Android: Use virtualized context only for those with compatible config

ui/gl/gl_surface.cc

Index: ui/gl/gl_surface.cc
diff --git a/ui/gl/gl_surface.cc b/ui/gl/gl_surface.cc
index 2fccf8783179654eceec09112831715299684f3e..da0831528b79c30fb0341153cd79d7edb3103b54 100644
--- a/ui/gl/gl_surface.cc
+++ b/ui/gl/gl_surface.cc
@@ -190,9 +190,9 @@ void* GLSurface::GetConfig() {
   return NULL;
 }
 
-unsigned GLSurface::GetFormat() {
+GLSurface::Format GLSurface::GetFormat() {
   NOTIMPLEMENTED();
-  return 0;
+  return SURFACE_DEFAULT;
 }
 
 VSyncProvider* GLSurface::GetVSyncProvider() {
@@ -373,7 +373,7 @@ void* GLSurfaceAdapter::GetConfig() {
   return surface_->GetConfig();
 }
 
-unsigned GLSurfaceAdapter::GetFormat() {
+GLSurface::Format GLSurfaceAdapter::GetFormat() {
   return surface_->GetFormat();
 }