Add a new API to create a surfaceless GLSurface for Ozone

content/common/gpu/image_transport_surface_linux.cc

Index: content/common/gpu/image_transport_surface_linux.cc
diff --git a/content/common/gpu/image_transport_surface_linux.cc b/content/common/gpu/image_transport_surface_linux.cc
index b648b197c5c525225c50bf2193605b134b3a22ed..3e1686ee543fe62903e6ee3f4c4c5e913c2e58ee 100644
--- a/content/common/gpu/image_transport_surface_linux.cc
+++ b/content/common/gpu/image_transport_surface_linux.cc
@@ -13,8 +13,12 @@ scoped_refptr<gfx::GLSurface> ImageTransportSurface::CreateNativeSurface(
     const gfx::GLSurfaceHandle& handle) {
   DCHECK(handle.handle);
   DCHECK(handle.transport_type == gfx::NATIVE_DIRECT);
-  scoped_refptr<gfx::GLSurface> surface =
-      gfx::GLSurface::CreateViewGLSurface(handle.handle);
+  scoped_refptr<gfx::GLSurface> surface;
+#if USE_OZONE

[spang, 2015/02/19 00:42:04]

Don't you need to take the flag into account? Not all platforms can do
surfaceless. Forcing it is not an option.

[achaulk, 2015/02/19 00:43:07]

That's done inside ozone, if we don't support due to options it this will fail
and we fall back

[spang, 2015/02/19 00:49:26]

Ok, so this is "maybe create surfaceless, but I can accept a regular surface".

Probably warrants a comment in the header in that case.

Anyway, it should say #if defined(USE_OZONE) to match the usual style.

+  surface = gfx::GLSurface::CreateSurfacelessViewGLSurface(handle.handle);
+#endif
+  if (!surface.get())
+    surface = gfx::GLSurface::CreateViewGLSurface(handle.handle);
   if (!surface.get())
     return surface;
   return scoped_refptr<gfx::GLSurface>(new PassThroughImageTransportSurface(