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/Point_015.cpp b/docs/examples/Point_015.cpp
new file mode 100644
index 0000000..35c4889
--- /dev/null
+++ b/docs/examples/Point_015.cpp
@@ -0,0 +1,23 @@
+// 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=cbe7db206ece825aa3b9b7c3256aeaf0
+REG_FIDDLE(Point_015, 256, 160, false, 0) {
+void draw(SkCanvas* canvas) {
+    SkPaint paint;
+    paint.setAntiAlias(true);
+    const SkPoint points[] = { { 60, -110 }, { 90, 10 }, { 120, -110 }, { 180, -50 } };
+    const SkPoint origin = {0, 0};
+    canvas->translate(30, 140);
+    for (auto point : points) {
+        paint.setStrokeWidth(1);
+        paint.setColor(SK_ColorBLACK);
+        canvas->drawLine(origin, point, paint);
+        SkVector normal = point;
+        normal.setLength(100);
+        paint.setStrokeWidth(10);
+        paint.setColor(0x3f45bf12);
+        canvas->drawLine(origin, normal, paint);
+    }
+}
+}  // END FIDDLE