg_OnLogMessage,
                         OnLogMessage)
     IPC_MESSAGE_HANDLER(GpuHostMsg_AcceleratedSurfaceInitialized,
                         OnAcceleratedSurfaceInitialized)
     IPC_MESSAGE_HANDLER(GpuHostMsg_AcceleratedSurfaceBuffersSwapped,
                         OnAcceleratedSurfaceBuffersSwapped)
     IPC_MESSAGE_HANDLER(GpuHostMsg_GraphicsInfoCollected,
                         OnGraphicsInfoCollected)
     IPC_MESSAGE_HANDLER(GpuHostMsg_VideoMemoryUsageStats,
                         OnVideoMemoryUsageStatsReceived);
+    IPC_MESSAGE_HANDLER(GpuHostMsg_ResourcesRelinquished,
+                        OnResourcesRelinquished)
 
     IPC_MESSAGE_UNHANDLED_ERROR()
   IPC_END_MESSAGE_MAP()
 
   return true;
 }
 
 void GpuProcessHostUIShim::OnLogMessage(
     int level,
     const std::string& header,
@@ skipping 50 matching lines @@
   NOTREACHED();
 #endif
 }
 
 void GpuProcessHostUIShim::OnVideoMemoryUsageStatsReceived(
     const GPUVideoMemoryUsageStats& video_memory_usage_stats) {
   GpuDataManagerImpl::GetInstance()->UpdateVideoMemoryUsageStats(
       video_memory_usage_stats);
 }
 
+void GpuProcessHostUIShim::OnResourcesRelinquished() {
+  if (!relinquish_callback_.is_null()) {
+    base::ResetAndReturn(&relinquish_callback_).Run();
+  }
+}
+
 }  // namespace content