Add sw support to viewer on Linux.

tools/viewer/sk_app/unix/RasterWindowContext_unix.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 RasterWindowContext_android_DEFINED
 #define RasterWindowContext_android_DEFINED
 
-#include <android/native_window_jni.h>
 
 #include "../RasterWindowContext.h"
+#include <X11/Xlib.h>
 
 namespace sk_app {
 
-class RasterWindowContext_android : public RasterWindowContext {
+class RasterWindowContext_unix : public RasterWindowContext {
 public:
-    friend RasterWindowContext* RasterWindowContext::Create(
-            void* platformData, const DisplayParams&);
+    static RasterWindowContext* Create(Display*, ::Window, const DisplayParams&);

[jvanverth1, 2016/07/19 21:18:11]

If you include Window_unix.h, I typedef Window as XWindow, which might be a
little cleaner than ::Window.

[bsalomon, 2016/07/25 19:55:53]

Done.

 
     sk_sp<SkSurface> getBackbufferSurface() override;
     void swapBuffers() override;
 
-    bool isValid() override { return SkToBool(fNativeWindow); }
+    bool isValid() override { return SkToBool(fWindow); }
     void resize(uint32_t w, uint32_t h) override;
     void setDisplayParams(const DisplayParams& params) override;
 
 private:
-    RasterWindowContext_android(void* platformData, const DisplayParams& params);
-    void setBuffersGeometry();
+    RasterWindowContext_unix(Display*, ::Window, const DisplayParams&);
+
     sk_sp<SkSurface> fBackbufferSurface = nullptr;
-    ANativeWindow* fNativeWindow = nullptr;
-    ANativeWindow_Buffer fBuffer;
-    ARect fBounds;
+
+    Display* fDisplay;
+    ::Window fWindow;
+    GC       fGC;
 };
 
 }   // namespace sk_app
 
 #endif