Initial commit of our new Android app to demo Skia.

tools/viewer/sk_app/android/Window_android.cpp

Index: tools/viewer/sk_app/android/Window_android.cpp
diff --git a/tools/viewer/sk_app/android/Window_android.cpp b/tools/viewer/sk_app/android/Window_android.cpp
index 94be02c9336acc1493834c06918dad40ada2bfa7..b565375ac14ef4c5f4dd4e36bd0e751fd3f87b76 100644
--- a/tools/viewer/sk_app/android/Window_android.cpp
+++ b/tools/viewer/sk_app/android/Window_android.cpp
@@ -13,7 +13,7 @@ namespace sk_app {
 
 Window* Window::CreateNativeWindow(void* platformData) {
     Window_android* window = new Window_android();
-    if (!window->init((android_app*)platformData)) {
+    if (!window->init((AppThread*)platformData)) {
         delete window;
         return nullptr;
     }
@@ -23,6 +23,13 @@ Window* Window::CreateNativeWindow(void* platformData) {
 static void handle_cmd(struct android_app* app, int32_t cmd);
 static int32_t handle_input(struct android_app* app, AInputEvent* event);
 
+bool Window_android::init(AppThread* appThread) {
+    SkASSERT(appThread);
+    mAppThread = appThread;
+    mAppThread->window = this;
+    return true;
+}
+
 bool Window_android::init(android_app* app) {
     SkASSERT(app);
     mApp = app;
@@ -54,6 +61,7 @@ void Window_android::initDisplay(ANativeWindow* window) {
     ContextPlatformData_android platformData;
     platformData.fNativeWindow = window;
     fWindowContext = VulkanWindowContext::Create((void*)&platformData, mSampleCount);
+    nativeWindowInitialized = true;
 }
 
 static void android_app_write_cmd(struct android_app* android_app, int8_t cmd) {
@@ -63,11 +71,15 @@ static void android_app_write_cmd(struct android_app* android_app, int8_t cmd) {
 }
 
 void Window_android::inval() {
-    android_app_write_cmd(mApp, APP_CMD_INVAL_WINDOW);
+    if (mApp) {
+        android_app_write_cmd(mApp, APP_CMD_INVAL_WINDOW);
+    } else {
+        paintIfNeeded();
+    }
 }
 
 void Window_android::paintIfNeeded() {
-    if (mApp->window || !mContentRect.isEmpty()) {
+    if ((mApp && (mApp->window || !mContentRect.isEmpty())) || nativeWindowInitialized) {
         this->onPaint();
     }
 }