Compile all fiddle examples locally

Motivation: it would be a good idea if the API documentation examples
were checked into the skia repository, so we could make sure they
compile as part of the commit queue.

Fiddle would make/update a named fiddle each time it gets a new
commit of Skia, extracted from the code in the examples/ directory.
The docs would point at those named fiddles.  Named fiddles have urls
in the form:

    https://fiddle.skia.org/c/@Bitmap_000

Then we would stick a link to the example into the header documentation
like this:

    /** Allocates the pixel memory for the bitmap, given its dimensions
        and SkColorType. Returns true on success, where success means
        either setPixels() or setPixelRef() was called.

        @param bitmap  SkBitmap containing SkImageInfo as input, and
                       SkPixelRef as output
        @return        true if SkPixelRef was allocated

        @example       https://fiddle.skia.org/c/@Bitmap_000
    */
    bool allocPixelRef(SkBitmap* bitmap) override;

There are still around 200 disabled examples that need to be fixed
(these result from API changes since the author left).

Change-Id: I14a31348a9ccaaa31f65424b91e3a3533d2583a7
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/198824
Commit-Queue: Hal Canary <halcanary@google.com>
Reviewed-by: Leon Scroggins <scroggo@google.com>
Reviewed-by: Joe Gregorio <jcgregorio@google.com>
diff --git a/docs/examples/Picture_009.cpp b/docs/examples/Picture_009.cpp
new file mode 100644
index 0000000..22f931f
--- /dev/null
+++ b/docs/examples/Picture_009.cpp
@@ -0,0 +1,28 @@
+// Copyright 2019 Google LLC.
+// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
+#include "fiddle/examples.h"
+// HASH=0d2cbf82f490ffb180e0b4531afa232c
+REG_FIDDLE(Picture_009, 256, 256, false, 0) {
+class MyCanvas : public SkCanvas {
+public:
+    MyCanvas(SkCanvas* c) : canvas(c) {}
+        void onDrawPicture(const SkPicture* picture, const SkMatrix* ,
+                               const SkPaint* ) override {
+        const SkRect rect = picture->cullRect();
+        SkPaint redPaint;
+        redPaint.setColor(SK_ColorRED);
+        canvas->drawRect(rect, redPaint);
+   }
+   SkCanvas* canvas;
+};
+
+void draw(SkCanvas* canvas) {
+    SkPictureRecorder recorder;
+    SkCanvas* pictureCanvas = recorder.beginRecording({0, 0, 256, 256});
+    sk_sp<SkPicture> placeholder = SkPicture::MakePlaceholder({10, 40, 80, 110});
+    pictureCanvas->drawPicture(placeholder);
+    sk_sp<SkPicture> picture = recorder.finishRecordingAsPicture();
+    MyCanvas myCanvas(canvas);
+    myCanvas.drawPicture(picture);
+}
+}  // END FIDDLE