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..50760b6e3617af8c666b22e782a2a9a4c3131b43 100644
--- a/content/common/gpu/gpu_channel_manager.cc
+++ b/content/common/gpu/gpu_channel_manager.cc
@@ -20,6 +20,10 @@
 #include "ipc/message_filter.h"
 #include "ui/gl/gl_bindings.h"
 #include "ui/gl/gl_share_group.h"
+#if defined(USE_OZONE)
+#include "ui/ozone/public/gpu_platform_support.h"
+#include "ui/ozone/public/ozone_platform.h"
+#endif
 
 namespace content {
 
@@ -162,6 +166,7 @@ bool GpuChannelManager::OnMessageReceived(const IPC::Message& msg) {
                         OnCreateViewCommandBuffer)
     IPC_MESSAGE_HANDLER(GpuMsg_DestroyGpuMemoryBuffer, OnDestroyGpuMemoryBuffer)
     IPC_MESSAGE_HANDLER(GpuMsg_LoadedShader, OnLoadedShader)
+    IPC_MESSAGE_HANDLER(GpuMsg_RelinquishResources, OnRelinquishResources)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
@@ -323,4 +328,22 @@ gfx::GLSurface* GpuChannelManager::GetDefaultOffscreenSurface() {
   return default_offscreen_surface_.get();
 }
 
+void GpuChannelManager::OnRelinquishResources() {
+  if (default_offscreen_surface_.get()) {
+    default_offscreen_surface_->Destroy();
+    default_offscreen_surface_ = NULL;
+  }
+#if defined(USE_OZONE)
+  ui::OzonePlatform::GetInstance()->GetGpuPlatformSupport()->
+      RelinquishGpuResources(base::Bind(
+         &GpuChannelManager::OnResourcesReliuquished, base::Unretained(this)));

[piman, 2014/11/20 21:06:43]

Is Unretained safe?
If it is, can you document why?

[GusFernandez, 2014/11/20 21:42:48]

Used the safer weak_factory_.GetWeakPtr() instead.

+#else
+  OnResourcesReliuquished();

[piman, 2014/11/20 21:06:43]

typo: Reliuquished -> Relinquished

[GusFernandez, 2014/11/20 21:42:48]

Done.

+#endif
+}
+
+void GpuChannelManager::OnResourcesReliuquished() {
+  Send(new GpuHostMsg_ResourcesRelinquished());
+}
+
 }  // namespace content