force grcontext to be created at startup

git-svn-id: http://skia.googlecode.com/svn/trunk@1798 2bbb7eff-a529-9590-31e7-b0007b416f81

samplecode/SampleApp.cpp

@@ -437,6 +437,9 @@ SampleWindow::SampleWindow(void* hwnd, int argc, char** argv) : INHERITED(hwnd)
 #ifdef SK_BUILD_FOR_MAC
     testpdf();
 #endif
+
+    this->make3DReady();
+    this->detachGL();
 }
 
 SampleWindow::~SampleWindow() {