More refactoring for Viewer

tools/viewer/android/main_android.cpp

-/*
-* Copyright 2016 Google Inc.
-*
-* Use of this source code is governed by a BSD-style license that can be
-* found in the LICENSE file.
-*/
-
-#include <jni.h>
-#include <errno.h>
-
-#include <android_native_app_glue.h>
-
-#include "../Application.h"
-#include "Timer.h"
-
-static double now_ms() { return SkTime::GetNSecs() * 1e-6; }
-
-using sk_app::Application;
-
-/**
- * This is the main entry point of a native application that is using
- * android_native_app_glue.  It runs in its own thread, with its own
- * event loop for receiving input events and doing other things.
- */
-void android_main(struct android_app* state) {
-    // Make sure glue isn't stripped.
-    app_dummy();
-
-    static const char* gCmdLine[] = {
-        "viewer",
-        "--skps",
-        "/data/local/tmp/skp",
-    };
-
-    std::unique_ptr<Application> vkApp(Application::Create(SK_ARRAY_COUNT(gCmdLine),
-                                                           const_cast<char**>(gCmdLine),
-                                                           state));
-
-    double currentTime = 0.0;
-    double previousTime = 0.0;
-
-    // loop waiting for stuff to do.
-    while (1) {
-        // Read all pending events.
-        int ident;
-        int events;
-        struct android_poll_source* source;
-
-        // block forever waiting for events.
-        while ((ident=ALooper_pollAll(-1, NULL, &events,
-                (void**)&source)) >= 0) {
-
-            // Process this event.
-            if (source != NULL) {
-                source->process(state, source);
-            }
-
-            // Check if we are exiting.
-            if (state->destroyRequested != 0) {
-                return;
-            }
-
-            previousTime = currentTime;
-            currentTime = now_ms();
-            vkApp->onIdle(currentTime - previousTime);
-        }
-    }
-}
-//END_INCLUDE(all)