Update the native_viewport interface to allow specification of the surface...

Update the native_viewport interface to allow specification of the surface configuration, currently only needed for and used by EGL on Android.

This also fixes an issue where eglChooseConfig was
only being called in InitializeOneOff, which is
only called once per process.  This CL makes
choosing the config happen once per GLSurface
instead, which will ultimately permit apps to
create multiple native_viewports with different
surface configurations on the same display.  The
eglDisplay object is still a global, though.

R=abarth@chromium.org, viettrungluu@chromium.org, jamesr@chromium.org

Review URL: https://codereview.chromium.org/1168993002.

shell/gpu/rasterizer.cc

@@ -37,7 +37,8 @@ base::WeakPtr<Rasterizer> Rasterizer::GetWeakPtr() {
 }
 
 void Rasterizer::OnAcceleratedWidgetAvailable(gfx::AcceleratedWidget widget) {
-  surface_ = gfx::GLSurface::CreateViewGLSurface(widget);
+  surface_ = gfx::GLSurface::CreateViewGLSurface(widget,
+                                                 gfx::SurfaceConfiguration());
   CHECK(surface_) << "GLSurface required.";
 }