Add samples to Viewer.

tools/viewer/SampleSlide.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 "SampleSlide.h"
+
+#include "SkCanvas.h"
+#include "SkCommonFlags.h"
+#include "SkOSFile.h"
+#include "SkStream.h"
+
+SampleSlide::SampleSlide(const SkViewFactory* factory) : fViewFactory(factory) {
+    SkView* view = (*factory)();
+    SampleCode::RequestTitle(view, &fName);
+    view->unref();
+}
+
+SampleSlide::~SampleSlide() {}
+
+void SampleSlide::draw(SkCanvas* canvas) {
+    fView->draw(canvas);
+}
+
+void SampleSlide::load(SkScalar winWidth, SkScalar winHeight) {
+    fView = (*fViewFactory)();
+    fView->setVisibleP(true);
+    fView->setClipToBounds(false);
+    fView->setSize(winWidth, winHeight);
+}
+
+void SampleSlide::unload() {
+    fView->unref();
+    fView = nullptr;
+}
+
+#if defined(SK_BUILD_FOR_ANDROID)
+// these are normally defined in SkOSWindow_unix, but we don't
+// want to include that
+void SkEvent::SignalNonEmptyQueue() {}
+
+void SkEvent::SignalQueueTimer(SkMSec delay) {}
+#endif