Add 'P' to SampleApp to cycle through pixel geometries.

samplecode/SampleApp.h

Index: samplecode/SampleApp.h
diff --git a/samplecode/SampleApp.h b/samplecode/SampleApp.h
index 7ee07d86dd254ec5c96bfa249c2726231a1d24d8..31bfa5b74da056beb39bf02ff290641db7e770b9 100644
--- a/samplecode/SampleApp.h
+++ b/samplecode/SampleApp.h
@@ -124,6 +124,7 @@ public:
     void toggleFPS();
     void showOverview();
     void toggleDistanceFieldFonts();
+    void setPixelGeometry(int pixelGeometryIndex);
 
     GrContext* getGrContext() const { return fDevManager->getGrContext(); }
 
@@ -206,6 +207,7 @@ private:
     SkOSMenu::TriState fAAState;
     SkOSMenu::TriState fSubpixelState;
     int fHintingState;
+    int fPixelGeometryIndex;
     int fFilterQualityIndex;
     unsigned   fFlipAxis;