Infrastructure for temportarily relinquishing GPU resources.

content/common/gpu/gpu_messages.h

 // 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.
 
 // Multiply-included message file, hence no include guard here, but see below
 // for a much smaller-than-usual include guard section.
 
 #include <string>
 #include <vector>
 
@@ skipping 283 matching lines @@
 
 // Tells the GPU process to hang.
 IPC_MESSAGE_CONTROL0(GpuMsg_Hang)
 
 // Tells the GPU process to disable the watchdog thread.
 IPC_MESSAGE_CONTROL0(GpuMsg_DisableWatchdog)
 
 // Tells the GPU process that the browser has seen a GPU switch.
 IPC_MESSAGE_CONTROL0(GpuMsg_GpuSwitched)
 
+// Tells the GPU process to delete the default_offscreen surface. It will also
+// close the display and any other resources when the last GL surface is
+// deleted. GPU process will respond with GphHosMsg_ResourcesRelinquished.
+IPC_MESSAGE_CONTROL0(GpuMsg_RelinquishResources)
+
 //------------------------------------------------------------------------------
 // GPU Host Messages
 // These are messages to the browser.
 
 // A renderer sends this when it wants to create a connection to the GPU
 // process. The browser will create the GPU process if necessary, and will
 // return a handle to the channel via a GpuChannelEstablished message.
 IPC_SYNC_MESSAGE_CONTROL1_3(GpuHostMsg_EstablishGpuChannel,
                             content::CauseForGpuLaunch,
                             int /* client id */,
@@ skipping 81 matching lines @@
                      gpu::error::ContextLostReason /* reason */,
                      GURL /* url */)
 
 IPC_MESSAGE_CONTROL1(GpuHostMsg_DidDestroyOffscreenContext,
                      GURL /* url */)
 
 // Tells the browser about GPU memory usage statistics for UMA logging.
 IPC_MESSAGE_CONTROL1(GpuHostMsg_GpuMemoryUmaStats,
                      content::GPUMemoryUmaStats /* GPU memory UMA stats */)
 
+// Response to GpuMsg_RelinquishResources.
+IPC_MESSAGE_CONTROL0(GpuHostMsg_ResourcesRelinquished)
+
 //------------------------------------------------------------------------------
 // GPU Channel Messages
 // These are messages from a renderer process to the GPU process.
 
 // Tells the GPU process to create a new command buffer that renders to an
 // offscreen frame buffer.
 IPC_SYNC_MESSAGE_CONTROL3_1(GpuChannelMsg_CreateOffscreenCommandBuffer,
                             gfx::Size, /* size */
                             GPUCreateCommandBufferConfig, /* init_params */
                             int32, /* route_id */
@@ skipping 307 matching lines @@
                     int32 /* bitstream_buffer_id */,
                     uint32 /* payload_size */,
                     bool /* key_frame */)
 
 // Report error condition.
 IPC_MESSAGE_ROUTED1(AcceleratedVideoEncoderHostMsg_NotifyError,
                     media::VideoEncodeAccelerator::Error /* error */)
 
 // Send destroy request to the encoder.
 IPC_MESSAGE_ROUTED0(AcceleratedVideoEncoderMsg_Destroy)