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

include/views/SkOSWindow_Android.h

Index: include/views/SkOSWindow_Android.h
diff --git a/include/views/SkOSWindow_Android.h b/include/views/SkOSWindow_Android.h
index 2538a3ea8e7f6d392a9ac4b1bc4a53d924d096ac..09163fc1cb9824fcf83c02272a3444c748754ee1 100644
--- a/include/views/SkOSWindow_Android.h
+++ b/include/views/SkOSWindow_Android.h
@@ -31,8 +31,9 @@ public:
     bool attach(SkBackEndTypes attachType, int msaaSampleCount, AttachmentInfo* info);
     void detach();
     void present();
-    void closeWindow() override;
-    void setVsync(bool) override;
+    bool makeFullscreen() { return true; }
+    void closeWindow();
+    void setVsync(bool);
     bool destroyRequested() { return fDestroyRequested; }
 
     virtual void onPDFSaved(const char title[], const char desc[], const char path[]);