Initial commit of our new Android app to demo Skia.

tools/viewer/sk_app/android/Window_android.h

 /*
 * Copyright 2016 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
 
 #ifndef Window_android_DEFINED
 #define Window_android_DEFINED
 
 #include "../Window.h"
-#include <android_native_app_glue.h>
+#include "surface_glue_android.h"
 
 namespace sk_app {
 
-enum {
-    /**
-     * Leave plenty of space between this item and the ones defined in the glue layer
-     */
-    APP_CMD_INVAL_WINDOW = 64,
-};
-
 class Window_android : public Window {
 public:
     Window_android() : Window() {}
     ~Window_android() override {}
 
-    bool init(android_app* app_state);
+    bool init(SkiaAndroidApp* skiaAndroidApp);
     void initDisplay(ANativeWindow* window);
+    void onDisplayDestroyed();
 
     void setTitle(const char*) override;
     void show() override {}
 
     bool attach(BackEndType attachType, const DisplayParams& params) override;
     void inval() override;
 
-    void paintIfNeeded();
-
     bool scaleContentToFit() const override { return true; }
     bool supportsContentRect() const override { return true; }
-    SkRect getContentRect() override { return mContentRect; }
-    void setContentRect(int l, int t, int r, int b) { mContentRect.set(l,t,r,b); }
+    SkRect getContentRect() override { return fContentRect; }
+    void setContentRect(int l, int t, int r, int b) { fContentRect.set(l,t,r,b); }
 
 private:
-    android_app* mApp = nullptr;
-    SkRect mContentRect;
+    SkiaAndroidApp* fSkiaAndroidApp = nullptr;
+    SkRect fContentRect;
     DisplayParams fDisplayParams;
+    bool fNativeWindowInitialized = false;
 };
 
 }   // namespace sk_app
 
 #endif