Infrastructure for temportarily relinquishing GPU resources.

content/common/gpu/gpu_channel_manager.cc

Index: content/common/gpu/gpu_channel_manager.cc
diff --git a/content/common/gpu/gpu_channel_manager.cc b/content/common/gpu/gpu_channel_manager.cc
index a073e20151edce4dc033a6d9e54bf3c0196b214a..951db9a3eac7f37bd1a12e1f2c153e45d84d132a 100644
--- a/content/common/gpu/gpu_channel_manager.cc
+++ b/content/common/gpu/gpu_channel_manager.cc
@@ -103,10 +103,7 @@ GpuChannelManager::GpuChannelManager(MessageRouter* router,
 
 GpuChannelManager::~GpuChannelManager() {
   gpu_channels_.clear();
-  if (default_offscreen_surface_.get()) {
-    default_offscreen_surface_->Destroy();
-    default_offscreen_surface_ = NULL;
-  }
+  OnDeleteDefaultOffscreenSurface();

[jbauman, 2014/11/12 01:47:28]

This shouldn't be necessary, as it'll be deleted automatically.

[GusFernandez, 2014/11/15 02:11:56]

See below.

 }
 
 gpu::gles2::ProgramCache* GpuChannelManager::program_cache() {
@@ -162,6 +159,8 @@ bool GpuChannelManager::OnMessageReceived(const IPC::Message& msg) {
                         OnCreateViewCommandBuffer)
     IPC_MESSAGE_HANDLER(GpuMsg_DestroyGpuMemoryBuffer, OnDestroyGpuMemoryBuffer)
     IPC_MESSAGE_HANDLER(GpuMsg_LoadedShader, OnLoadedShader)
+    IPC_MESSAGE_HANDLER(GpuMsg_DeleteDefaultOffscreenSurface,
+                        OnDeleteDefaultOffscreenSurface)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
@@ -323,4 +322,11 @@ gfx::GLSurface* GpuChannelManager::GetDefaultOffscreenSurface() {
   return default_offscreen_surface_.get();
 }
 
+void GpuChannelManager::OnDeleteDefaultOffscreenSurface() {
+    if (default_offscreen_surface_.get()) {
+      default_offscreen_surface_->Destroy();

[jbauman, 2014/11/12 01:47:28]

This Destroy should be unnecessary, as it'll be called in the destructor.

[GusFernandez, 2014/11/15 02:11:56]

The whole point is to release the default_offscreen_surface temporarily without
having to tear down the whole GPU channel.

+      default_offscreen_surface_ = NULL;
+  }
+}
+
 }  // namespace content