Move closeWindow()/setFullscreen()/setVSynv() from SkWindow to SkOSWindow

Rename setFullscreen to makeFullscreen, drop the param, return a bool.

Review URL: https://codereview.chromium.org/1181723006
diff --git a/tools/VisualBench.cpp b/tools/VisualBench.cpp
index 5cd1ebd..58b628a 100644
--- a/tools/VisualBench.cpp
+++ b/tools/VisualBench.cpp
@@ -101,7 +101,9 @@
     this->setVisibleP(true);
     this->setClipToBounds(false);
 
-    this->setFullscreen(true);
+    if (!this->makeFullscreen()) {
+        SkDebugf("Could not go fullscreen!");
+    }
     if (!this->attach(kNativeGL_BackEndType, FLAGS_msaa, &fAttachmentInfo)) {
         SkDebugf("Not possible to create backend.\n");
         INHERITED::detach();