Remove documentation for missing SkiaExamples.

site/user/sample/hello.md

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-Creating a Skia "Hello World!"
-==============================
-
-This tutorial will guide you through the steps to create a Hello World Desktop
-application in Skia.
-
-Who this tutorial is for:
--------------------------
-
-This will be useful to you if you want to create a window that can receive
-events and to which you can draw with Skia.
-
-Step 1: Check out and build Skia
---------------------------------
-
-Follow the instructions for: Linux, Mac OS X or Windows. The framework that we
-will be using does not currently support other platforms.
-
-Once you have a working development environment, we can move on to the next step.
-
-Step 2: Build the included HelloSkia Example
---------------------------------------------
-
-We will be using the "SkiaExamples" framework. You can find it in the
-experimental/SkiaExamples directory. There is an included HelloWorld example,
-and we will start by building it before we go ahead and create our own.
-
-### On Mac OS X
-
-Run `GYP_GENERATORS="ninja" ./gyp_skia`
-This will generate a ninja target, and `ninja -C out/Debug SkiaExamples` will create `SkiaExamples.app`
-
-### On Linux:
-Run `GYP_GENERATORS="ninja" ./gyp_skia`
-
-Build the SkiaExamples target:
-
-    ninja -C out/Release SkiaExamples
-
-The SkiaExamples binary should be in `out/Release/SkiaExamples`
-
-### On Windows
-
-Run `./gyp_skia`
-
-There should be a Visual Studio project `out/gyp/SkiaExamples.vcproj`  with
-which you can build the SkiaExamples binary.
-
-### Run the SkiaExamples.
-
-You should see a window open displaying rotating text and some geometry.
-
-Step 3: Create your own Sample
-------------------------------
-
-Create a file `experimental/SkiaExamples/Tutorial.cpp` within the Skia tree.  Copy the following code:
-
-<!--?prettify lang=cc?-->
-
-~~~~
-#include "SkExample.h"
-#include "SkDevice.h"
-
-class HelloTutorial : public SkExample {
-    public:
-        HelloTutorial(SkExampleWindow* window)
-            : SkExample(window)
-        {
-            fName = "Tutorial";  // This is how Skia will find your example.
-
-            fWindow->setupBackend(SkExampleWindow::kGPU_DeviceType);
-           // Another option is the CPU backend:  fWindow->setupBackend(kRaster_DeviceType);
-        }
-
-    protected:
-        void draw(SkCanvas* canvas) override {
-            // Clear background
-            canvas->drawColor(SK_ColorWHITE);
-
-            SkPaint paint;
-            // Draw a message with a nice black paint.
-            paint.setFlags(SkPaint::kAntiAlias_Flag);
-            paint.setColor(SK_ColorBLACK);
-            paint.setTextSize(SkIntToScalar(20));
-
-            static const char message[] = "Hello World!";
-
-            // Translate and draw the text:
-            canvas->save();
-            canvas->translate(SkIntToScalar(50), SkIntToScalar(100));
-            canvas->drawText(message, strlen(message), SkIntToScalar(0), SkIntToScalar(0), paint);
-            canvas->restore();
-
-            // If you ever want to do animation. Use the inval method to trigger a redraw.
-            this->fWindow->inval(NULL);
-        }
-};
-
-static SkExample* MyFactory(SkExampleWindow* window) {
-    return new HelloTutorial(window);
-}
-static SkExample::Registry registry(MyFactory);
-~~~~
-
-
-Step 4: Compile and run SkiaExamples with your Sample
------------------------------------------------------
-
-Here is what you have to do to compile your example. There will be
-functionality to make this easier, but for now, this is what you have to do:
-
-*   Open `gyp/experimental.gyp` and look for the `SkiaExamples` target.
-
-*   In the 'sources' section of the SkiaExampels target, add
-    `../experimental/SkiaExamples/Tutorial.cpp` to the list of sources.
-
-*   Repeat Step 2 to update our gyp targets and build our example.
-
-*   Run the SkiaExamples, specifying the name of our new example:
-
-        $> out/Release/SkiaExamples --match Tutorial
-
-Step 5: How to iterate through multiple examples
-------------------------------------------------
-
-If you did not specify an example with the `--match` flag, or if your match
-string matches more than one example, you can use the *n* key to iterate
-through all of the examples registered.
-