Support resize in Android Viewer App

tools/viewer/sk_app/android/GLWindowContext_android.h

Index: tools/viewer/sk_app/android/GLWindowContext_android.h
diff --git a/tools/viewer/sk_app/android/GLWindowContext_android.h b/tools/viewer/sk_app/android/GLWindowContext_android.h
index 85e65beaa251b451cb41ab3d98d0cc33f178496c..fbfa19da8812ad313515cbb08beba7bd0feb32f0 100644
--- a/tools/viewer/sk_app/android/GLWindowContext_android.h
+++ b/tools/viewer/sk_app/android/GLWindowContext_android.h
@@ -8,6 +8,8 @@
 #ifndef GLWindowContext_android_DEFINED
 #define GLWindowContext_android_DEFINED
 
+#include <android/native_window_jni.h>

[djsollen, 2016/06/09 18:34:21]

don't need this here.  Just before the namespace line put

struct ANativeWindow;

+
 #include "../GLWindowContext.h"
 #include "Window_android.h"
 
@@ -32,6 +34,9 @@ private:
     EGLDisplay fDisplay;
     EGLContext fEGLContext;
     EGLSurface fSurface;
+
+    // For setDisplayParams and resize which call onInitializeContext with null platformData
+    ANativeWindow* fNativeWindow = nullptr;
 };