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/Path_033.cpp b/docs/examples/Path_033.cpp
new file mode 100644
index 0000000..cdc1050
--- /dev/null
+++ b/docs/examples/Path_033.cpp
@@ -0,0 +1,27 @@
+// 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=1ad07d56e4258e041606d50cad969392
+REG_FIDDLE(Path_033, 256, 256, true, 0) {
+void draw(SkCanvas* canvas) {
+    auto debugster = [](const char* prefix, const SkPath& path) -> void {
+        SkPoint line[2];
+        if (path.isLine(line)) {
+            SkDebugf("%s is line (%1.8g,%1.8g) (%1.8g,%1.8g)\n", prefix,
+                 line[0].fX, line[0].fY, line[1].fX, line[1].fY);
+        } else {
+            SkDebugf("%s is not line\n", prefix);
+        }
+    };
+    SkPath path;
+    debugster("empty", path);
+    path.lineTo(0, 0);
+    debugster("zero line", path);
+    path.rewind();
+    path.moveTo(10, 10);
+    path.lineTo(20, 20);
+    debugster("line", path);
+    path.moveTo(20, 20);
+    debugster("second move", path);
+}
+}  // END FIDDLE