Add ability to query and allocate zero copy buffers.

ui/ozone/public/surface_factory_ozone.h

Index: ui/ozone/public/surface_factory_ozone.h
diff --git a/ui/ozone/public/surface_factory_ozone.h b/ui/ozone/public/surface_factory_ozone.h
index 62df13e50740423de6567804d69e4c010eb5c40f..d130de0575e2bcf9bb06a3fc173572ab949fdf4a 100644
--- a/ui/ozone/public/surface_factory_ozone.h
+++ b/ui/ozone/public/surface_factory_ozone.h
@@ -68,6 +68,11 @@ class OZONE_BASE_EXPORT SurfaceFactoryOzone {
     RGB_888,
   };
 
+  enum BufferUsage {
+    MAP,

[spang, 2014/11/07 17:42:06]

do we ever want both (MAP | SCANOUT)?

+    SCANOUT,
+  };
+
   typedef void* (*GLGetProcAddressProc)(const char* name);
   typedef base::Callback<void(base::NativeLibrary)> AddGLLibraryCallback;
   typedef base::Callback<void(GLGetProcAddressProc)>
@@ -121,10 +126,10 @@ class OZONE_BASE_EXPORT SurfaceFactoryOzone {
   virtual OverlayCandidatesOzone* GetOverlayCandidates(
       gfx::AcceleratedWidget w);
 
-  // Cleate a single native buffer to be used for overlay planes.
-  virtual scoped_refptr<NativePixmap> CreateNativePixmap(
-      gfx::Size size,
-      BufferFormat format);
+  // Cleate a single native buffer to be used for overlay planes or zero copy.
+  virtual scoped_refptr<NativePixmap> CreateNativePixmap(gfx::Size size,
+                                                         BufferFormat format,
+                                                         BufferUsage usage);
 
   // Sets the overlay plane to switch to at the next page flip.
   // |w| specifies the screen to display this overlay plane on.
@@ -149,6 +154,10 @@ class OZONE_BASE_EXPORT SurfaceFactoryOzone {
   // overlay-only mode.
   virtual bool CanShowPrimaryPlaneAsOverlay();
 
+  // Returns true if the platform is able to create buffers for a specific usage
+  // such as MAP for zero copy or SCANOUT for display controller.
+  virtual bool CanCreateNativePixmap(BufferUsage usage);
+
  private:
   static SurfaceFactoryOzone* impl_;  // not owned
 };