More refactoring for Viewer

tools/viewer/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>
-
-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);
-    void initDisplay(ANativeWindow* window);
-
-    void setTitle(const char*) override;
-    void show() override {}
-
-    bool attach(BackEndType attachType, int msaaSampleCount) 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); }
-
-private:
-    android_app* mApp = nullptr;
-    SkRect mContentRect;
-    int mSampleCount = 0;
-};
-
-}   // namespace sk_app
-
-#endif