ozone: Clarify All SurfaceFactoryOzone APIs except for CreateNativePixmap() must be used on the mai…

ui/ozone/platform/caca/caca_window_manager.cc

Index: ui/ozone/platform/caca/caca_window_manager.cc
diff --git a/ui/ozone/platform/caca/caca_window_manager.cc b/ui/ozone/platform/caca/caca_window_manager.cc
index 3e11ad29bed543d5f9ee12520bf303fbe137785f..2b5a5d224c56ce422031f8dc925f2f3ed4c68962 100644
--- a/ui/ozone/platform/caca/caca_window_manager.cc
+++ b/ui/ozone/platform/caca/caca_window_manager.cc
@@ -118,16 +118,19 @@ void CacaWindowManager::RemoveWindow(int window_id, CacaWindow* window) {
 }
 
 CacaWindowManager::~CacaWindowManager() {
+  DCHECK(thread_checker_.CalledOnValidThread());
 }
 
 bool CacaWindowManager::LoadEGLGLES2Bindings(
     AddGLLibraryCallback add_gl_library,
     SetGLGetProcAddressProcCallback set_gl_get_proc_address) {
+  DCHECK(thread_checker_.CalledOnValidThread());
   return false;
 }
 
 scoped_ptr<ui::SurfaceOzoneCanvas> CacaWindowManager::CreateCanvasForWidget(
     gfx::AcceleratedWidget widget) {
+  DCHECK(thread_checker_.CalledOnValidThread());
   CacaWindow* window = windows_.Lookup(widget);
   DCHECK(window);