Minor fixes for SampleApp.

- Add a comment for invalidating in onSizeChange.
- Call base constructor for SkOSWindow_Unix.
- Call onSizeChange in SampleWindow constructor so fZoomCenter gets set.


git-svn-id: http://skia.googlecode.com/svn/trunk@1627 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/utils/unix/SkOSWindow_Unix.cpp b/src/utils/unix/SkOSWindow_Unix.cpp
index 2e4ae88..a752166 100644
--- a/src/utils/unix/SkOSWindow_Unix.cpp
+++ b/src/utils/unix/SkOSWindow_Unix.cpp
@@ -25,7 +25,7 @@
 const long EVENT_MASK = StructureNotifyMask|ButtonPressMask|ButtonReleaseMask
         |ExposureMask|PointerMotionMask|KeyPressMask|KeyReleaseMask;
 
-SkOSWindow::SkOSWindow(void* unused) : fGLAttached(false), fVi(0)
+SkOSWindow::SkOSWindow(void* unused) : INHERITED(), fGLAttached(false), fVi(0)
 {
     fUnixWindow.fDisplay = XOpenDisplay(NULL);
     Display* dsp = fUnixWindow.fDisplay;