exo: Recreate Surface resources on context lost.

content/browser/compositor/image_transport_factory.h

Index: content/browser/compositor/image_transport_factory.h
diff --git a/content/browser/compositor/image_transport_factory.h b/content/browser/compositor/image_transport_factory.h
index 984d652884725f6216695f99d73ec2668c53bfba..376e240877549b7e3077e6f27cb472437c618879 100644
--- a/content/browser/compositor/image_transport_factory.h
+++ b/content/browser/compositor/image_transport_factory.h
@@ -28,6 +28,7 @@ enum class SwapResult;
 namespace ui {
 class Compositor;
 class ContextFactory;
+class ContextFactoryObserver;
 class Texture;
 }
 
@@ -37,20 +38,6 @@ class GLHelper;
 
 namespace content {
 
-// This class provides a way to get notified when surface handles get lost.
-class CONTENT_EXPORT ImageTransportFactoryObserver {
- public:
-  virtual ~ImageTransportFactoryObserver() {}
-
-  // Notifies that the surface handles generated by ImageTransportFactory were
-  // lost.
-  // When this is called, the old resources (e.g. shared context, GL helper)
-  // still exist, but are about to be destroyed. Getting a reference to those
-  // resources from the ImageTransportFactory (e.g. through GetGLHelper) will
-  // return newly recreated, valid resources.
-  virtual void OnLostResources() = 0;
-};
-
 // This class provides the interface for creating the support for the
 // cross-process image transport, both for creating the shared surface handle
 // (destination surface for the GPU process) and the transport client (logic for
@@ -83,9 +70,6 @@ class CONTENT_EXPORT ImageTransportFactory {
   // (ImageTransportFactoryObserver::OnLostResources is called).
   virtual display_compositor::GLHelper* GetGLHelper() = 0;
 
-  virtual void AddObserver(ImageTransportFactoryObserver* observer) = 0;
-  virtual void RemoveObserver(ImageTransportFactoryObserver* observer) = 0;
-
 #if defined(OS_MACOSX)
   // Called with |suspended| as true when the ui::Compositor has been
   // disconnected from an NSView and may be attached to another one. Called